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Old 17th August 2005, 12:00 PM   #1
Phill is offline Phill  France
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Default Zen v5

Hello

Zen V5 is very tempting for its simplicity
it is however represented very little on the forum
very few specimens are represented in the gallery
it is only one exercise?
presents it good quality?
which is the best supply voltage? (if there is one of them )
The ZV5 is much more sensitive to supply noise than other amplifiers : can a supply pi be appropriate? (CRCRC or CLCLC)
thank you for your opinions
Phill
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Old 18th August 2005, 04:21 AM   #2
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In general, a CLC filter will be more effective and more efficient than a CRC. The CLC offers greater attenuation at high frequencies and (assuming that you're using large enough wire in the coil) very little loss. The problem is that inductors are more expensive and harder to find than resistors. Worse yet, they're physically big and heavy. With that in mind, a lot of people tend to go with resistors.
Resistors work well, just not as well as inductors. The power lost in the resistors can be offset if you start with a big enough transformer. You'll also have to provide sufficient ventillation for the heat given off by the resistors.
Adding on more sections, CLCLC instead of CLC, is a very effective way to improve the filter. It's just a question of money.
What rail voltage becomes a different question: How much power were you expecting to get out of the amplifier? You'll need to set a target wattage, then decide how much voltage will be required to meet that goal.

Grey
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Old 21st August 2005, 09:43 AM   #3
Phill is offline Phill  France
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thank you GRollins

I will specify my question:
"The ZV5 is much more sensitive to supply noise than other amplifiers ==> Figure 8 shows the schematic of such a power supply. In many ways this is typical of the power supplies for the Zen amps, but it uses all the tricks to get low noise and low source impedance."

can I use a supply pi I have? or I must remake a complete sypply ? to be satisfied with this amplifier ...


I have just read again file pdf, it is very explicit !
in spite of my poor English level!

these amplifier one very little built : why ?

thanks
Phill
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Old 21st August 2005, 12:54 PM   #4
moe29 is offline moe29  United States
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i built it.

The power supply isn't difficult to build... i wired it up point to point.

I haven't built the second channel yet, so i can't give you an opinion
on the sound quality... (shame on me) lol.

Go ahead and try it with a CLC... i'm sure as long as you have the
proper voltages it will work. For the best sound quality though,
i'd build the PSU as described in the article. I'm sure Mr. Pass put
some thought into it : )

good luck!


m.
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Old 21st August 2005, 10:51 PM   #5
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If you already have a power supply on hand with reasonable voltage and current capability, why not try it? The worst that can happen is that it doesn't satisfy you, at which point you can simply go ahead and build another one.
As to why people build one circuit and not another, remember that Nelson published the original Zen article quite some time ago. The other Zens are much more recent. There simply hasn't been enough time for people to build thousands and thousands of them. As long as the design is sound, I wouldn't worry myself over how many units have been built. It's not a popularity contest, it's a quest to build a decent amplifier. If the circuit suits you, build it. Don't worry about what others are (or are not) doing.

Grey
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Old 22nd August 2005, 07:05 AM   #6
Phill is offline Phill  France
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Quote:
Originally posted by GRollins
If you already have a power supply on hand with reasonable voltage and current capability, why not try it? The worst that can happen is that it doesn't satisfy you, at which point you can simply go ahead and build another one.

If the circuit suits you, build it. Don't worry about what others are (or are not) doing.

Grey


your opinion seems to me very wise!
thank you very much

Phill
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Old 22nd August 2005, 02:20 PM   #7
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Hi
Ive built four channels of this amp, it is really worth the job!
It sounds extremely powerfull at 35V rails, 2A /transistor.
Needs a lot of cooling! Use the psu design from the article.
Ive got a pcb design You can have if needed.

Ingvar
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Old 22nd August 2005, 03:17 PM   #8
Phill is offline Phill  France
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Quote:
Originally posted by ingvar ahlberg
Hi
Ive got a pcb design You can have if needed.

Ingvar

thank you for your contribution !

Phill
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Old 22nd August 2005, 04:44 PM   #9
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Default ZV5 regulated power supply

The Zen V5 regulated power supply uses two bridges: one for the positive and one for the negative supply voltage. It also uses complementary MOSFETs (IRFP240 and IRFP9240). While this looks pretty on a schematic, you could do it another way. You could keep the ground lines separate until after the regulating MOSFET (connect the negative terminal from one cap to the positive terminal of the other to create the ground reference) and duplicate the positive supply regulator with the IRFP240, or maybe even better, an IRFP044, for the negative supply regulator. The advantage is that both rails would use the same schematic and the same kind of MOSFET. Would there be any disadvantages? Would it be a problem that the ground line from the star point back to the transformer runs through a MOSFET and an inductor?

Comments?

Jeremy
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Old 22nd August 2005, 06:19 PM   #10
Phill is offline Phill  France
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I am not qualified to know if your idea is good
(if you had a schematic )
I hope that others will deliver their opinion
the idea is tempting because I have a great quantity of irfp240 after matching for a aleph 5, and I seek to use these mosfets.

Phill
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