PA04 Apex...psu ideas ?

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Freq Band

Freq Band

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I have a few PA04 high voltage/high current opamps.
I also have their evaluation boards , along with their liquid-coolable heatsinks.

http://www.cirrus.com/en/products/pa04.html

I'm wondering... how crazy do I need to make the power supply(ies) volt/amperage wise, given that these
are spec'd at 200V (+VS to –VS), 20A each.

I also have the PA03's...( ±75V, 30A )
http://www.cirrus.com/en/products/pa03.html

Why ? you ask ?
Because I can.
I realize huge PSU's like these are dangerous.....so...where might I find some surplus/prebuilt/or pulls from other inexpensive outdated instrumentation ? ?

=FB=
 
Last year I parted out my 100A psu which I used to use for stall current testing on DC motors. Having a high current power supply can be lethal. Make sure you are current limiting otherwise you'll be dumping all that current into your circuit.

How did you get hold onto these? Quite a serious stuff.
 
> how crazy do I need to make the power supply

To do what?

With +/-15V at 100mA you can put +19dBm in 600 ohms. No heat-sink needed. Almost as good as a 5532 can do with 1/10th the power.

If you are driving 2A3 or 300B tube grids, you may need the full 200V (offset below tube cathode) but still only 100mA.

The "loudspeaker" power is probably dissipation limited. They casually mention 300 Watts in 4 ohms, so you need a bit over 100V (say solid 110V or +/-55V) at maybe 450 Watts, 4 Amps.

> inexpensive

If aiming for an audio loudspeaker amp, find dead loudspeaker amps in this power range. 98% of these are dead in a transistor, not the power transformer.

In this economy, you can probably find "live" 300W amps pretty darn cheap, cash-raisers from under-employed bass players.
 
PRR said:
> how crazy do I need to make the power supply

To do what?
Click to expand...

Loudspeaker amps, using these power opamps, one per channel (with a simple input buffer).
Like a monster Chip Amp.
Do I have ~300w speakers to drive ? No.....but my musician friends do.

I successfully made a power amp this way using the much smaller PA12, which drive some bookshelf speakers easily.











 

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