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Groups > sci.electronics.design > #748254
| From | Jeroen Belleman <jeroen@nospam.please> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: Random noise generation |
| Date | 2026-09-26 23:09 +0200 |
| Organization | A noiseless patient Spider |
| Message-ID | <1199cat$psc7$3@dont-email.me> (permalink) |
| References | (17 earlier) <1s1zj3s.1u3fl60cacq2oN%liz@poppyrecords.invalid.invalid> <bk2dblp2o2c4gn1da6r5jnpmep4pdvjpi0@4ax.com> <1s20ih4.9s3ibycd8ilkN%liz@poppyrecords.invalid.invalid> <1197usr$9tbq$2@dont-email.me> <1s21p25.du6ev31qi92xqN%liz@poppyrecords.invalid.invalid> |
On 9/26/26 15:37, Liz Tuddenham wrote: > Jeroen Belleman <jeroen@nospam.please> wrote: > >> On 9/25/26 23:12, Liz Tuddenham wrote: >>> john larkin <jl@glen--canyon.com> wrote: >>> >>>> On Fri, 25 Sep 2026 09:22:46 +0100, liz@poppyrecords.invalid.invalid >>>> (Liz Tuddenham) wrote: >>> [...] >>>>> For a rough-and-ready audio noise generator, I used the noise of the >>>>> blue LED pilot light and amplified it with a quad op-amp. i also >>>>> included a state-variable filter so you could select: >>>>> >>>>> Full bandwidth >>>>> High pass >>>>> Low pass >>>>> Narrow peak >>>>> Narrow notch >>>> >>>> Was the led forward biased? >>> >>> Yes, it was used as the pilot light. >>> >>> >>> >What was its noise amplitude? >>> >>> The total voltage gain was about 10^5 to give a 0dBm output, so the >>> noise was around -100dBu. >>> >> >> That should be -100dBm, surely? > > No, that was the (near) open-circuit voltage but it wasn't delivering > that voltage into a 600-ohm load, so that is no indication of the power > (which is what dBm measures). A voltage level of -100 dBu would only be > equivelent to -100dBm if the circuit impedance were 600 0hms. > > I see. I wasn't familiar with dBu. With a little effort, I think I could probably collect over a hundred dBxx units in use in one place or another. I use only a few. Jeroen Belleman
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proposal Lane W <cactus_DAC@yahoo.com> - 2026-09-20 14:27 -0600
Re: proposal john larkin <jl@glen--canyon.com> - 2026-09-20 13:49 -0700
Re: proposal Lasse Langwadt <llc@fonz.dk> - 2026-09-20 23:20 +0200
Re: proposal john larkin <jl@glen--canyon.com> - 2026-09-20 14:35 -0700
Re: proposal Lasse Langwadt <llc@fonz.dk> - 2026-09-21 20:11 +0200
Re: proposal Martin Brown <'''newspam'''@nonad.co.uk> - 2026-09-20 22:46 +0100
Re: proposal Don Y <blockedofcourse@foo.invalid> - 2026-09-20 14:56 -0700
Re: proposal Lane W <cactus_DAC@yahoo.com> - 2026-09-20 17:08 -0600
Re: proposal john larkin <jl@glen--canyon.com> - 2026-09-20 19:11 -0700
Re: proposal Don Y <blockedofcourse@foo.invalid> - 2026-09-20 19:24 -0700
Re: proposal Don Y <blockedofcourse@foo.invalid> - 2026-09-20 19:36 -0700
Re: proposal Sergey Kubushyn <ksi@koi8.net> - 2026-09-21 03:27 +0000
Re: proposal Don Y <blockedofcourse@foo.invalid> - 2026-09-20 21:01 -0700
Re: proposal Jan Panteltje <alien@comet.invalid> - 2026-09-21 06:36 +0000
Re: proposal Sergey Kubushyn <ksi@koi8.net> - 2026-09-21 07:02 +0000
Re: proposal Jan Panteltje <alien@comet.invalid> - 2026-09-21 07:34 +0000
Re: proposal Don Y <blockedofcourse@foo.invalid> - 2026-09-21 01:26 -0700
Re: proposal Bill Sloman <bill.sloman@ieee.org> - 2026-09-21 17:06 +1000
Re: proposal Don Y <blockedofcourse@foo.invalid> - 2026-09-20 14:57 -0700
Re: proposal sobriquet <dohduhdah@yahoo.com> - 2026-09-21 03:10 +0200
Re: proposal Lane W <cactus_DAC@yahoo.com> - 2026-09-20 20:38 -0600
Re: proposal Jan Panteltje <alien@comet.invalid> - 2026-09-21 06:45 +0000
