ZEN-V4 Balanced ?

chorei · 18th September 2002, 03:18 PM

hi,

what about zen-v4 balanced ?
i find the schematic on the http://web.vip.hr/pcb-design.vip
will this work ?
what are advantages of this one over the unbalanced zen-v4 ?

ergo · 18th September 2002, 04:02 PM

hmmm, why does this guy leave the output capacitors in the circuit? One of the great virtues of balancing this schematic is that you do not need caps anymore.....

In Balanced Zen schematic he has removed them.

Ergo

Nelson Pass · 18th September 2002, 04:57 PM

It's simple enough, and it works great without modification.

I have noted previously that the best way is to leave the
big caps in the circuit so that the feedback loop remains
cap coupled and DC does not appear at the input. Then you
simply tap off to the speakers inside the caps so that the
speakers are direct coupled.

This works great and gives you the flexibility to run it either
way. I have units are set up with a single XLR, and two RCA's
for inputs, and three pairs of output connectors; two pair
cap coupled for stereo operation, and one pair direct coupled.

rothko · 19th September 2002, 06:32 AM

With same output power, balanced operation need lower supply voltage than single-ended operation. Because maximum output voltage of balanced topology is double of single-ended topology in ideal case. This means that you can reduce supply voltage in balanced operation, which results in reduction of heat dissipation. How to change register values for that?

If I want balanced only, still do I need big caps(10000 uF) for feedback?

chorei · 20th September 2002, 05:23 PM

hi,

if the output capacitors would be removed, then how to connect the 221 K resistor and 5 pF (2 x 10 pF in series) capacitor ( feedback) ?

speaker would be connected between C - D ?

Nelson Pass · 20th September 2002, 06:09 PM

If you don't want DC on the input, you must
have a cap in series with the 221K. That's why
it's just as easy to leave the original caps in and
direct couple the speaker inside them.

For lower supply voltages, you simply adjust the
Zener stack and the value of the trim pot to get
the Drain of Q1 to about 1/2 the supply.

chorei · 22nd September 2002, 10:36 AM

thanks mr.pass.

will the 2 x 0,4 C/W heatsinks be enough for the one
balanced Zen-V4 channel? (without fan)

the power supply voltage should be 50 V unregulated, like used
by NP.

36v/400 va transformer is enough for one balanced Zen-v4 ?

PMA · 22nd September 2002, 03:33 PM

Chorei,
balanced version also brings lower distortion and lower hum compared to unbalanced version.
Pavel

Nelson Pass · 23rd September 2002, 09:44 PM

36V at 400VA ought to work fine.

PsykoK · 26th September 2002, 06:15 AM

hi,

It's possible to use a balanced zen v4 in unbalanced mode too as an aleph power amp?

18th September 2002, 03:18 PM	#1
chorei diyAudio Member Join Date: Jun 2002	ZEN-V4 Balanced ? hi, what about zen-v4 balanced ? i find the schematic on the http://web.vip.hr/pcb-design.vip will this work ? what are advantages of this one over the unbalanced zen-v4 ?

19th September 2002, 06:32 AM	#4
rothko diyAudio Member Join Date: Jan 2002 Location: Seoul	With same output power, balanced operation need lower supply voltage than single-ended operation. Because maximum output voltage of balanced topology is double of single-ended topology in ideal case. This means that you can reduce supply voltage in balanced operation, which results in reduction of heat dissipation. How to change register values for that? If I want balanced only, still do I need big caps(10000 uF) for feedback? __________________ Rothko

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18th September 2002, 04:02 PM	#2
ergo diyAudio Member Join Date: Mar 2001 Location: Tallinn, Estonia	hmmm, why does this guy leave the output capacitors in the circuit? One of the great virtues of balancing this schematic is that you do not need caps anymore..... In Balanced Zen schematic he has removed them. Ergo

18th September 2002, 04:57 PM	#3
Nelson Pass The one and only Join Date: Mar 2001	It's simple enough, and it works great without modification. I have noted previously that the best way is to leave the big caps in the circuit so that the feedback loop remains cap coupled and DC does not appear at the input. Then you simply tap off to the speakers inside the caps so that the speakers are direct coupled. This works great and gives you the flexibility to run it either way. I have units are set up with a single XLR, and two RCA's for inputs, and three pairs of output connectors; two pair cap coupled for stereo operation, and one pair direct coupled.

20th September 2002, 05:23 PM	#5
chorei diyAudio Member Join Date: Jun 2002	hi, if the output capacitors would be removed, then how to connect the 221 K resistor and 5 pF (2 x 10 pF in series) capacitor ( feedback) ? speaker would be connected between C - D ?

20th September 2002, 06:09 PM	#6
Nelson Pass The one and only Join Date: Mar 2001	If you don't want DC on the input, you must have a cap in series with the 221K. That's why it's just as easy to leave the original caps in and direct couple the speaker inside them. For lower supply voltages, you simply adjust the Zener stack and the value of the trim pot to get the Drain of Q1 to about 1/2 the supply.

22nd September 2002, 10:36 AM	#7
chorei diyAudio Member Join Date: Jun 2002	thanks mr.pass. will the 2 x 0,4 C/W heatsinks be enough for the one balanced Zen-V4 channel? (without fan) the power supply voltage should be 50 V unregulated, like used by NP. 36v/400 va transformer is enough for one balanced Zen-v4 ?

22nd September 2002, 03:33 PM	#8
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	Chorei, balanced version also brings lower distortion and lower hum compared to unbalanced version. Pavel

23rd September 2002, 09:44 PM	#9
Nelson Pass The one and only Join Date: Mar 2001	36V at 400VA ought to work fine.

26th September 2002, 06:15 AM	#10
PsykoK diyAudio Member Join Date: Sep 2002 Location: Mulhouse, France	hi, It's possible to use a balanced zen v4 in unbalanced mode too as an aleph power amp?

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