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Old 9th January 2004, 01:48 AM   #1
hbarki is offline hbarki  Indonesia
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Lightbulb ZEN V4 questions for beginner

Hello,

I am a DIY newby. I don't have an EE background, so pardon me if my questions sound a little bit dumb . Just got my PCB's from PASSDIY, could ayone help me to clarify some stuff on the power supply drawing in figure 6:

1. The text says this is the "typical circuit for one channel and the grounding layout for a stereo amplifier". I am confused, since the picture shows two outputs, marked "+50V" and "other ch". Does the other channel goes to the +50V input for the second channel?

2. What can be eliminated from the power supply drawing if I decide to run dual mono (1 power supply per channel)?

3. The text says "if you use a single transformer supply for two channels, tie both of their grounds together and to both AC legs of the bridge". ?!?!?.... Can someone please clarify this?

4. On the PCB, if -OUT goes to the negative speaker terminal, which one goes to the positive speaker terminal?

Thanks for your help!
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Old 9th January 2004, 03:37 AM   #2
moe29 is offline moe29  United States
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question #4... The Zen amp's topology reverses polarity: your
speaker's + terminal should be attached to ground and the - to
the -OUT on the PCB... You can read about this in the ZEN amp
article (Zen V1)
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Old 9th January 2004, 05:50 PM   #3
moe29 is offline moe29  United States
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well, since no one else is responding, i'll try to help you out...

#1) The schematic is for one channel. You will need to duplicate
all of this for the second channel. If both channels are housed in
one chassis, then use the grounding scheme shown. The rectifier
bridge is used to isolate the two channels to ground... hook it up
as shown. If you are making mono-blocs you can omit this part.
(the isolating rectifier bridge) Everything else should remain.

#2) Dual mono in one chasis, build as shown in the schematic.
if building mono-blocks do as above.

#3) Don't use 1 transformer, then you won't have to worry about
this, and you'll get better performance. If you must use just one,
post again for help.

I'm no expert, but i'm sure if i've made a mistake in trying to help
someone with some real knowledge will help clarify things.

good luck, let us know what you decide!
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Old 9th January 2004, 06:07 PM   #4
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The bridge we are talking about is used to isolate the circuit
ground from the earth and chassis ground, this with an eye
toward preventing ground loops while maintaining a safety
circuit should the AC line somehow get connected to the
secondary system of the amp. It has been discussed in more
detail in previous Zen Variations.

1) This schematic provides for the possibility of two
amplifiers on the same chassis, but which would share the
isolating rectifier bridge, although they don't have to. The
power supply as shown is one channel. If you are making
monoblocks, omit the "other channel" connection, but do not
omit the rectifier bridge, rather attach the "other channel" to
the circuit ground also.

3) This was a reference to above, where on the isolating bridge
the + and - pins go to earth-ground/chassis. The AC pins of the
bridge are tied together and to both the circuit grounds.
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Old 9th January 2004, 11:25 PM   #5
hbarki is offline hbarki  Indonesia
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Thanks for your help!

I think I will go for 2 transformer dual mono .

Is it okay if substitute the 25000uF caps with 47000uF, is bigger the better?
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