My update lin topology

GEirin · 4th December 2007, 09:57 PM

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

Leolabs · 5th December 2007, 01:20 AM

Why boostrap???

MJL21193 · 5th December 2007, 01:26 AM

What's wrong with bootstrap???

Leolabs · 5th December 2007, 01:42 AM

Need to pay attention on the cap as it will influence the sound,although a careful design will avoid this.

AKSA · 5th December 2007, 02:21 AM

Nice circuit, Geirin, looks a lot like my AKSA!!

Very musical......

Hugh

GEirin · 5th December 2007, 02:23 AM

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

GEirin · 5th December 2007, 02:33 AM

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

AndrewT · 5th December 2007, 10:09 AM

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)

lumanauw · 5th December 2007, 02:02 PM

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?

destroyer X · 5th December 2007, 02:07 PM

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

5th December 2007, 01:26 AM	#3
MJL21193 Man Of Action! diyAudio Member Join Date: Mar 2007 Location: Picturesque Ontario Blog Entries: 16	What's wrong with bootstrap??? __________________ John Speaker Testing Jig Kit, Pictures, Pancakes, Patchwork

5th December 2007, 02:21 AM	#5
AKSA diyAudio Member Join Date: Sep 2001 Location: Melbourne, Australia	Nice circuit, Geirin, looks a lot like my AKSA!! Very musical...... Hugh __________________ Aspen Amplifiers P/L (Australia) www.aksaonline.com

5th December 2007, 10:09 AM	#8
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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) __________________ regards Andrew T.

5th December 2007, 02:07 PM	#10
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife-Brasil Northeast	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 __________________ Dx Voltage Regulator..350 watts, 5%: http://www.youtube.com/watch?v=3XaLRLMKi1I

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5th December 2007, 01:20 AM	#2
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Why boostrap???

5th December 2007, 01:42 AM	#4
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Need to pay attention on the cap as it will influence the sound,although a careful design will avoid this.

5th December 2007, 02:23 AM	#6
GEirin diyAudio Member Join Date: Jun 2004 Location: Mendoza	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

5th December 2007, 02:33 AM	#7
GEirin diyAudio Member Join Date: Jun 2004 Location: Mendoza	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

5th December 2007, 02:02 PM	#9
lumanauw diyAudio Moderator Join Date: Oct 2002 Location: Bandung	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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