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Old 9th June 2008, 08:18 AM   #21
togo is offline togo  Austria
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And here the security schematic.

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Old 9th June 2008, 08:25 AM   #22
togo is offline togo  Austria
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And a photo of my amp.
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Old 11th June 2008, 05:55 PM   #23
togo is offline togo  Austria
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Ok something new:

I have powered up the caps in the psu.
C22,C23 each 440F/100V
C19,C26 each 4700F/25V
C20,C21 each 220F/16V

4 little caps 4,7pF like in the schematic from the AF-3.

Nothing helps against my nasty noise in the power-off sequence.
So i take this caps out of my design.

It's a funny amp from elektor.
You can put in and take out elements and it wouldn't be better or worse :-)

Don't know what else i can/should do.
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Old 11th June 2008, 07:57 PM   #24
Netlist is offline Netlist  Belgium
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What Jan said made sense to me.
What about making a fixed connection with your bench power supply (+ and - 12VDC) that remains on after powering down the amp
What is that 12V used for?
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Old 26th August 2009, 01:08 PM   #25
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Am I the only one who thinks the transformers look a little small for a 1000W amp?

I wonder if it might not be a good idea to connect the caps for the 90V supply from the 90V rail to ground, rather than to the 12V rails. But since there's a definite need for a beefier transformer, why not get a 60-0-60 transformer and skip the stacked power supplies?

EDIT: I just realized that those supplies only feed the driver circuitry. I suppose there's a hefty toroid underneath?
Still, I'd change the supplies to stack the secondaries of the transformers directly, and then rectify and filter the individual voltages separately.
Do wizards use spell checkers?

Last edited by runebivrin; 26th August 2009 at 01:15 PM.
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Old 7th December 2011, 08:15 PM   #26
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Is it possible to have a copy of your cd with titan 1000 / gigant 1000 please?

txs for replying.

Best regards.


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Old 18th September 2014, 07:02 AM   #27
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can anyone pl help looking for old issues of elekto june1986 n augst1986 for portable mixer part1 n 3.
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Old 18th September 2014, 08:41 AM   #28
carolus is offline carolus  Belgium
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Originally Posted by victoryz View Post
... help ...elekto june'86 & augst'86 ....portable mixer part1 n 3.
Hi Victoryz

I have () ... only in "Dutch" (Nederlandse taal)
(ref.: "Maandblad elektuur" : Draagbaar mengpaneel compact en veelzijdig, auteur A. Schmeets).

Allez, salukes.
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Old 4th December 2014, 05:46 PM   #29
okcrum is offline okcrum  United States
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You're seeing the 70V power amp supply still holding up (from C15/C16?) at turn off, after the 90V discharges and the output devices shut off, I think.

The diodes are definitely necessary in this case.

Last edited by okcrum; 4th December 2014 at 05:55 PM.
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