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Old 4th December 2007, 09:57 PM   #1
GEirin is offline GEirin  Argentina
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Default My update lin topology

Hi all.

I decided to improve a lin topology amplifier. This is my version.
What is you opinion? Any comment for improvement are welcome.
Thank.

GEirin
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Old 5th December 2007, 01:20 AM   #2
Leolabs is offline Leolabs  Malaysia
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Why boostrap???
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Old 5th December 2007, 01:26 AM   #3
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What's wrong with bootstrap???
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Old 5th December 2007, 01:42 AM   #4
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Need to pay attention on the cap as it will influence the sound,although a careful design will avoid this.
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Old 5th December 2007, 02:21 AM   #5
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Nice circuit, Geirin, looks a lot like my AKSA!!

Very musical......

Hugh
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Old 5th December 2007, 02:23 AM   #6
GEirin is offline GEirin  Argentina
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Hi.

My idea is to improve my old amplifier (Philips 50W). I have two pcb and power supply +35-35V.
Other reason is: Aksa, DX and other amplifiers have bootstrap.
Yamaha have any amplifiers witch bootstrap (Ax392, RX795. RX-V1400-2400...).
Good sound?
My original amplifier is in the other thread: No Miller cap, double bootstrapping.

GEirin
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Old 5th December 2007, 02:33 AM   #7
GEirin is offline GEirin  Argentina
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Hi Hugh.

Thank for you reply.
Yes, looks a lot like a Aksa, and DX, old Sansui, Yamaha.... output Roender.
My version is "ecleptical" lin topology amplifier.

Regards

Guillermo
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Old 5th December 2007, 10:09 AM   #8
AndrewT is offline AndrewT  Scotland
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Hi,
what is the purpose of r16 (47k)?
R13 (1k0) looks a bit big for a range of bias currents.
Why the input bootstrap (r5)?
I would expand the NFB/stability options by adding an R+C parallel to that lone C8 (5pF)
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Old 5th December 2007, 02:02 PM   #9
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Hi, GEirin,

Nice design

I experienced that C3 makes the amp unstable (unless you make it some R series to C3). What is the purpose of C3?
Also, what is the difference if Q5-Q7 is made darlington, not CFP?
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Old 5th December 2007, 02:07 PM   #10
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Default Good ideas Geirin.... you are selecting many good ideas and using them together


C3 will work better with a resistance in series.... 22 ohms for instance.

C8 is a nice idea..used by Sansui into model 517 and 717.

Good ideas together use to produce nice sonics.

regards,

Carlos
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