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Old 2nd August 2013, 05:12 PM   #131
PMI is offline PMI  United States
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Originally Posted by Krisfr View Post
What is the maximum voltage and current that this is designed for? Cost of Board anticipated?
+/-50V, 6A max, pk.

Cost will be $10, + shipping + Paypal fee.

The maximum voltage is limited by the voltage rating of the pass transistor, because the full supply voltage will appear across it briefly at startup.

Maximum average current depends on dropout voltage setting and size of pass transistor heatsink.

As discussed and shown above, I designed for class A-B, up to 100W per channel, 8-ohm load.

The board is also designed to allow mounting the rectifier diodes and pass transistors from below the board to allow higher current/dropout voltage combinations, but in most cases this would not be needed.
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Old 2nd August 2013, 05:15 PM   #132
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Old 2nd August 2013, 05:27 PM   #133
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Pete,

Could you give us values for R in your CRCRC supply, the one with 80mV ripple, so that we can compare price/performance ratio? I think that cap multiplier is clear winner in any case.
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Old 2nd August 2013, 05:37 PM   #134
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Originally Posted by freeman View Post
Hi Pete,
Thanks again for all you do (and thanks to Mr Evil, of course!). Can you discuss suitability of low power applications? I basically need +/-15v to power a preamp and crossover at about 200 - 500mA. What size transformer and what other tweaks are needed? Many thanks. Regards. -Darrell
I'll do some calculations over the weekend. In general, I would probably use smaller value and lower profile electrolytic caps and heatsink, both to save some money, and lower the height of the power supply a bit for a smaller chassis. Up to 250 mA, I would probably use a small encapsulated EI transformer, for 500mA, a small toroid.
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Old 2nd August 2013, 05:53 PM   #135
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Originally Posted by PMI View Post
Yes, within a reasonable range, with typical 8-ohm speakers, but you always have a greater range of adjustment with the resistor values. So, I don't think you were wrong to do that.
It was so difficult to remove resistor from the compact pcb that many "F" words were used.
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Old 2nd August 2013, 07:01 PM   #136
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Originally Posted by ivanlukic View Post
It was so difficult to remove resistor from the compact pcb that many "F" words were used.
I thought that I was making layouts with plenty of room! ...

For the CLCRC filter, I used a 10uH 3.5A inductor (under $0.50) and a 0.33R 5W resistor ($1.50). The 5W is overkill, but I had those on hand.

It may be useful to think of this as a classic PI filter, followed by an RC filter. The purpose of the pi filter with the inductor is to filter out rectifier switching noise in the audio frequency range. The RC hits the ripple, which is what is left after the PI filter.
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Old 3rd August 2013, 02:30 AM   #137
gannaji is offline gannaji  India
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Dear Pete,
Can you kindly supply one set of all semiconductors (Except Rs and Cs) for one PSU board along with the PCB?
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Old 3rd August 2013, 04:05 AM   #138
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Yes. Including the rectifier diodes, or just the transistors in the filter?
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Old 3rd August 2013, 11:47 AM   #139
gannaji is offline gannaji  India
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Yes. Including the rectifier diodes, or just the transistors in the filter?
Q1 to Q12 and D1 to D4. (as per the BOM) All.
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Old 3rd August 2013, 08:16 PM   #140
Bensen is offline Bensen  Belgium
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Mr. Evil,

I would like to use this cap multiplier circuit in following situation, do you see any reason's why it would not work:


Main xfmr r-core 500va 2x36v for OPS
A second xfmr r-core 30va 2x9v for front end drivers

For front end and drivers psu, the secondaries of both xfmr's will be in series.
I would like to use your cap multiplier (with higher voltage rating components) for the driver stage with an adjustable voltage drop to about 8v.
A second cap multiplier would be used for the front end with a voltage drop set at about 4v.

Greetz
Ben
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