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Old 16th September 2002, 05:05 PM   #1
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Default ZEN V.4 Parts

Hello, can i use BC550 instead of ZTX450 and IRFP9610 or IRFP9520 instead of ZVP3310A?

If i use +-35VDC power supply,how about the output watts?

Thank you!!
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Old 16th September 2002, 05:30 PM   #2
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BC550C works instead of ZTX450 in my Zen V2.

I want to try BD139 in a test Version of V2 next, with lower resistor values in the current source, and cascoded gain transistor.
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Old 16th September 2002, 07:14 PM   #3
kirc is offline kirc  Slovenia
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I'm using MPSA 42 instead of ZTX450. It's work OK !
The only problem maybe, that the VBE voltage is not 0.66V, but it's higher (about 0.77V). The result is a higher bias accros the Q1 and Q2.

best regards,
Leon
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Old 16th September 2002, 07:23 PM   #4
kirc is offline kirc  Slovenia
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Ups...

And about Mosfet ZVP3310A. I'm using IRF9620 and work OK. IRF9610 is better than IRF9620. IRF9520 is also good choise. There is no problem with part, maybe the capacitors (quality and values) are quite important.

My version of ZEN v4 works great.

best regards,
Leon
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Old 16th September 2002, 09:47 PM   #5
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The 9610 worked OK, but I did get better performance
with the ZVP3310. If you lower the impedance of the
feedback loop, you can even this up a bit.
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Old 19th December 2002, 12:20 PM   #6
miguel2 is offline miguel2  Portugal
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Hi,

Sorry to bring this up again, but I am having an hard time to get ZVP3310's. So I will be using IRF9610. My questions are:

- Does the Zen V4 works with IRF9610 without any modifications?

- What changes shall I make to optimise it:

Quote from NP:

"If you lower the impedance of the feedback loop, you can even this up a bit."

How can this be done? (ie. parts values please)

Thanks.
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Old 19th December 2002, 12:30 PM   #7
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From what I heard a BS250 mosfet will also work. Please note that I heard this, I have not the slightest experience with Zen products.
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Old 19th December 2002, 02:38 PM   #8
df is offline df  Switzerland
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My Zen V4 works with BS250 better then with IRF510, I have tried both....

Daniel
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Old 19th December 2002, 02:43 PM   #9
df is offline df  Switzerland
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Sorry IRF9610 not IRF510!
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Old 19th December 2002, 04:11 PM   #10
miguel2 is offline miguel2  Portugal
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hi df,

have you made any changes in the feedback loop as Nelson says?
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