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1. [Amps] Hotswitching (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Sat, 8 Apr 2006 00:44:57 -0700; Some years ago when testing a 24vdc relay, I noticed a healthy spark whenever I disconnected the 24v PS from the coil. Curiosity led me to use my oscilloscope and a 10x probe to measure reverse poten; /archives//html/Amps/2006-04/msg00109.html (7,615 bytes)
2. Re: [Amps] Hotswitching (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sat, 8 Apr 2006 13:51:40 +0200 (CEST); Maybe. What I read was that during ground testing, the supply was unregulated, and went up to around 70 volts, causing the thermostat to arc because the voltage it was trying to switch was too much -; /archives//html/Amps/2006-04/msg00111.html (7,568 bytes)
3. Re: [Amps] Hotswitching (score: 1): Author: Bill Turner <dezrat@copper.net>; Date: Sat, 08 Apr 2006 07:07:06 -0700; ORIGINAL MESSAGE: <snip> ** REPLY SEPARATOR ** You can't have "DC voltage"? I know the laws of physics are often rewritten on this reflector but this seems a bit over the top. :-) 73, Bill W6WRT ____; /archives//html/Amps/2006-04/msg00112.html (7,170 bytes)
4. Re: [Amps] Hotswitching (score: 1): Author: Bill Turner <dezrat@copper.net>; Date: Sat, 08 Apr 2006 07:18:06 -0700; ORIGINAL MESSAGE: ** REPLY SEPARATOR ** There is a similar effect with choke-input power supplies. If you'd like to see this, observe the DC output with an oscilloscope while the load is suddenly rem; /archives//html/Amps/2006-04/msg00113.html (7,762 bytes)
5. Re: [Amps] Hotswitching (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Sat, 8 Apr 2006 08:13:00 -0700; The Apollo's battery potential was 70v, NASA did this to reduce current so they could save on conductor weight. Motor vehicles are beginning to go to higher battery potentials to save on Cu expense a; /archives//html/Amps/2006-04/msg00114.html (10,366 bytes)
6. Re: [Amps] Hotswitching (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Sat, 8 Apr 2006 08:20:09 -0700; Indeed, Bill, I've seen 50%. The fix is to use a resonant-choke instead of a fixed-choke. Rich Measures, 805.386.3734, AG6K, www.somis.org _______________________________________________ Amps mailing; /archives//html/Amps/2006-04/msg00115.html (9,088 bytes)
7. Re: [Amps] Hotswitching (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Sat, 8 Apr 2006 08:22:03 -0700; D. C. should be defined as a PS potential which lasts until the end of the contest. Rich Measures, 805.386.3734, AG6K, www.somis.org _______________________________________________ Amps mailing list; /archives//html/Amps/2006-04/msg00116.html (8,187 bytes)

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