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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.
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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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Hi BONSAI,

Is it possible to have a copy of your cd with titan 1000 / gigant 1000 please?

txs for replying.

Best regards.

Boris

boris_dumery@yahoo.com
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