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

e_fortier 30th December 2016 03:05 AM

1 Attachment(s)
Quote:

Originally Posted by chat72 (https://www.diyaudio.com/forums/power-supplies/297921-jumas-easy-peasy-capacitance-multiplier-post4932442.html#post4932442)
I have builted Juma 's cap multiplier (post 1) with a very good results for my headphone amp. I just wondering if these is any circuit that work the same way for high voltage applcation? (150-250v)
Thank

Just look here or schematic below;

DCPP Amp

Look for dotted square called B+ ripple filter.

Works like a charm, I often use it.

BR,
Eric

chat72 30th December 2016 04:16 AM

Great , Thank you both for information.

Regards

jameshillj 30th December 2016 04:17 AM

IRF840's will do and easy to find - plenty of others - can also use plain transistors, maybe darlingtons, etc

AndrewT 30th December 2016 09:43 AM

Quote:

Originally Posted by chat72 (https://www.diyaudio.com/forums/power-supplies/297921-jumas-easy-peasy-capacitance-multiplier-post4932442.html#post4932442)
I have builted Juma 's cap multiplier (post 1) with a very good results for my headphone amp. I just wondering if these is any circuit that work the same way for high voltage applcation? (150-250v)
Thank

Motor run capacitors are usually plastic film type and rated for 250Vac (roughly equivalent to 400Vdc).
Motor start capacitors are sometimes electrolytic. I don't recommend these even though they are rated for short term use on 240Vac mains systems.

If you need 300Vdc to 400Vdc capacitors, then motor run capacitors are about as good as you will ever need.
There may be some motor run caps rated for 400Vac (across the phases of a 3ph supply). These should be good for voltages upto 550Vdc, but do check with the manufacturer.

xrk971 30th December 2016 11:48 AM

I have used these in my audio circuits with great success. They sound very nice. They are liquid filled plastic film and designed to be pounded by large 240vac currents for years on end. I don't think there is any reliability issue - just huge in size.

This is 50uF 370vac (520vdc?)

https://www.amazon.com/TEMCo-Motor-R.../dp/B00FBRWUP0

AndrewT 30th December 2016 11:57 AM

1 Attachment(s)
Why has amazon done this?

Did you use a special procedure to save that link?

xrk971 30th December 2016 12:07 PM

Strange. No I did not do anything strange. Try this one from eBay same thing.

50 MFD 370v Round AC Electric Motor Run Capacitor HVAC 370 vac v volts 50 uf

This is manufacture website:
https://www.temcoindustrial.com/rc00...-370-volt.html

AndrewT 30th December 2016 01:12 PM

That link took me straight to the Ebay product.

jameshillj 30th December 2016 01:32 PM

Actually, 'chat' was asking for components for a high voltage (150 - 250V) equivalent of juma's C-Mx on 1st post this thread - excellent performance can be expected from the 'motor' caps but there's no real reason that electro caps will still create a good result - what's that saying about 'a horse and a cart' ...

chat72 30th December 2016 02:23 PM

Apart from different circuits that have been suggested to me which I'll try them out. (I find changing PSU do effect the sound and it's a lot more fun than changing coupling Cap :D)

The circuit in post 1 can be used for higher voltage provided appropriate components are used. However big 4700uf cap might be a problem. I'll try smaller value i.e. 470uf and see if I like it.


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