Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > uk.tech.broadcast > #70556 > unrolled thread
| Started by | "J. P. Gilliver" <G6JPG@255soft.uk> |
|---|---|
| First post | 2026-09-26 19:08 +0100 |
| Last post | 2026-09-27 13:12 +0200 |
| Articles | 20 on this page of 133 — 23 participants |
Back to article view | Back to uk.tech.broadcast
This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by
below is the oldest one visible, not the original post.
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-26 19:08 +0100
Re: OT - TV Scott <newsgroups@gefion.myzen.co.uk> - 2026-09-26 19:58 +0100
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-26 20:30 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-27 09:39 +0100
Re: OT - TV JMB99 <mb@nospam.net> - 2026-09-28 08:08 +0100
Re: OT - TV Frank Slootweg <this@ddress.is.invalid> - 2026-09-26 19:10 +0000
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-26 21:02 +0100
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-26 21:03 +0100
Re: OT - TV Frank Slootweg <this@ddress.is.invalid> - 2026-09-27 18:20 +0000
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-28 16:26 +0100
Re: OT - TV Frank Slootweg <this@ddress.is.invalid> - 2026-09-28 15:45 +0000
Re: OT - TV Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-09-28 16:30 +0000
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-28 17:46 +0100
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-28 22:25 +0100
Re: OT - TV NY <me@privacy.net> - 2026-09-29 16:40 +0100
OT - Lehrer (was: Re: OT - TV) "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-29 16:58 +0100
Re: OT - Lehrer (was: Re: OT - TV) Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-09-29 18:19 +0000
Re: OT - Lehrer "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-29 20:57 +0100
Re: OT - Lehrer Charles Hope <clh@candehope.me.uk> - 2026-09-29 20:00 +0000
Re: OT - Lehrer (was: Re: OT - TV) André Coutanche <acoutanche@gmx.co.uk> - 2026-09-29 21:50 +0100
Re: OT - Lehrer NY <me@privacy.net> - 2026-09-29 22:33 +0100
Re: OT - Lehrer Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-09-29 22:48 +0000
Re: OT - Lehrer "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-30 01:07 +0100
Re: OT - Lehrer John Ames <commodorejohn@gmail.com> - 2026-09-30 15:51 -0700
Re: OT - Lehrer NY <me@privacy.net> - 2026-10-01 10:57 +0100
Re: OT - Lehrer NY <me@privacy.net> - 2026-09-30 08:10 +0100
Re: OT - Lehrer "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-30 01:39 +0100
Re: OT - Lehrer Roger Blake <rogblake@iname.invalid> - 2026-09-30 00:46 +0000
Re: OT - Lehrer NY <me@privacy.net> - 2026-09-29 22:39 +0100
Re: OT - Lehrer Frank Slootweg <this@ddress.is.invalid> - 2026-09-30 12:25 +0000
Re: OT - Lehrer "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-30 13:34 +0100
Re: OT - Lehrer The Natural Philosopher <tnp@invalid.invalid> - 2026-09-30 14:31 +0100
Re: OT - Lehrer NY <me@privacy.net> - 2026-09-30 14:47 +0100
Re: OT - Lehrer John Williamson <johnwilliamson@btinternet.com> - 2026-09-30 14:58 +0100
Re: OT - Lehrer "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-10-01 02:36 +0100
Re: OT - Lehrer NY <me@privacy.net> - 2026-10-01 11:12 +0100
Re: OT - Lehrer Frank Slootweg <this@ddress.is.invalid> - 2026-10-01 14:35 +0000
Re: OT - Lehrer NY <me@privacy.net> - 2026-10-01 16:14 +0100
Re: OT - Lehrer Frank Slootweg <this@ddress.is.invalid> - 2026-10-01 17:35 +0000
Re: OT - Lehrer Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-10-01 17:53 +0000
Re: OT - Lehrer John Williamson <johnwilliamson@btinternet.com> - 2026-10-01 19:03 +0100
Re: OT - Lehrer "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-10-01 21:50 +0100
Re: OT - Lehrer The Natural Philosopher <tnp@invalid.invalid> - 2026-10-02 12:25 +0100
Re: OT - Lehrer The Natural Philosopher <tnp@invalid.invalid> - 2026-10-01 11:13 +0100
Re: OT - Lehrer NY <me@privacy.net> - 2026-10-01 11:51 +0100
Re: OT - Lehrer John Williamson <johnwilliamson@btinternet.com> - 2026-09-30 14:55 +0100
Re: OT - Lehrer Charles Hope <clh@candehope.me.uk> - 2026-09-30 14:15 +0000
Re: OT - TV Daniel70 <daniel47@nomail.afraid.org> - 2026-09-27 19:58 +1000
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-27 12:52 +0100
Re: OT - TV Daniel70 <daniel47@nomail.afraid.org> - 2026-09-27 22:13 +1000
[OT] - audio distribution, Rediffusion-style (was: Re: OT - TV) "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-28 16:43 +0100
Re: OT - TV Max Demian <max_demian@bigfoot.com> - 2026-09-27 11:44 +0100
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-27 16:12 +0100
