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Groups > comp.arch.embedded > #27986
| From | Chris <xxx.syseng.yyy@gfsys.co.uk> |
|---|---|
| Newsgroups | comp.arch.embedded |
| Subject | Re: Gerbv |
| Date | 2018-08-20 01:12 +0100 |
| Organization | Aioe.org NNTP Server |
| Message-ID | <pld10t$13i4$1@gioia.aioe.org> (permalink) |
| References | (6 earlier) <pl9kkf$qg4$1@dont-email.me> <pla6r8$k8$1@gioia.aioe.org> <plbfkp$i70$1@dont-email.me> <plcr2r$qoj$1@gioia.aioe.org> <plcrt7$cmv$1@dont-email.me> |
On 08/19/18 23:44, Dimiter_Popoff wrote: > > Oh thanks, this is very encouraging. I think I can manage it somehow. > The best part of it is that you did not use any inert gas? > I have a handful of 4700 uF caps - some fast, some not - in a drawer > here, might just do the job... I'll experiment around next few days. > > Please share any details you might remember - voltage, capacitance > etc., I mean ballpark range. > > Dimiter > It was all a bit of a hack, but it was using the stored energy in the choke, back emf, to generate the arc on break. The choke was an old C core item, about 4" square, 5 amp rating, fwir. Wires stripped off and tightly twisted together, trimmed level at the ends, then copper clip to the twists and a tungsten scriber for the electrode at the tip. Tried various approaches, but thinking back, used a psu in current limit mode to charge the inductor, then arc on break. It's possible to get a neat rounded weld without gas, but it is a bit hit and miss. As this was to be refoamed up, used a magnifier to make sure there was a good weld between the two metals. If you have one of the old 5v 100amp or more computer psus, you could try that with home made copper electrodes to crush spot weld the twisted wires at the ends, as an alternative method. Not everyone has a junk box with iron cored chokes these days, though a large 50Hz low voltage transformer secondary winding might get the job done. Just got to experiment :-)... Chris
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Gerbv gnuarm.deletethisbit@gmail.com - 2018-08-16 12:22 -0700
Re: Gerbv Chris <c@b.a> - 2018-08-17 11:52 +1000
Re: Gerbv gnuarm.deletethisbit@gmail.com - 2018-08-16 21:58 -0700
Re: Gerbv Jack <jack4747@gmail.com> - 2018-08-16 22:41 -0700
Re: Gerbv Chris <c@b.a> - 2018-08-17 17:28 +1000
Re: Gerbv Theo Markettos <theom+news@chiark.greenend.org.uk> - 2018-08-17 12:34 +0100
Re: Gerbv Tim <tim@bugblat.invalid> - 2018-08-17 14:27 +0100
Re: Gerbv Theo Markettos <theom+news@chiark.greenend.org.uk> - 2018-08-17 19:15 +0100
Re: Gerbv Tim <tim@bugblat.invalid> - 2018-08-17 22:27 +0100
Re: Gerbv Theo Markettos <theom+news@chiark.greenend.org.uk> - 2018-08-18 13:13 +0100
Re: Gerbv Dave Nadler <drn@nadler.com> - 2018-08-18 08:27 -0700
Re: Gerbv Dimiter_Popoff <dp@tgi-sci.com> - 2018-08-18 20:22 +0300
Re: Gerbv Chris <xxx.syseng.yyy@gfsys.co.uk> - 2018-08-18 23:33 +0100
Re: Gerbv Dimiter_Popoff <dp@tgi-sci.com> - 2018-08-19 13:09 +0300
Re: Gerbv Chris <xxx.syseng.yyy@gfsys.co.uk> - 2018-08-19 23:30 +0100
Re: Gerbv Dimiter_Popoff <dp@tgi-sci.com> - 2018-08-20 01:44 +0300
Re: Gerbv Chris <xxx.syseng.yyy@gfsys.co.uk> - 2018-08-20 01:12 +0100
Re: Gerbv Dimiter_Popoff <dp@tgi-sci.com> - 2018-08-20 12:58 +0300
Re: Gerbv Chris <xxx.syseng.yyy@gfsys.co.uk> - 2018-08-20 13:55 +0100
Re: Gerbv lasselangwadtchristensen@gmail.com - 2018-08-21 11:22 -0700
Re: Gerbv gnuarm.deletethisbit@gmail.com - 2018-08-17 07:37 -0700
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