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1. [Amps] Strange power supply (score: 1): Author: "Barrie Smith" <barrie@centric.net>; Date: Wed, 19 Apr 2006 18:52:23 -0600; I recently boxed-in my all-purpose power supply with thin panels of wood, in order to protect the cats, and run my 432 amp. Just prior to the box-in, I ran my 8877 6M amp at 4200 volts idle, and 3800; /archives//html/Amps/2006-04/msg00301.html (7,179 bytes)
2. Re: [Amps] Strange power supply (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Wed, 19 Apr 2006 21:07:09 -0400; Barrie, Your clue is the hum. Check all the filter caps for the HV supply. My guess is that's the problem. Best, Will ** REPLY SEPARATOR ** On 4/19/06 at 6:52 PM Barrie Smith wrote: _________________; /archives//html/Amps/2006-04/msg00302.html (9,041 bytes)
3. Re: [Amps] Strange power supply (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Thu, 20 Apr 2006 03:22:29 +0200; Sounds that you lost a diode string. Is that a rectifier bridge or a doubler circuit? 73 Peter I recently boxed-in my all-purpose power supply with thin panels of wood, in order to protect the cats,; /archives//html/Amps/2006-04/msg00304.html (8,755 bytes)
4. Re: [Amps] Strange power supply (score: 1): Author: "k7fm" <k7fm@teleport.com>; Date: Wed, 19 Apr 2006 18:31:17 -0700; Are you missing any cats? Colin K7FM _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-04/msg00305.html (7,621 bytes)
5. Re: [Amps] Strange power supply (score: 1): Author: "Barrie Smith" <barrie@centric.net>; Date: Wed, 19 Apr 2006 19:51:50 -0600; _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-04/msg00306.html (9,553 bytes)
6. Re: [Amps] Strange power supply (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Thu, 20 Apr 2006 03:58:25 +0200; If the voltage drop is that large and you have the loud hum it is more then likely that there will a bad diode 73 Peter _______________________________________________ Amps mailing list Amps@contesti; /archives//html/Amps/2006-04/msg00307.html (9,932 bytes)
7. Re: [Amps] Strange power supply (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 20 Apr 2006 11:39:32 +0200 (CEST); Like Peter, I would suspect one of the diode stacks has gone open circuit. If it was the filter capacitors, the hum would be 120Hz. If it was the cat, the hum caused by purring is modulated at a lowe; /archives//html/Amps/2006-04/msg00309.html (7,515 bytes)
8. Re: [Amps] Strange power supply (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Thu, 20 Apr 2006 05:57:37 -0700; Cats make a noise c. 6Hz. Rich Measures, 805.386.3734, AG6K, www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/li; /archives//html/Amps/2006-04/msg00310.html (8,455 bytes)
9. Re: [Amps] Strange power supply (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Thu, 20 Apr 2006 06:02:28 -0700; The easy way to measure filter-C is to measure the time it takes for them to discharge through the bleeder / equalizer resistance to 37% of V-max. The formula is C = T/R. Rich Measures, 805.386.3734,; /archives//html/Amps/2006-04/msg00311.html (10,250 bytes)
10. Re: [Amps] Strange power supply (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Thu, 20 Apr 2006 12:22:48 -0400; Peter, He said though, "60 cycle?". He isn't for sure what the frequency of the hum is. With one diode open, you would essentially have a half wave power supply only conducting on every cycle. If you; /archives//html/Amps/2006-04/msg00312.html (9,765 bytes)
11. Re: [Amps] Strange power supply (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 20 Apr 2006 18:34:45 +0200 (CEST); Will, You have more faith in semiconductors than I have retained after being in the industry for the last 27 years! Interestingly, over that period, I have had more semiconductor failures in my equip; /archives//html/Amps/2006-04/msg00313.html (8,928 bytes)
12. Re: [Amps] Strange power supply (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Thu, 20 Apr 2006 12:53:19 -0400; Peter, Correct, it don't take that long to check them all. To check those silicon alley diodes though, I don't think a regular ohm meter will do it since they're actually several diodes in series, an; /archives//html/Amps/2006-04/msg00314.html (10,351 bytes)
13. [Amps] Strange Power Supply (score: 1): Author: harold b mandel <ka1xo@juno.com>; Date: Thu, 20 Apr 2006 12:53:22 -0400; Working with telephone company power supplies for about 44 years has shown me that Will Matney's, (et al), comments are dead on. For me, power supplies were in two usual flavors: High Voltage/Low Cur; /archives//html/Amps/2006-04/msg00315.html (9,186 bytes)
14. Re: [Amps] Strange power supply (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Thu, 20 Apr 2006 15:21:05 -0400; It could be either 60 or 120 Hz. What is usually called hum are the harmonics, not the fundamentals, since our hearing is much more sensitive to the higher frequencies, 400 to 1000 Hz or so. 60 Hz an; /archives//html/Amps/2006-04/msg00317.html (10,520 bytes)
15. Re: [Amps] Strange Power Supply (score: 1): Author: KD7QAE <KD7QAE@ARRL.NET>; Date: Fri, 21 Apr 2006 03:56:04 +0100; Good points Hal. I am a firm believer in closing the door on transients by having a series impedance, line to line HF capacitance, common mode impedance, line to neutral HF capacitance and finally li; /archives//html/Amps/2006-04/msg00320.html (10,636 bytes)
16. Re: [Amps] Strange Power Supply (score: 1): Author: Bill Turner <dezrat@copper.net>; Date: Fri, 21 Apr 2006 09:15:45 -0700; ORIGINAL MESSAGE: ** REPLY SEPARATOR ** If I'm doing the math right, that's equivalent to 1000 GHz. Is that what you meant? I find it hard to believe frequencies that high would propagate down AC mai; /archives//html/Amps/2006-04/msg00326.html (8,163 bytes)

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