Re: OT - TV Max Demian <max_demian@bigfoot.com> - 2026-09-27 18:12 +0100
Re: OT - TV Andy Burns <usenet@andyburns.uk> - 2026-09-27 18:23 +0100
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-27 18:34 +0100
Re: OT - TV Max Demian <max_demian@bigfoot.com> - 2026-09-28 14:03 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-28 15:56 +0100
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-28 16:46 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-28 17:16 +0100
Re: OT - TV Max Demian <max_demian@bigfoot.com> - 2026-09-29 12:01 +0100
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-29 13:05 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-29 13:25 +0100
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-29 14:13 +0100
Re: OT - TV The Other John <nomail@here.org> - 2026-09-29 16:53 +0100
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-29 17:12 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-30 10:22 +0100
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-09-30 13:36 +0100
Re: OT - TV "Carlos E.R." <robin_listas@es.invalid> - 2026-09-30 11:23 +0200
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-30 11:48 +0100
Re: OT - TV Paul <nospam@needed.invalid> - 2026-09-30 07:37 -0400
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-30 14:28 +0100
Re: OT - TV "Carlos E. R." <robin_listas@es.invalid> - 2026-10-01 00:35 +0200
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-10-01 02:15 +0100
Re: OT - TV Paul <nospam@needed.invalid> - 2026-10-01 00:15 -0400
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-10-01 12:50 +0100
Re: OT - TV "Carlos E. R." <robin_listas@es.invalid> - 2026-10-01 14:24 +0200
Re: OT - TV Max Demian <max_demian@bigfoot.com> - 2026-10-01 17:17 +0100
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-10-01 12:48 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-10-01 13:10 +0100
Re: OT - TV John Williamson <johnwilliamson@btinternet.com> - 2026-10-01 13:42 +0100
Re: OT - TV John Williamson <johnwilliamson@btinternet.com> - 2026-10-01 13:32 +0100
Re: OT - TV Frank Slootweg <this@ddress.is.invalid> - 2026-10-01 14:52 +0000
Re: OT - TV Daniel70 <daniel47@nomail.afraid.org> - 2026-10-03 21:10 +1000
Re: OT - TV "Carlos E. R." <robin_listas@es.invalid> - 2026-10-03 13:39 +0200
Re: OT - TV Daniel70 <daniel47@nomail.afraid.org> - 2026-10-04 21:26 +1100
Re: OT - TV "Carlos E. R." <robin_listas@es.invalid> - 2026-10-04 13:19 +0200
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-10-03 12:47 +0100
Re: OT - TV John Williamson <johnwilliamson@btinternet.com> - 2026-10-03 12:50 +0100
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-10-03 13:09 +0100
Re: OT - TV John Williamson <johnwilliamson@btinternet.com> - 2026-10-03 15:59 +0100
Re: OT - TV Jan Panteltje <alien@comet.invalid> - 2026-10-03 15:56 +0000
Re: OT - TV John Williamson <johnwilliamson@btinternet.com> - 2026-10-03 17:19 +0100
Re: OT - TV Jan Panteltje <alien@comet.invalid> - 2026-10-04 10:54 +0000
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-10-03 18:41 +0100
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-10-03 22:52 +0100
Re: OT - TV Paul <nospam@needed.invalid> - 2026-10-03 21:24 -0400
Re: OT - TV Jan Panteltje <alien@comet.invalid> - 2026-10-04 08:08 +0000
Re: OT - TV John Williamson <johnwilliamson@btinternet.com> - 2026-10-04 09:29 +0100
Re: OT - TV Roderick Stewart <rjfs@escapetime.myzen.co.uk> - 2026-09-30 15:13 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-29 13:16 +0100
Re: OT - TV Jan Panteltje <alien@comet.invalid> - 2026-09-29 15:54 +0000
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-29 17:15 +0100
Re: OT - TV "Carlos E.R." <robin_listas@es.invalid> - 2026-09-30 11:27 +0200
Re: OT - TV John Williamson <johnwilliamson@btinternet.com> - 2026-09-30 11:13 +0100
Re: OT - TV John Williamson <johnwilliamson@btinternet.com> - 2026-09-30 11:19 +0100
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-30 11:57 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-30 13:29 +0100
Re: OT - TV John Williamson <johnwilliamson@btinternet.com> - 2026-09-30 13:54 +0100
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-30 14:34 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-30 18:08 +0100
Re: OT - TV "J. P. Gilliver" <G6JPG@255soft.uk> - 2026-10-01 02:22 +0100
Re: OT - TV Jan Panteltje <alien@comet.invalid> - 2026-10-01 06:37 +0000
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-10-01 10:32 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-10-01 09:41 +0100
Re: OT - TV "Carlos E. R." <robin_listas@es.invalid> - 2026-10-01 00:37 +0200
