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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: Re: Aksa compared to Leach Amp ? posted by grege on November 9, 2002 at 01:51:18:
"OK djk, you're the guru."Nawww, I just really like these things.
"I must be confused as to what D13, D14, R11 and Q5 are doing on the Leach Amp Version 4.5. I thought cascode Q5 was part of the ccs. Maybe we are talking about different versions of the Leach and AKSA circuit diagrams."
Q5 is the cascode, you can remove it if you like.
http://users.ece.gatech.edu/~mleach/lowtim/graphics/ckt.pdf
R11 is the load resistor for the diff pair. D13,14 with C2,4 provide a stable and clean supply for R15 which provides the current for the long tailed pair on the negative rail. This supply also biases the cascode on the positive rail (if you want it). A look at how simple it can be (schematic on page 2):
http://users.ece.gatech.edu/~mleach/papers/lowtim/feb76feb77articles.pdf
With modern high gain transistors you could delete the pre-drivers (Q8, 9, and R26, 27), and adjust the bias accordingly.
Another variation:
https://www.onsemi.com/pub/Collateral/AN1308-D.PDF
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Follow Ups
- Links to Schema - djk 02:32:23 11/09/02 (5)
- Re: Links to Schema - grege 03:19:35 11/09/02 (4)
- Yes-No-Maybe - djk 19:47:08 11/09/02 (3)
- Re: Yes-No-Maybe - weinstro 11:37:10 11/12/02 (2)
- Re: Yes-No-Maybe - djk 01:05:03 11/13/02 (1)
- Re: Yes-No-Maybe - aksa1@optushome.com.au 22:26:15 11/14/02 (0)
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