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-   -   Juma's Easy-Peasy Capacitance Multiplier (https://www.diyaudio.com/forums/power-supplies/297921-jumas-easy-peasy-capacitance-multiplier.html)

Bare 24th November 2016 01:55 AM

Likely 2 volts.

xrk971 24th November 2016 02:50 AM

I think it's more like 4 to 5v as typical of cap multipliers with IRFP240.

olafk 25th November 2016 06:04 AM

Hi, here are some experiences ....
I have tested the PSU shortly. I used resistors of 24 ohms/50W, which then makes a current of more than 1.7A.
Positive channel with 50V input after rectifier -> 42.8 V at output. I measure a ripple of 0.3V !!! There is something wrong!
Negative channel 50V input -> 41.8V output. 0.000V ripple - not measurable, very nice. But overall, a high voltage drop in my opinion.
After 10 seconds one of the Chinese MUR820 exploded. So what - You get what you pay for. :D
After the exchange against better things on the weekend I will measure again We have a really exciting hobby!
regards Olaf

gaborbela 25th November 2016 11:16 AM

1 Attachment(s)
Quote:

Originally Posted by olafk (https://www.diyaudio.com/forums/power-supplies/297921-jumas-easy-peasy-capacitance-multiplier-post4895584.html#post4895584)
Hi, I have built a PSU free according to the Schematic which X has published in Post No. 95 with the parts I had on the shelf.
Will be tested next days or weekend. Looks good so far, not yet the optimal layout, but will developed. Just a few pictures for the entertainment :)

regards Olaf

Hi olafk
Would you be so kind to share the black and white with us , PDF is Ok.
Thank you :) If you do not want to publish please send me a PM.
Greetings
The JUMA type one sided for iron, etc. transfer (you must resize it with your printer)

olafk 25th November 2016 11:28 AM

Please wait a moment. It will be published when test is finished. See also post above.

regards Olaf

xrk971 25th November 2016 12:11 PM

Quote:

Originally Posted by olafk (https://www.diyaudio.com/forums/power-supplies/297921-jumas-easy-peasy-capacitance-multiplier-post4896948.html#post4896948)
Hi, here are some experiences ....
I have tested the PSU shortly. I used resistors of 24 ohms/50W, which then makes a current of more than 1.7A.
Positive channel with 50V input after rectifier -> 42.8 V at output. I measure a ripple of 0.3V !!! There is something wrong!
Negative channel 50V input -> 41.8V output. 0.000V ripple - not measurable, very nice. But overall, a high voltage drop in my opinion.
After 10 seconds one of the Chinese MUR820 exploded. So what - You get what you pay for. :D
After the exchange against better things on the weekend I will measure again We have a really exciting hobby!
regards Olaf

Maybe it was the bad diode that made the ripple bad? I notice this circuit does not have a series resistor with 1uF at output as snubber. Try adding 2.2R or 4.7R in series with output 1uF to clean up any noise. The circuit in post 1 uses 10k and 220R - maybe try those values? But since negative rail worked, my guess is it was bad diode.

erik777 26th November 2016 04:21 AM

An 8V drop on neg rail, I guess comes
With the territory using a cap filter. Getting a higher V Torroid isn't that big of deal, when compared to performance.

olafk 26th November 2016 02:18 PM

Very nice
 
4 Attachment(s)
Hi, now I have built the second module with a few small changes. Great surprise - the measurements are the same (also AC on positive rail :mad:). So everything with the Oszikkoskop checked - no AC :) (will check my meter later). Soundcheck with an amplifier: Very nice! At least as good as with a regulated PSU (compared with Apex PSU for SR100), subjectively even better. Without a signal the loudspeaker is absolutely silent. No hum, no noise. 7 ... 8V drop is no problem with the result. I'm very satisfied.
Sprint file and PDF's will follow later.

regards Olaf

xrk971 26th November 2016 02:24 PM

Quote:

Originally Posted by olafk (https://www.diyaudio.com/forums/power-supplies/297921-jumas-easy-peasy-capacitance-multiplier-post4898308.html#post4898308)
Hi, now I have built the second module with a few small changes. Great surprise - the measurements are the same (also AC on positive rail:mad:). So everything with the Oszikkoskop checked - no AC :). Soundcheck with an amplifier: Very nice! At least as good as with a regulated PSU (compared with Apex PSU for SR100), subjectively even better. Without a signal the loudspeaker is absolutely silent. No hum, no noise. 7 ... 8V drop is no problem with the result. I'm very satisfied.
Sprint file and PDF's will follow later.

regards Olaf

Very nice work Olafk! So for the record, what is the AC ripple in mV with load connected?

apexaudio 26th November 2016 03:05 PM

Quote:

Originally Posted by olafk (https://www.diyaudio.com/forums/power-supplies/297921-jumas-easy-peasy-capacitance-multiplier-post4898308.html#post4898308)
Hi, now I have built the second module with a few small changes. Great surprise - the measurements are the same (also AC on positive rail :mad:). So everything with the Oszikkoskop checked - no AC :) (will check my meter later). Soundcheck with an amplifier: Very nice! At least as good as with a regulated PSU (compared with Apex PSU for SR100), subjectively even better. Without a signal the loudspeaker is absolutely silent. No hum, no noise. 7 ... 8V drop is no problem with the result. I'm very satisfied.
Sprint file and PDF's will follow later.

regards Olaf

Nice work, if you don't use regulated PSU for amplifier I suggest cap multiplayer only for VAS like on SR150.1 schematic in post #1819 thread: http://www.diyaudio.com/forums/solid...ml#post4198210
Regards


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