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-09-30 11:50 +0100
Re: OT - TV Jan Panteltje <alien@comet.invalid> - 2026-09-30 13:08 +0000
Re: OT - TV "Carlos E. R." <robin_listas@es.invalid> - 2026-10-01 00:50 +0200
Re: OT - TV Jan Panteltje <alien@comet.invalid> - 2026-10-01 06:12 +0000
Re: OT - TV c186282 <c186282@nnada.net> - 2026-10-01 03:29 -0400
Re: OT - TV "Carlos E. R." <robin_listas@es.invalid> - 2026-10-01 14:53 +0200
Re: OT - TV Paul <nospam@needed.invalid> - 2026-10-01 03:32 -0400
Re: OT - TV "Carlos E. R." <robin_listas@es.invalid> - 2026-10-01 14:49 +0200
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-10-01 12:57 +0100
Re: OT - TV liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-10-01 13:27 +0100
Re: OT - TV "Carlos E. R." <robin_listas@es.invalid> - 2026-10-01 15:19 +0200
Re: OT - TV Jan Panteltje <alien@comet.invalid> - 2026-10-01 14:34 +0000
Re: OT - TV The Natural Philosopher <tnp@invalid.invalid> - 2026-10-01 15:51 +0100
Re: OT - TV Jan Panteltje <alien@comet.invalid> - 2026-10-02 06:52 +0000
Re: OT - TV Andy Burns <usenet@andyburns.uk> - 2026-10-04 07:52 +0100
Re: OT - TV c186282 <c186282@nnada.net> - 2026-10-04 03:15 -0400
Re: OT - TV "Carlos E.R." <robin_listas@es.invalid> - 2026-09-27 13:12 +0200
Page 5 of 7 — ← Prev page 1 2 3 4 [5] 6 7 Next page →
| From | John Williamson <johnwilliamson@btinternet.com> |
|---|---|
| Date | 2026-10-01 13:42 +0100 |
| Message-ID | <ni72pdFs3m5U1@mid.individual.net> |
| In reply to | #70665 |
On 01/10/2026 13:10, Liz Tuddenham wrote: > The Natural Philosopher <tnp@invalid.invalid> wrote: > >> On 30/09/2026 23:35, Carlos E. R. wrote: >>> On 2026-09-30 15:28, The Natural Philosopher wrote: >>>> On 30/09/2026 12:37, Paul wrote: >>>>> On Wed, 9/30/2026 5:23 AM, Carlos E.R. wrote: >>> >>> >>>> Automotive is 13.8V rated and that/s it. The alternators wont go >>>> higher. Which is why you use bridged amps >>> >>> I have seen 15 volts. >>> >>> >> The absolute max is supposed to be 14,4 > > That's the generally-accepted stabilised voltage for not over-charging > the battery but fast chargers and dynamo-driven systems can often exceed > that. Loose battery terminals can cause the regulator to overshoot and > inductive loads can generate very large spikes with a lot of stored > energy. > > For boats, we are now using Lithium Iron Phosphate batteries, which unlike lead acid, will accept the full charge current until the battery management system disconnects the charge source to avoid damaging the cells. This sudden disconnection causes the windings in the alternator to generate a spike which can easily destroy the rectifier diodes and regulator electronics. The spike contains tens of joules of energy, so can reach over 100 Volts depending on the other loads. For this reason, we always connect a lead acid battery to the alternator and use a DC-DC converter to charge the PiFePO4 batteries. -- Tciao for Now! John.
[toc] | [prev] | [next] | [standalone]
| From | John Williamson <johnwilliamson@btinternet.com> |
|---|---|
| Date | 2026-10-01 13:32 +0100 |
| Message-ID | <ni7271Fs13aU1@mid.individual.net> |
| In reply to | #70644 |
On 30/09/2026 23:35, Carlos E. R. wrote: > On 2026-09-30 15:28, The Natural Philosopher wrote: >> On 30/09/2026 12:37, Paul wrote: >>> On Wed, 9/30/2026 5:23 AM, Carlos E.R. wrote: > > >> Automotive is 13.8V rated and that/s it. The alternators wont go >> higher. Which is why you use bridged amps > > I have seen 15 volts. > > Both the alternators I currently have in use go to 14.5 volts, as did the dynamo on the Land Rover.. All amps for Auto use are rated for slightly more than the alternator voltage for safety, and for really high power, require very low speaker impedances. The one on my boat is rated for full power into a 1 ohm load. -- Tciao for Now! John.
[toc] | [prev] | [next] | [standalone]
| From | Frank Slootweg <this@ddress.is.invalid> |
|---|---|
| Date | 2026-10-01 14:52 +0000 |
| Message-ID | <119m338.o7c.1@ID-201911.user.individual.net> |
| In reply to | #70644 |
Carlos E. R. <robin_listas@es.invalid> wrote: > On 2026-09-30 15:28, The Natural Philosopher wrote: > > On 30/09/2026 12:37, Paul wrote: > >> On Wed, 9/30/2026 5:23 AM, Carlos E.R. wrote: > > > > Automotive is 13.8V rated and that/s it. The alternators wont go > > higher. Which is why you use bridged amps > > I have seen 15 volts. Yes, I see that as well, or values very close to 15V. The battery tester [1] I have, has a 'Good' range from 13.4-14.8V (with the engine running, i.e. the alternator providing power). [1] A simple one, plugged into the 'cigarette lighter' socket.
