Zen4 power supplie!

[arold19]

Hello! I stud in electronic but I am a beginner! I am very interresting by the Zen4 project! I have a question about the power supplie! At home, I have 8 big capasitor! 20 000uF 50 V can I but this capasitor in "parallel" for the recommanded 25 000uF or the 50 v value of the capasitor will be to dangerous? Thank you !!!

[nar]

You just have to connect them all parallel.Will make your bank of capacitors,assuming the power supply is asymetrical ( ie V+ and ground.)

If you need symmetrical power supply ( ie V+/GND/V-) then you have to get them like this

-C-C-C-C- V+ rail all capacitors + together

GNDGND- Ground (links minus of upper C and plus of
lower C alltogether)
-C-C-C-C- V-rail all capacitors - together


Hope this is clear enough but don't get your hands on it!!!!

Best regards

[arold19]

nar: can you saiy to me your e mail.... I try to put an image put it is impossible on this forum....?????

[vpharris]

For the Zen IV you only have V+ and Ground. If you use two of those capacitors in parallel, you will have 50,000 uF of capacitance. Make two amps for stereo, and you will have 4 spare capacitors left over.

For a better supply, use a low-resistance 2mH air-core inductor between the two caps in parallel, giving you C-L-C and a very good power supply. (That's a Pi filter). Do a search for posts by Nelson Pass with the words filter and supply and you should find some good comments by him. (You can't search for "Pi" because the search engine won't take two-letter words)

[arold19]

Thanl you veru much Vince Harris

[arold19]

but, what is the dimention of the wire for the inductor do you recomande me???

[nar]

I recommand air core,no saturation at high currents
The diameter of the wire must be as big as possible,
of course,to handle current.

A goog value is 2,7mH.DC resistance must be low.

The best way to do is take a big inductor for speaker crossover.Some are rated 300W.For hi-fi,perhaps.
But for a power supply,let's bet it doesn't hold more
than 25W continious DC.

With an air core inductor of 2,7mH and a wire diameter
of 1,4mm,let's say it's OK for the purpose

Hope this helps

[fcel]

arold19 ... to post an image ... try submitting the image without doing a preview first and make sure that the image is less than 100k in file size and of course the appropriate type of file.

[vpharris]

Here are a few of the threads in which Mr. Pass makes mention of the Pi filter I suggested. I should tell you that I don't have lots of experience, but I built a Zen IV and used a filter like this with C-L-C of 30,000uF, 2mH, 60,000uF and it works well. The inductor is 14Ga. wire (with a search you can convert from "AWG" wire gauge to mm). It's resistance is low so that it generates no heat, so I think the wire size is sufficient.

http://www.diyaudio.com/forums/showt...uctor#post9247
http://www.diyaudio.com/forums/showt...uctor#post7784
http://www.diyaudio.com/forums/showt...Erse#post13061
And... one more quote from Mr. Pass:
"For pi filter, something 1 mH or larger; I usually use
2 to 4 mH, and the value is not at all critical. On the
caps, I use lots of capacitance, usually distributed
equally on either side of the inductor. Again, this is
not critical."

So I would suggest that you not worry. Build your amp; maybe not in its final cabinet at first. If you don't have the inductors, don't use them. Listen and see if you like it! If you hear some noise from the power supply and you want to make it quieter, then find some inductors.

The ones that I got were from the first series on this page, 2.00mH, .306 ohms DC resistance. http://www.zalytron.com/erse.htm

[arold19]

It is dangerous or not to use 50V value capasitor for the power supply of the Zen V4 ??? Thank you!!!!