Re: proposal john larkin <jl@glen--canyon.com> - 2026-09-21 09:26 -0700
Re: proposal Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-09-22 00:36 +0800
Re: proposal john larkin <jl@htigct.com> - 2026-09-21 10:20 -0700
Re: proposal Bill Sloman <bill.sloman@ieee.org> - 2026-09-22 16:30 +1000
Re: proposal Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-09-22 14:45 +0800
Re: proposal Bill Sloman <bill.sloman@ieee.org> - 2026-09-22 17:17 +1000
Re: proposal john larkin <jl@glen--canyon.com> - 2026-09-22 04:01 -0700
Re: proposal Bill Sloman <bill.sloman@ieee.org> - 2026-09-23 00:21 +1000
Re: proposal sobriquet <dohduhdah@yahoo.com> - 2026-09-22 02:32 +0200
Re: proposal john larkin <jl@glen--canyon.com> - 2026-09-21 19:03 -0700
Re: proposal sobriquet <dohduhdah@yahoo.com> - 2026-09-22 04:09 +0200
Re: proposal john larkin <jl@glen--canyon.com> - 2026-09-21 20:23 -0700
Re: proposal sobriquet <dohduhdah@yahoo.com> - 2026-09-22 06:10 +0200
Re: proposal Bill Sloman <bill.sloman@ieee.org> - 2026-09-22 16:57 +1000
Re: proposal john larkin <jl@glen--canyon.com> - 2026-09-22 04:15 -0700
Re: proposal Bill Sloman <bill.sloman@ieee.org> - 2026-09-23 00:38 +1000
Re: proposal john larkin <jl@glen--canyon.com> - 2026-09-22 08:08 -0700
Re: proposal Bill Sloman <bill.sloman@ieee.org> - 2026-09-23 01:49 +1000
Re: proposal Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-09-23 00:04 +0800
Re: proposal Bill Sloman <bill.sloman@ieee.org> - 2026-09-24 18:27 +1000
Re: proposal Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-09-24 17:07 +0800
Re: proposal Bill Sloman <bill.sloman@ieee.org> - 2026-09-25 01:41 +1000
Re: proposal Lane W <cactus_DAC@yahoo.com> - 2026-09-24 10:02 -0600
Re: proposal Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-09-25 04:00 +0800
Re: proposal Bill Sloman <bill.sloman@ieee.org> - 2026-09-25 16:37 +1000
Re: proposal john larkin <jl@glen--canyon.com> - 2026-09-22 04:04 -0700
Re: proposal sobriquet <dohduhdah@yahoo.com> - 2026-09-22 16:38 +0200
Re: proposal john larkin <jl@glen--canyon.com> - 2026-09-22 08:22 -0700
Re: proposal Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-09-23 00:08 +0800
Re: proposal john larkin <jl@glen--canyon.com> - 2026-09-22 09:36 -0700
Random noise generation (was: Re: proposal) Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-09-23 00:50 +0800
Re: Random noise generation (was: Re: proposal) john larkin <jl@htigct.com> - 2026-09-22 10:20 -0700
Re: Random noise generation Bill Sloman <bill.sloman@ieee.org> - 2026-09-23 03:51 +1000
Re: Random noise generation Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-09-23 01:55 +0800
Re: Random noise generation john larkin <jl@htigct.com> - 2026-09-22 17:35 -0700
Re: Random noise generation Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2026-09-23 15:14 +0000
Re: Random noise generation john larkin <jl@glen--canyon.com> - 2026-09-23 09:12 -0700
Re: Random noise generation Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-09-24 17:39 +0800
Re: Random noise generation Bill Sloman <bill.sloman@ieee.org> - 2026-09-25 02:05 +1000
Re: Random noise generation Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-09-25 01:39 +0800
Re: Random noise generation john larkin <jl@glen--canyon.com> - 2026-09-24 18:26 -0700
Re: Random noise generation Bill Sloman <bill.sloman@ieee.org> - 2026-09-25 16:46 +1000
Re: Random noise generation john larkin <jl@glen--canyon.com> - 2026-09-25 07:51 -0700
Re: Random noise generation Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-09-26 06:49 +0800
Re: Random noise generation john larkin <jl@glen--canyon.com> - 2026-09-26 07:25 -0700