[toc] | [prev] | [next] | [standalone]
| From | Daniel70 <daniel47@nomail.afraid.org> |
|---|---|
| Date | 2026-10-03 21:10 +1000 |
| Message-ID | <119qnr6$2urls$1@dont-email.me> |
| In reply to | #70676 |
On 2/10/2026 12:52 am, Frank Slootweg wrote: > Carlos E. R. <robin_listas@es.invalid> wrote: >> On 2026-09-30 15:28, The Natural Philosopher wrote: >>> On 30/09/2026 12:37, Paul wrote: >>>> On Wed, 9/30/2026 5:23 AM, Carlos E.R. wrote: >> >>> Automotive is 13.8V rated and that/s it. The alternators wont go >>> higher. Which is why you use bridged amps >> >> I have seen 15 volts. > > Yes, I see that as well, or values very close to 15V. > > The battery tester [1] I have, has a 'Good' range from 13.4-14.8V > (with the engine running, i.e. the alternator providing power). > > [1] A simple one, plugged into the 'cigarette lighter' socket. > (Not being very mechanically minded, myself but) I've thought for a long, long time that Battery Cells were 2.2Volts each so the six cells in a Car Battery gives 13.2Volts. When recharging a Battery, you want to apply a slightly higher Voltage ... (as the Battery will pull the charger Voltage down) so 13.4Volts up to about 14Volts would probably do the job well enough, although charging the Battery may take a while longer. 15Volts might cook the Battery. -- Daniel70
[toc] | [prev] | [next] | [standalone]
| From | "Carlos E. R." <robin_listas@es.invalid> |
|---|---|
| Date | 2026-10-03 13:39 +0200 |
| Message-ID | <nic7s4Fk2g3U3@mid.individual.net> |
| In reply to | #70693 |
On 2026-10-03 13:10, Daniel70 wrote:
> On 2/10/2026 12:52 am, Frank Slootweg wrote:
>> Carlos E. R. <robin_listas@es.invalid> wrote:
>>> On 2026-09-30 15:28, The Natural Philosopher wrote:
>>>> On 30/09/2026 12:37, Paul wrote:
>>>>> On Wed, 9/30/2026 5:23 AM, Carlos E.R. wrote:
>>>
>>>> Automotive is 13.8V rated and that/s it. The alternators wont go
>>>> higher. Which is why you use bridged amps
>>>
>>> I have seen 15 volts.
>>
>> Yes, I see that as well, or values very close to 15V.
>>
>> The battery tester [1] I have, has a 'Good' range from 13.4-14.8V
>> (with the engine running, i.e. the alternator providing power).
>>
>> [1] A simple one, plugged into the 'cigarette lighter' socket.
>>
> (Not being very mechanically minded, myself but) I've thought for a
> long, long time that Battery Cells were 2.2Volts each so the six cells
> in a Car Battery gives 13.2Volts.
>
> When recharging a Battery, you want to apply a slightly higher
> Voltage ... (as the Battery will pull the charger Voltage down) so
> 13.4Volts up to about 14Volts would probably do the job well enough,
> although charging the Battery may take a while longer.
>
> 15Volts might cook the Battery.
They use voltages going to 30 volts to fast charge a battery. I'm not
sure of the exact figures, but I saw them once in the wikipedia.
--
Cheers,
Carlos E.R.
ES🇪🇸, EU🇪🇺.
