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Old 20th September 2010, 07:54 AM   #31
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Zener diodes can be used instead cascode tranzistors.
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Old 21st September 2010, 11:44 AM   #32
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Transistor instead diode in current miror give better simetry.
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Old 21st September 2010, 01:16 PM   #33
Symon is offline Symon  United Kingdom
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Quote:
Originally Posted by apexaudio View Post
Zener diodes can be used instead cascode tranzistors.
Just an observation, Zeners provide a fixed voltage drop but don't provide a fixed voltage to
the collector of the input pair.
So Zeners don't really do the same job as the cascode.

Also aren't Zeners rather noisy in this position?

Last edited by Symon; 21st September 2010 at 01:37 PM.
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Old 21st September 2010, 08:53 PM   #34
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Quote:
Originally Posted by Symon View Post
Just an observation, Zeners provide a fixed voltage drop but don't provide a fixed voltage to
the collector of the input pair.
So Zeners don't really do the same job as the cascode.

Also aren't Zeners rather noisy in this position?
Voltage on collector is fixed anyway, transistor give gain with diferent collector carrent, collector voltage difference is les than 0,5V in linear area before saturation (non linear area with high THD, amp clip)

Last edited by apexaudio; 21st September 2010 at 09:13 PM.
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Old 25th September 2010, 12:31 PM   #35
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Rail voltage for SR200 is +/-75V, I prefer sound of bass from this amplifier topology.
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Old 25th September 2010, 02:12 PM   #36
jerryo is offline jerryo  Isle of Man
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Hi apexaudio,
how does this amplifier compare with the "Lynx" amp by Jan Dupont? His design is with reference to some "classic" studio amplifiers.
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Old 25th September 2010, 02:41 PM   #37
Mamak is offline Mamak  Malaysia
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you have pcb for reference amplifier?if had plez give link
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Old 25th September 2010, 06:49 PM   #38
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Originally Posted by jerryo View Post
Hi apexaudio,
how does this amplifier compare with the "Lynx" amp by Jan Dupont? His design is with reference to some "classic" studio amplifiers.
Can't be compared with "Lynx", it's complete different topology. "Lynx" is OP based amp litle look like B500 but my amp don't use global feedback to OP amp input like "classic" amps.
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Old 25th September 2010, 06:53 PM   #39
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you have pcb for reference amplifier?if had plez give link
There is no final pcb version of 'Studio Ref Amp' only prototype, I will post pcb layout here.
Regards
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Old 26th September 2010, 12:15 PM   #40
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Studio Reference or Lab Reference Amp. I want to have high sound performance like in Hi-Fi amps or better, and output power of mid PA amps.
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