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

xrk971 17th November 2016 10:59 AM

Quote:

Originally Posted by jameshillj (https://www.diyaudio.com/forums/power-supplies/297921-jumas-easy-peasy-capacitance-multiplier-post4889055.html#post4889055)
Should have added that 'juma' would be the first to urge you to take his design and play with it to suit your own taste, etc - he's said quite often to not just follow his designs but do own homework and add own personal variations - ZenMod's pretty much the same


Juma is great - he has no pretensions of saying you have to use design as is or his name can't be associated with it. I have put this in TINA and results have guided selection of values for particular use. What I like about Juma's is it is the only one I know with a single active and is so easy I have schematic ingrained in memory.

jameshillj 17th November 2016 11:24 PM

Have a look at 'keantoken's" K-Multipliuer (K-Mx) - it's quite simple also and very clever indeed - does require specific parts for to work well but nothing particularly exotic - some pcbs available, I think.

thimios 17th November 2016 11:55 PM

Quote:

Originally Posted by Idefixes (https://www.diyaudio.com/forums/power-supplies/297921-jumas-easy-peasy-capacitance-multiplier-post4887583.html#post4887583)
Hi X,

Some little exercice......

Marc

Can you post the two sides separately in pdf or jpeg?

Idefixes 18th November 2016 11:02 AM

2 Attachment(s)
Quote:

Originally Posted by thimios (https://www.diyaudio.com/forums/power-supplies/297921-jumas-easy-peasy-capacitance-multiplier-post4889675.html#post4889675)
Can you post the two sides separately in pdf or jpeg?


xrk971 18th November 2016 11:35 AM

Thanks Marc. Any hope of stereo CM with all 4 outputs on a 100mmx100mm or is that too tight?

Idefixes 18th November 2016 02:14 PM

Quote:

Originally Posted by xrk971 (https://www.diyaudio.com/forums/power-supplies/297921-jumas-easy-peasy-capacitance-multiplier-post4890061.html#post4890061)
Thanks Marc. Any hope of stereo CM with all 4 outputs on a 100mmx100mm or is that too tight?

It dépend on 4700µf size so directly related to its voltage rating. With the 70x100mm version (mono version) i be able to put 35mm diam snap in cap so practicaly over 6800µ if want.

Marc

thimios 18th November 2016 03:09 PM

Oh sorry,my fault:(
I mean in black & white for home etching.:)

xrk971 18th November 2016 03:38 PM

I am fine with 25mm dia for 4700uF 63v Nichicon caps (12.5mm spacing radial leads).

Idefixes 18th November 2016 03:52 PM

Quote:

Originally Posted by thimios (https://www.diyaudio.com/forums/power-supplies/297921-jumas-easy-peasy-capacitance-multiplier-post4890240.html#post4890240)
Oh sorry,my fault:(
I mean in black & white for home etching.:)

Hi thimios. I will take a look to provide pdf this weekend.
Marc

propitious 18th November 2016 05:18 PM

The juma cap multiplier schematic that is in post 95 was what I used on my recent Cubie3 postings. Please look there and a few posts later. In practice I made a few minor changes by using 8.2mF caps for C1-C4, 2.2mF caps for C5-C10 and I changed R3 and R4 to 330 ohms to keep Q1 (T1) and Q2(T2) from ever turning off if the amp was ever in AB mode, as per recommendation from Cirlomanen. Also, I used one PS per channel (dual mono blocs) so it might be slightly overkill. Please note that the IRFP9140 that I pulled from my library had the D and S reversed. In practice, I just soldered the correct wires up, but I will correct the schematic the next time I draw it.
With 1.1A Iq I measured +-36.1VDC on the rails and 0.1mV or less AC on the rails just like xrk971 did. It is less than what my DMM can measure accurately. Like xrk971 says, this circuit is very impressive in measurements and in sound, not to mention its low cost and small size.


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