[toc] | [prev] | [next] | [standalone]
| From | Daniel70 <daniel47@nomail.afraid.org> |
|---|---|
| Date | 2026-10-04 21:26 +1100 |
| Message-ID | <119t9la$3qbm4$1@dont-email.me> |
| In reply to | #70694 |
On 3/10/2026 9:39 pm, Carlos E. R. wrote: > On 2026-10-03 13:10, Daniel70 wrote: >> On 2/10/2026 12:52 am, Frank Slootweg wrote: >>> Carlos E. R. <robin_listas@es.invalid> wrote: >>>> On 2026-09-30 15:28, The Natural Philosopher wrote: >>>>> On 30/09/2026 12:37, Paul wrote: >>>>>> On Wed, 9/30/2026 5:23 AM, Carlos E.R. wrote: >>>> >>>>> Automotive is 13.8V rated and that/s it. The alternators wont go >>>>> higher. Which is why you use bridged amps >>>> >>>> I have seen 15 volts. >>> >>> Yes, I see that as well, or values very close to 15V. >>> >>> The battery tester [1] I have, has a 'Good' range from 13.4-14.8V >>> (with the engine running, i.e. the alternator providing power). >>> >>> [1] A simple one, plugged into the 'cigarette lighter' socket. >>> >> (Not being very mechanically minded, myself but) I've thought for a >> long, long time that Battery Cells were 2.2Volts each so the six cells >> in a Car Battery gives 13.2Volts. >> >> When recharging a Battery, you want to apply a slightly higher Voltage >> ... (as the Battery will pull the charger Voltage down) so 13.4Volts >> up to about 14Volts would probably do the job well enough, although >> charging the Battery may take a while longer. >> >> 15Volts might cook the Battery. > > They use voltages going to 30 volts to fast charge a battery. I'm not > sure of the exact figures, but I saw them once in the wikipedia. > Is that for Lead/Acid Car Batteries or for one or other of the newer variants?? -- Daniel70
[toc] | [prev] | [next] | [standalone]
| From | "Carlos E. R." <robin_listas@es.invalid> |
|---|---|
| Date | 2026-10-04 13:19 +0200 |
| Message-ID | <nier1eF1topU7@mid.individual.net> |
| In reply to | #70711 |
On 2026-10-04 12:26, Daniel70 wrote:
> On 3/10/2026 9:39 pm, Carlos E. R. wrote:
>> On 2026-10-03 13:10, Daniel70 wrote:
>>> On 2/10/2026 12:52 am, Frank Slootweg wrote:
>>>> Carlos E. R. <robin_listas@es.invalid> wrote:
>>>>> On 2026-09-30 15:28, The Natural Philosopher wrote:
>>>>>> On 30/09/2026 12:37, Paul wrote:
>>>>>>> On Wed, 9/30/2026 5:23 AM, Carlos E.R. wrote:
>>>>>
>>>>>> Automotive is 13.8V rated and that/s it. The alternators wont go
>>>>>> higher. Which is why you use bridged amps
>>>>>
>>>>> I have seen 15 volts.
>>>>
>>>> Yes, I see that as well, or values very close to 15V.
>>>>
>>>> The battery tester [1] I have, has a 'Good' range from 13.4-14.8V
>>>> (with the engine running, i.e. the alternator providing power).
>>>>
>>>> [1] A simple one, plugged into the 'cigarette lighter' socket.
>>>>
>>> (Not being very mechanically minded, myself but) I've thought for a
>>> long, long time that Battery Cells were 2.2Volts each so the six
>>> cells in a Car Battery gives 13.2Volts.
>>>
>>> When recharging a Battery, you want to apply a slightly higher
>>> Voltage ... (as the Battery will pull the charger Voltage down) so
>>> 13.4Volts up to about 14Volts would probably do the job well enough,
>>> although charging the Battery may take a while longer.
>>>
>>> 15Volts might cook the Battery.
>>
>> They use voltages going to 30 volts to fast charge a battery. I'm not
>> sure of the exact figures, but I saw them once in the wikipedia.
>>
> Is that for Lead/Acid Car Batteries or for one or other of the newer
> variants??
Standard lead-acid, maybe gel variants. Chargers designed for
professionals, mounted on carts or trolleys.
To inject more amps in the battery, you need higher voltage. So rise the
voltage as much as needed, under a controller, to inject 50 amps (I
don't know the actual figure).
These things have instructions to disconnect the battery from the car
before starting, to avoid damage to the car electronics.
--
Cheers,
Carlos E.R.
ES🇪🇸, EU🇪🇺.
[toc] | [prev] | [next] | [standalone]
| From | The Natural Philosopher <tnp@invalid.invalid> |
|---|---|
| Date | 2026-10-03 12:47 +0100 |
| Message-ID | <119qq1d$2vglb$1@dont-email.me> |
| In reply to | #70693 |
On 03/10/2026 12:10, Daniel70 wrote: > (Not being very mechanically minded, myself but) I've thought for a > long, long time that Battery Cells were 2.2Volts each so the six cells > in a Car Battery gives 13.2Volts. > Nominal *fully charged* voltage is 13.4V, I think charging voltage is generally around 14.4V > When recharging a Battery, you want to apply a slightly higher Voltage > ... (as the Battery will pull the charger Voltage down) so 13.4Volts up > to about 14Volts would probably do the job well enough, although > charging the Battery may take a while longer. > > 15Volts might cook the Battery. Its unlikely that the alternator could supply enough current to raise it that high -- “Politics is the art of looking for trouble, finding it everywhere, diagnosing it incorrectly and applying the wrong remedies.” ― Groucho Marx
