| BalZenPre output impedance question - Click HERE for Original Thread |
| claudio |
Hello,
I would like to know about the output impedance of the Balanced Zen Pre: not using the P3-P4 pot, the output impedance will be given by the sum of R1 + R3 ?
I would like to use this pre with the Ciuffoli's Power Follower , but this ampli accepts a maximum of 300 ohm impedance from the pre.
Thanks
Claudio |
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| claudio |
Hello again,
is anybody going to answer this post?
Thanks :D |
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| HarryHaller |
The output impedance of the balanced zen preamp is R2 plus R10 or 971 ohms. This should be fine. I believe the Ciuffoli's Power Follower frequency response graph show a -3dB point of about 150kHz with a 1k source impedance driving it which sounds reasonable for an IRF 150 as a follower. Email me and I will tell you where to send the check for design consulting.
http://www.geocities.com/ResearchTr...ollower_99c.gif
http://www.passdiy.com/pdf/balzenpre.pdf
H.H. |
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| claudio |
Harry,
thanks for the answer. Actually Mr. Ciuffoli says different things about the pre-output impedance: in the "COMPLETE CIRCUIT " page he says "..OUTPUT RESISTANCE NO MORE 300 OHM", while in the "COMPLETE ARTICLE WORD" page he says: "..and should be preceded by voltage gain stage, with an output swing not lower than 10Vrms and Rout < 1000Ohm."
Little confusing, isn't it?
I tried to email you, but the Administrator said I can't! :confused:
I wrote the Adm to see if there is a way out.
Claudio |
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| HarryHaller |
Less than 1K is fine. I built a similar amp it sounded fine. It is a very good circuit. Go build one, I think you will love it.
H.H. |
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