ZEN-V4 Balanced ?

[chorei]

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]

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]

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]

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]

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]

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]

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]

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

 

[Nelson Pass]

36V at 400VA ought to work fine.

 

[PsykoK]

hi,

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

 

[Nelson Pass]

I don't seem to understand the question.

 

[PMA]

Nelson,
maybe the question was about the possibility of single-ended input signal for balanced zen version (I think it should work).
Pavel

 

[Nelson Pass]

If that's the question, then the answer is that the
ZV4 needs a balanced source to operate balanced.

Because the circuit is inverting, you could drive 1/2
of a bridged pair with a single source and then feed
its output back to the input of the other channel through
the appropriate resistance, and then it would operate
bridged, but this is not as good a solution as operating
balanced mostly because the distortion of the first
channel is reproduced in the second.

 

[PsykoK]

Sorry for this understanding question, after seeing the Balanced Zen-v4 on the http://web.vip.hr/pcb-design.vip I want to know if it can drive a single-ended signal as PMA explained!

Nelson Pass> Thanks for your answer !!!

Then to have a balanced and unbalanced input of the same amp I must build an Aleph and not a Zen power amp

 

[till]

why not build ZEN V4 and balanced line stage? the BoSoZ will be cheaper than the bigger heatsinks and else parts you will need for the aleph.

 

[PsykoK]

I start with the power amp and after with the preamp!!!

For the preamp I planed to build the BOSOZ as you sugest but the Zen-V4 can't use ths balanced signal from the BOSOZ, only the unbalanced !!!

 

[moses]

The BoSoZ can output a balanced or unbalanced signal, same with input. So with a BoSoZ you could have a balanced or unbalanced input, which you could feed to either a Zen 4, or a Balanced Zen 4.

Also, I assume that English is probably not your native langauge, so just to let you know, it is usually considered impolite and slightly rude to use lots of exclamation marks("!"s) or any at all unless it is really necessary. Just to let you know .

 

[PsykoK]

As you can see I'm french and english is not my native language, sorry for all exclamation marks I don't know that it can considered impolite
It 's just a chat habit , I'm going to correct it