[toc] | [prev] | [next] | [standalone]
| From | John Williamson <johnwilliamson@btinternet.com> |
|---|---|
| Date | 2026-10-03 12:50 +0100 |
| Message-ID | <nic8gsFlgotU1@mid.individual.net> |
| In reply to | #70693 |
On 03/10/2026 12:10, Daniel70 wrote: > On 2/10/2026 12:52 am, Frank Slootweg wrote: >> Carlos E. R. <robin_listas@es.invalid> wrote: >>> On 2026-09-30 15:28, The Natural Philosopher wrote: >>>> On 30/09/2026 12:37, Paul wrote: >>>>> On Wed, 9/30/2026 5:23 AM, Carlos E.R. wrote: >>> >>>> Automotive is 13.8V rated and that/s it. The alternators wont go >>>> higher. Which is why you use bridged amps >>> >>> I have seen 15 volts. >> >> Yes, I see that as well, or values very close to 15V. >> >> The battery tester [1] I have, has a 'Good' range from 13.4-14.8V >> (with the engine running, i.e. the alternator providing power). >> >> [1] A simple one, plugged into the 'cigarette lighter' socket. >> > (Not being very mechanically minded, myself but) I've thought for a > long, long time that Battery Cells were 2.2Volts each so the six cells > in a Car Battery gives 13.2Volts. > The voltage of a lead acid cell varies between 1.93 volts when flat and 2.11 volts when fully charged. It can rise to 2.33 volts while on charge. This translates to the voltage at the lighter socket being anywhere between 11.8 and 14.4 Volts. When the engine is running, it normally will be about 14.4 volts. 13.2 volts is a safe voltage to hold the battery at while on float charge. (The battery is being used as a backup supply in case of mains failure.) > When recharging a Battery, you want to apply a slightly higher Voltage > ... (as the Battery will pull the charger Voltage down) so 13.4Volts up > to about 14Volts would probably do the job well enough, although > charging the Battery may take a while longer. > > 15Volts might cook the Battery. On occasion, 15 Volt or slightly more can be used ro equalise the charge between the cells, but this will cause some of the water in the electrolyte to split into hydrogen and oxygen. -- Tciao for Now! John.
[toc] | [prev] | [next] | [standalone]
| From | The Natural Philosopher <tnp@invalid.invalid> |
|---|---|
| Date | 2026-10-03 13:09 +0100 |
| Message-ID | <119qr92$2vglb$2@dont-email.me> |
| In reply to | #70696 |
On 03/10/2026 12:50, John Williamson wrote: > On occasion, 15 Volt or slightly more can be used ro equalise the charge > between the cells, but this will cause some of the water in the > electrolyte to split into hydrogen and oxygen. And some of the cells to split into plastic, lead, acid and a loud bang DAMHIKT... -- “The urge to save humanity is almost always only a false face for the urge to rule it.” – H. L. Mencken
[toc] | [prev] | [next] | [standalone]
| From | John Williamson <johnwilliamson@btinternet.com> |
|---|---|
| Date | 2026-10-03 15:59 +0100 |
| Message-ID | <nicjicFn3jhU1@mid.individual.net> |
| In reply to | #70697 |
On 03/10/2026 13:09, The Natural Philosopher wrote: > On 03/10/2026 12:50, John Williamson wrote: >> On occasion, 15 Volt or slightly more can be used ro equalise the >> charge between the cells, but this will cause some of the water in the >> electrolyte to split into hydrogen and oxygen. > And some of the cells to split into plastic, lead, acid and a loud bang > DAMHIKT... That needs a spark nearby -- Tciao for Now! John.
[toc] | [prev] | [next] | [standalone]
| From | Jan Panteltje <alien@comet.invalid> |
|---|---|
| Date | 2026-10-03 15:56 +0000 |
| Message-ID | <119r8k4$3515t$1@dont-email.me> |
| In reply to | #70699 |
>John Williamson <johnwilliamson@btinternet.com>wrote: >>On 03/10/2026 13:09, The Natural Philosopher wrote: >> On 03/10/2026 12:50, John Williamson wrote: >>> On occasion, 15 Volt or slightly more can be used ro equalise the >>> charge between the cells, but this will cause some of the water in the >>> electrolyte to split into hydrogen and oxygen. >> And some of the cells to split into plastic, lead, acid and a loud bang >> DAMHIKT... > >That needs a spark nearby I was just charging a lead acid battery (from a UPS) with my lab supply: https://ibb.co/j9hGGcNB You can set voltage and current-limit anyway you want Very useful thing, designed and build it around 2010: https://panteltje.nl/panteltje/pic/pwr_pic/ You can charge all sort of batteries with it. 12 V in from a big wallwart (from mains) 0 to 24 V adjustable output.
