Elektor-Giant 1000W

[togo]

And here the security schematic.

[togo]

And a photo of my amp.

[togo]

Ok something new:

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

[Netlist]

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?

[runebivrin]

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.

[boris_dumery]

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