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Old 25th November 2004, 12:21 AM   #1
moe29 is offline moe29  United States
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Default Zen V5

Threw this together this past week for fun.

Working fine on the bench. 20V rails with 360mv across R9-R10.

DC offset 40mv after warming up for about 20 minutes.

This heatsink is just warm at the moment, so upping the bias will
be no problem later.

Now to build the other channel and take a listen

Just wanted to post a picture of a Zen V.
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Old 25th November 2004, 12:27 AM   #2
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Default scary p2p

...
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Old 25th November 2004, 08:44 PM   #3
Raka is offline Raka  Europe
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very scary wiring

Congratulations, it looks very big, how does it sound?
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Old 25th November 2004, 09:10 PM   #4
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Hi,

Can you provide your L information... I like to use CLC PSU ever since I tried one, it runs cool without the need to use heat sink and the regulators. The disavantage is just size but for diy, one off amps no problem for me..

The Butcher
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Old 25th November 2004, 11:55 PM   #5
moe29 is offline moe29  United States
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Raka -I haven't listened yet, just built the one channel on
the bench to see if it would work. I will now build up a second
channel and give it a listen. I haven't built much using point to point
wiring, except the SOZ. The Zen 5 wasn't so hard actually. I just
tried to keep the components close. The spacing of the FETS was
due to using holes that were drilled and tapped previously.

chris ma - The Inductors were from MCM. Unfortunately they
don't carry them in stock anymore. I've seen complaints that they
are not of high quality, but i've used them successfully in many PSUs.
I too will be looking for a new source for 2mH inductors very soon
now! It would be nice to know where to get enamaled wire in the
same gage, because rolling your own couldn't be that hard.

I really just posted the pics to see if there was more interest in the
Zen 5. As soon as I do some listening i'll post thoughts here on this
thread. Probably in a couple of weeks (maybe less)
(i'm finishing a Pearl too!)
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Old 26th November 2004, 05:39 AM   #6
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Hi
Quote:
I really just posted the pics to see if there was more interest in the v5
I built a V5 using Mr pass PSU design but 35V rails, fets are IRFP 240 amd IRFP9240 biased at 2,5A per device, generates a lot of heat! I realy like this amp, has a tremendous bottom end driving RCF L12P48s. Well worth the job!
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Old 26th November 2004, 03:04 PM   #7
moe29 is offline moe29  United States
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Ingvar - Post some pictures!

Higher voltage on the rails made for better measurements if I
remember the article correctly. I had to go with 20V rails because
I was using transformers that I had on hand.

I'm looking forward to hearing them.
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Old 29th November 2004, 01:04 AM   #8
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Very nice Moe29, have you gotten a chance to listen to it yet?


Well I got these huge heatsinks that I was originally going to use to build a 30-40 watt SOZ. Then I realized I needed a balanced pre to get the full use out of it and the added cost of transformers has put that on hold for now. my Alpeh 2s are still being built, for a first DIY attemp I think you'll be surprised, I'll have to post some pics.

I would like to hack at the ZenV5, because its simple, and of course thats appealing. These sinks can definitely handle 2.5A @30V

In figuring the rails by the calculations i got a bit confused:

20V rail example
(20 + 8 +3) / 1.4 which gives 22 V AC -- ok.

(30 + 8 + 3)/ 1.4 gives 29 ---- ??
How can a 29-30V secondaries give 30V after regulation?

Or do I say (30+8+3)=41 and go with 40V secondaries
For each channel I'd like to use 625VA@ 35 or 40V, would this be ok?

John H.

p.s. sorry for the threadjack

dimensions = 21 3/4" X 15" 1/2" baseplate 2.5" fins
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Old 29th November 2004, 01:06 AM   #9
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And the amp PCB, Its from somebody here on the forum, cant remember at the moment, I fattened up the traces a bit.
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Old 29th November 2004, 01:43 AM   #10
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The Original, I think its by PedroPO
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