[toc] | [prev] | [next] | [standalone]
| From | John Williamson <johnwilliamson@btinternet.com> |
|---|---|
| Date | 2026-10-03 17:19 +0100 |
| Message-ID | <nico85FnpicU1@mid.individual.net> |
| In reply to | #70700 |
On 03/10/2026 16:56, Jan Panteltje wrote: >> John Williamson <johnwilliamson@btinternet.com>wrote: >>> On 03/10/2026 13:09, The Natural Philosopher wrote: >>> On 03/10/2026 12:50, John Williamson wrote: >>>> On occasion, 15 Volt or slightly more can be used ro equalise the >>>> charge between the cells, but this will cause some of the water in the >>>> electrolyte to split into hydrogen and oxygen. >>> And some of the cells to split into plastic, lead, acid and a loud bang >>> DAMHIKT... >> >> That needs a spark nearby > > I was just charging a lead acid battery (from a UPS) with my lab supply: > https://ibb.co/j9hGGcNB > > You can set voltage and current-limit anyway you want > > Very useful thing, designed and build it around 2010: > https://panteltje.nl/panteltje/pic/pwr_pic/ > > You can charge all sort of batteries with it. > 12 V in from a big wallwart (from mains) 0 to 24 V adjustable output. > I use 12 volts at home to power all sorts of things, and for many years, I used lead acid batteries. I now use Lithium Iron Phosphate batteries. (I live on a boat) The batteries get changed by solar power, the engine alternator or a mains powered charger. I have a number of DC-DC converters to power laptops and such and an inverter which can power a microwave or power tools. -- Tciao for Now! John.
[toc] | [prev] | [next] | [standalone]
| From | Jan Panteltje <alien@comet.invalid> |
|---|---|
| Date | 2026-10-04 10:54 +0000 |
| Message-ID | <119tba1$3quvc$1@dont-email.me> |
| In reply to | #70701 |
>John Williamson <johnwilliamson@btinternet.com>wrote: >>On 03/10/2026 16:56, Jan Panteltje wrote: >>> John Williamson <johnwilliamson@btinternet.com>wrote: >>>> On 03/10/2026 13:09, The Natural Philosopher wrote: >>>> On 03/10/2026 12:50, John Williamson wrote: >>>>> On occasion, 15 Volt or slightly more can be used ro equalise the >>>>> charge between the cells, but this will cause some of the water in the >>>>> electrolyte to split into hydrogen and oxygen. >>>> And some of the cells to split into plastic, lead, acid and a loud bang >>>> DAMHIKT... >>> >>> That needs a spark nearby >> >> I was just charging a lead acid battery (from a UPS) with my lab supply: >> https://ibb.co/j9hGGcNB >> >> You can set voltage and current-limit anyway you want >> >> Very useful thing, designed and build it around 2010: >> https://panteltje.nl/panteltje/pic/pwr_pic/ >> >> You can charge all sort of batteries with it. >> 12 V in from a big wallwart (from mains) 0 to 24 V adjustable output. >> >I use 12 volts at home to power all sorts of things, and for many years, >I used lead acid batteries. I now use Lithium Iron Phosphate batteries. >(I live on a boat) The batteries get changed by solar power, the engine >alternator or a mains powered charger. I have a number of DC-DC >converters to power laptops and such and an inverter which can power a >microwave or power tools. I have these for on a boat: 250_Ah_12V_to_230V_sinewave_IXXIMG_0796.JPG Now in use as backup for my computers, as the UPS battery gave up after constantly coming in since the power company changed their meter for a 'smart' one and removed the connection of neutral to local ground, causing a voltage drop. So much for improvement, now you pay more for their cable losses?? That battery pack runs microwave and fridge too if needed I have 3 large flexible solar panels for on a boat. And a small fixed 80 W one upstair in a window. Several solar powered flashights too, some with hand crank.
[toc] | [prev] | [next] | [standalone]
| From | The Natural Philosopher <tnp@invalid.invalid> |
|---|---|
| Date | 2026-10-03 18:41 +0100 |
| Message-ID | <119reoe$37dqq$1@dont-email.me> |
| In reply to | #70699 |
On 03/10/2026 15:59, John Williamson wrote: > On 03/10/2026 13:09, The Natural Philosopher wrote: >> On 03/10/2026 12:50, John Williamson wrote: >>> On occasion, 15 Volt or slightly more can be used ro equalise the >>> charge between the cells, but this will cause some of the water in the >>> electrolyte to split into hydrogen and oxygen. >> And some of the cells to split into plastic, lead, acid and a loud bang >> DAMHIKT... > > That needs a spark nearby > Yes. Removing the battery charger was plenty. -- Microsoft : the best reason to go to Linux that ever existed.