Re: Random noise generation ehsjr <ehsjr@verizon.net> - 2026-09-26 12:57 -0400
Re: Random noise generation Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-09-27 06:29 +0800
Re: Random noise generation john larkin <jl@glen--canyon.com> - 2026-09-26 16:17 -0700
Re: Random noise generation Jan Panteltje <alien@comet.invalid> - 2026-09-27 08:25 +0000
Re: Random noise generation john larkin <jl@glen--canyon.com> - 2026-09-27 03:10 -0700
Re: Random noise generation Bill Sloman <bill.sloman@ieee.org> - 2026-09-26 15:48 +1000
Re: Random noise generation john larkin <jl@glen--canyon.com> - 2026-09-26 08:34 -0700
Re: Random noise generation Bill Sloman <bill.sloman@ieee.org> - 2026-09-27 15:45 +1000
Re: Random noise generation Bill Sloman <bill.sloman@ieee.org> - 2026-09-26 15:48 +1000
Re: Random noise generation liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-25 09:22 +0100
Re: Random noise generation john larkin <jl@glen--canyon.com> - 2026-09-25 07:56 -0700
Re: Random noise generation Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2026-09-25 15:36 +0000
Re: Random noise generation John R Walliker <jrwalliker@gmail.com> - 2026-09-25 16:59 +0100
Re: Random noise generation john larkin <jl@glen--canyon.com> - 2026-09-26 08:42 -0700
Re: Random noise generation Jan Panteltje <alien@comet.invalid> - 2026-09-25 17:19 +0000
Re: Random noise generation Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-09-26 04:08 +0800
Re: Random noise generation Jan Panteltje <alien@comet.invalid> - 2026-09-26 09:08 +0000
Re: Random noise generation Jan Panteltje <alien@comet.invalid> - 2026-09-26 09:09 +0000
Re: Random noise generation Bill Sloman <bill.sloman@ieee.org> - 2026-09-26 21:22 +1000
Re: Random noise generation john larkin <jl@glen--canyon.com> - 2026-09-26 08:57 -0700
Re: Random noise generation john larkin <jl@glen--canyon.com> - 2026-09-26 11:37 -0700
Re: Random noise generation Jan Panteltje <alien@comet.invalid> - 2026-09-27 08:25 +0000
Re: Random noise generation Bill Sloman <bill.sloman@ieee.org> - 2026-09-27 20:47 +1000
Re: Random noise generation Jan Panteltje <alien@comet.invalid> - 2026-09-26 18:00 +0000
Re: Random noise generation john larkin <jl@htigct.com> - 2026-09-25 17:09 -0700
Re: Random noise generation liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-25 22:12 +0100
Re: Random noise generation Jeroen Belleman <jeroen@nospam.please> - 2026-09-26 10:14 +0200
Re: Random noise generation liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-26 14:37 +0100
Re: Random noise generation Jeroen Belleman <jeroen@nospam.please> - 2026-09-26 23:09 +0200
Re: Random noise generation liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-27 09:15 +0100
Re: Random noise generation john larkin <jl@glen--canyon.com> - 2026-09-26 09:01 -0700
Re: Random noise generation liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-09-26 19:45 +0100
Re: Random noise generation Gerhard Hoffmann <dk4xp@arcor.de> - 2026-10-03 13:34 +0200
Re: Random noise generation Jeroen Belleman <jeroen@nospam.please> - 2026-10-03 16:03 +0200
Re: Random noise generation john larkin <jl@glen--canyon.com> - 2026-10-03 08:42 -0700
Re: proposal Bill Sloman <bill.sloman@ieee.org> - 2026-09-23 01:01 +1000
Re: proposal someone <2a59d59e3809f827ce709d3815e3950eef4a6a93af5557a93a7fdfba71460843@example.com> - 2026-09-21 21:00 +0000
Re: proposal Bill Sloman <bill.sloman@ieee.org> - 2026-09-22 17:10 +1000
Re: proposal john larkin <jl@glen--canyon.com> - 2026-09-22 04:21 -0700
Re: proposal Bill Sloman <bill.sloman@ieee.org> - 2026-09-23 02:17 +1000
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