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Total 6 documents matching your query.

1. [Amps] AL1500 PSU design (score: 1)
Author: f6irf@free.fr
Date: Mon, 11 Jun 2007 14:54:38 +0200
I recently bought a second-hand AL1500, and the PSU blew up when I turned it on the first time... (the amp was not used since 2002) On top of the burned 10ohms /10W resistor "starting resistor" in th
/archives//html/Amps/2007-06/msg00075.html (7,788 bytes)

2. Re: [Amps] AL1500 PSU design (score: 1)
Author: f6irf@free.fr
Date: Tue, 12 Jun 2007 10:36:52 +0200
Karl-Arne Yes you are right: twice the peak AC voltage applies to full wave rectifiers with transformer middle-tap... so even the original 5x1N5408 should do the job... my mistake ! Guess that my hyp
/archives//html/Amps/2007-06/msg00077.html (11,699 bytes)

3. Re: [Amps] AL1500 PSU design (score: 1)
Author: pat_f6irf <f6irf@free.fr>
Date: Tue, 12 Jun 2007 20:39:37 +0000
Tom W8JI a &eacute;crit : Hi Tom The new cap. assembly bleeder is 1.2 Mohms (12x 100k) so I was expecting the condensers to charge roughly at half the voltage - just for a first try... But I did not
/archives//html/Amps/2007-06/msg00081.html (12,685 bytes)

4. Re: [Amps] AL1500 PSU design (score: 1)
Author: pat_f6irf <f6irf@free.fr>
Date: Wed, 13 Jun 2007 18:11:55 +0000
Tom W8JI a &eacute;crit : Just what I had in the drawers - not a good reason ??? Tom, I won't blame you because you are defending your baby... it is a normal "mother" reaction... I am just trying to
/archives//html/Amps/2007-06/msg00082.html (8,192 bytes)

5. Re: [Amps] AL1500 PSU design (score: 1)
Author: f6irf@free.fr
Date: Thu, 14 Jun 2007 09:35:33 +0200
Tom, The first thing I did after the first bang was to check the transformer. I found that it was wired for 220V, I rewired it for 240V according to the manual indications (I have around 235V +/-5V
/archives//html/Amps/2007-06/msg00087.html (9,263 bytes)

6. Re: [Amps] AL1500 PSU design (score: 1)
Author: f6irf@free.fr
Date: Mon, 23 Jul 2007 12:15:37 +0200
Just as a conclusion of my previous posts: - Replaced all diodes and capacitors on the rectifier board (used BY255, and new 2kV ceramic disk capacitors) - Installed a new capacitor board made of 12x
/archives//html/Amps/2007-07/msg00366.html (9,103 bytes)

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