[toc] | [prev] | [next] | [standalone]
| From | "J. P. Gilliver" <G6JPG@255soft.uk> |
|---|---|
| Date | 2026-10-03 22:52 +0100 |
| Message-ID | <119rtfl$3cufj$1@dont-email.me> |
| In reply to | #70696 |
On 2026/10/3 12:50:51, John Williamson wrote: [] > On occasion, 15 Volt or slightly more can be used ro equalise the charge > between the cells, but this will cause some of the water in the > electrolyte to split into hydrogen and oxygen. > > Which won't recombine (except explosively), so reducing the amount of electrolyte in the gassing cell, so reducing the capacity - which will thus cause that cell to be the first to start gassing next time, i. e. (slow) positive feedback. Whether this can be remedied by topping up the affected cell(s), I do not know. -- J. P. Gilliver. UMRA: 1960/<1985 MB++G()ALIS-Ch++(p)Ar++T+H+Sh0!:`)DNAf
[toc] | [prev] | [next] | [standalone]
| From | Paul <nospam@needed.invalid> |
|---|---|
| Date | 2026-10-03 21:24 -0400 |
| Message-ID | <119s9s8$3gl64$1@dont-email.me> |
| In reply to | #70703 |
On Sat, 10/3/2026 5:52 PM, J. P. Gilliver wrote: > On 2026/10/3 12:50:51, John Williamson wrote: > [] >> On occasion, 15 Volt or slightly more can be used ro equalise the charge >> between the cells, but this will cause some of the water in the >> electrolyte to split into hydrogen and oxygen. >> >> > Which won't recombine (except explosively), so reducing the amount of > electrolyte in the gassing cell, so reducing the capacity - which will > thus cause that cell to be the first to start gassing next time, i. e. > (slow) positive feedback. Whether this can be remedied by topping up the > affected cell(s), I do not know. > "The Basic Chemistry of Gas Recombination in Lead-Acid Batteries" https://www.tms.org/pubs/journals/jom/0101/nelson-0101.html It appears the process takes care of the oxygen. Paul
[toc] | [prev] | [next] | [standalone]
| From | Jan Panteltje <alien@comet.invalid> |
|---|---|
| Date | 2026-10-04 08:08 +0000 |
| Message-ID | <119t1ip$3nfmp$1@dont-email.me> |
| In reply to | #70704 |
>Paul <nospam@needed.invalid>wrote: >>On Sat, 10/3/2026 5:52 PM, J. P. Gilliver wrote: >> On 2026/10/3 12:50:51, John Williamson wrote: >> [] >>> On occasion, 15 Volt or slightly more can be used ro equalise the charge >>> between the cells, but this will cause some of the water in the >>> electrolyte to split into hydrogen and oxygen. >>> >>> >> Which won't recombine (except explosively), so reducing the amount of >> electrolyte in the gassing cell, so reducing the capacity - which will >> thus cause that cell to be the first to start gassing next time, i. e. >> (slow) positive feedback. Whether this can be remedied by topping up the >> affected cell(s), I do not know. >> > >"The Basic Chemistry of Gas Recombination in Lead-Acid Batteries" > > https://www.tms.org/pubs/journals/jom/0101/nelson-0101.html > >It appears the process takes care of the oxygen. > > Paul Thank you, nice link!
[toc] | [prev] | [next] | [standalone]
| From | John Williamson <johnwilliamson@btinternet.com> |
|---|---|
| Date | 2026-10-04 09:29 +0100 |
| Message-ID | <nieh2gF1e64U1@mid.individual.net> |
| In reply to | #70703 |
On 03/10/2026 22:52, J. P. Gilliver wrote: > On 2026/10/3 12:50:51, John Williamson wrote: > [] >> On occasion, 15 Volt or slightly more can be used ro equalise the charge >> between the cells, but this will cause some of the water in the >> electrolyte to split into hydrogen and oxygen. >> >> > Which won't recombine (except explosively), so reducing the amount of > electrolyte in the gassing cell, so reducing the capacity - which will > thus cause that cell to be the first to start gassing next time, i. e. > (slow) positive feedback. Whether this can be remedied by topping up the > affected cell(s), I do not know. > Some batteries have plugs with a catalyst which partially recombine the two into water, but mostly, we just add pure water (Distilled or de-ionised) after equalisation. For some applications such as electric vehicles, this is automated. These batteries can last much longer than sealed cells. Lead acid batteries are not maintenance free, except in the limited sense that sealed cells with a catalytic cap can outlast the warranty period by a small margin with suitably controlled charging. Eventually, though, the lead in all lead acid batteries gets sulphated by the acid and needs to be reprocessed no matter what you do. -- Tciao for Now! John.
[toc] | [prev] | [next] | [standalone]
| From | Roderick Stewart <rjfs@escapetime.myzen.co.uk> |
|---|---|
| Date | 2026-09-30 15:13 +0100 |
| Message-ID | <iv5qbltcnrg3t63mdjnbqdlrmn4vmrvorr@4ax.com> |
| In reply to | #70620 |
On Wed, 30 Sep 2026 11:23:21 +0200, "Carlos E.R." <robin_listas@es.invalid> wrote: >> Its NOT juts a matter of impedance - its a matter of DC bias. You cannot >> build a >> valve amplifier that delivers true AC without an isolation transformer. >> Loudspeakers don't like DC bias > >That's true also for transistors, and we don't normally use >transformers. We use capacitors. You don't need an isolating capacitor in the output of a transistor amplifier if it has a +/- power supply so that the output voltage has a DC component of zero. You still need big capacitors, but audio isn't going through them because they're smoothing the DC supply instead. Rod.
[toc] | [prev] | [next] | [standalone]
Page 5 of 7 — ← Prev page 1 2 3 4 [5] 6 7 Next page →
Back to top | Article view | uk.tech.broadcast
csiph-web