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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Another bit of reading..... posted by Thorsten on January 5, 2002 at 06:54:05:
I do not like global feedback
Separate voltage amp and output buffer
Output buffer: Bipol transistor, if needed 2T in compl foldback
this is feed by a constant current source.Regarding diffrential longtail pair input.
I prefer them feed by a resistor at emitters,
instead of const current source. Beacause of the
fact that current increases in T1 while decreases in T2
That is not the case with resistor in emittrrs.
And as I said local feedback.
I never want more than 40dB feedback, gain= 100*gain of closed loop
so resistors in emitters is standard.I right now favour single power supply.
For regulation, if nessesary, TL431, adjustable zenerdiod,
amplified with output transistor.I am intrested to try and use JFET (2SK117) in
input stages.
Have also begun study different TUBE-preamps-solutions.
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Follow Ups
- my philosophy in design of amps - groman 01/5/0207:42:08 01/5/02 (6)
- Constant current source vs. resistor. Differences? - groman 08:44:56 01/7/02 (5)
- Re: Constant current source vs. resistor. Differences? - Elso Kwak 13:17:29 01/7/02 (4)
- you did not quite understand - groman 15:16:49 01/7/02 (3)
- Re: you did not quite understand - Elso Kwak 23:42:40 01/7/02 (2)
- Current >T1 at the same time as current >T2, can not... - groman 14:53:02 01/8/02 (1)
- Re: Current >T1 at the same time as current >T2, can not... - Elso Kwak 02:09:12 01/9/02 (0)
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