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!!
If i use +-35VDC power supply,how about the output watts?
Thank you!!
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.
I want to try BD139 in a test Version of V2 next, with lower resistor values in the current source, and cascoded gain transistor.
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
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
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
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
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.
with the ZVP3310. If you lower the impedance of the
feedback loop, you can even this up a bit.
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.
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.
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.
First I left the default values, but after I tried with R2 = 22k and R3 = 100k, this was a bit better, but I prefer BS250...
Saludos
Daniel
Saludos
Daniel
Yesterday I tested one channel with the ZVP3310 and the other with the IRF9610. I was a bit sleepy but just could not hear any difference. Have you heard any difference or your opinion is based on measurements only? (I don't have a scope so just have to trust my ears).
Anyway I'll try to find the BS250 to give it a try.
Saludos,
Miguel
PS: are you español?
Anyway I'll try to find the BS250 to give it a try.
Saludos,
Miguel
PS: are you español?
The difference was not big and only at the top end. My speakers, 4-ways 94dB, use ribbon-tweeters with really high resolution. I also own only since two weeks a skope and the tests where made before. Now I am building a SOZ.
Daniel
P.S.: No, no soy español, soy suizo de habla alemana, pero mi madre es española
Daniel
P.S.: No, no soy español, soy suizo de habla alemana, pero mi madre es española
One of the nice things about very simple circuits like the
Zen is that you can substitute just about anything in and
it will work and probably even sound good.
Zen is that you can substitute just about anything in and
it will work and probably even sound good.
OK. I tried to solder that 1 x 1.2 mm mosfet but that tiny little little little (...) thing just refused to stick to the resistor and stuck to the iron. IRF9610 back again.
Mounted everything on the chassis and got it playing. I have to say that on my 87db speakers the sound was very nice from the two channels, no differences heard.
Now I have to worry about tempearture, as after around an hour those heatsinks were at 65ºC, which I think it is a little too much. Maybe I reduce the bias.
Mounted everything on the chassis and got it playing. I have to say that on my 87db speakers the sound was very nice from the two channels, no differences heard.
Now I have to worry about tempearture, as after around an hour those heatsinks were at 65ºC, which I think it is a little too much. Maybe I reduce the bias.
parts question
Hi. I'm building a BOZ/Zen4 amp. With the BOZ I had no problems finding parts, but for a Zen I can't find ZVP3310 (I can get IRF9610, but think BS250 is better for its Ciss=30pF). So I will try with a BS250, but I first want to hear from you guys what do you think about both of them, and do you have to change something in the circuit for BS250 to work well. If you must change things, could you specify what to change, with specific part names and values. Thank you in advance.
Hi. I'm building a BOZ/Zen4 amp. With the BOZ I had no problems finding parts, but for a Zen I can't find ZVP3310 (I can get IRF9610, but think BS250 is better for its Ciss=30pF). So I will try with a BS250, but I first want to hear from you guys what do you think about both of them, and do you have to change something in the circuit for BS250 to work well. If you must change things, could you specify what to change, with specific part names and values. Thank you in advance.
At the end the only change was BS250 in place of ZVP3310, VDS will be around 2.5V instead of 4V. I tried also BSS92, IRF9610 and IRF9520, but BS250 sounded better. I am listening to this amp now for 6 months and I am very happy with the sound.
Daniel
😉
Daniel
😉
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