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Old 9th February 2015, 08:00 AM   #1
bluevas is offline bluevas  Indonesia
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Default Another CFA from MJ Magazine

Dear guys,

Greetings,...this is my first thread...how do u think about this amplifier from this link https://www.google.com/url?sa=t&rct=...kmgHc31_BLWO2g

It is similar with VSSA with different values.

Kinds regards,

Josh
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Old 9th February 2015, 08:22 AM   #2
bimo is online now bimo  Indonesia
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Quote:
Originally Posted by bluevas View Post
Dear guys,

Greetings,...this is my first thread...how do u think about this amplifier from this link https://www.google.com/url?sa=t&rct=...kmgHc31_BLWO2g

It is similar with VSSA with different values.

Kinds regards,

Josh
Because slew rate of CFA determine by resistor feedback's value, use 10K will make slew rate low. The advantage of CFA is high slew rate, make it low will loose the advantage and worse compare with VFA.
I think the designer do not know how to design an CFA. You should simulate it first to compare with VSSA,
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Old 9th February 2015, 08:40 AM   #3
bluevas is offline bluevas  Indonesia
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Mr. Bimo, do u have any simple VFA amplifier circuit?
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Old 9th February 2015, 08:51 AM   #4
bimo is online now bimo  Indonesia
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Quote:
Originally Posted by bluevas View Post
Mr. Bimo, do u have any simple VFA amplifier circuit?
May be you will try this or this

Those amplifier was tested by some of my online friends
One of them said, AKSA 55 of my version better than OCL 150 kit although he use cheap ordinary components.

Or, you may try another design on my blog: http://anistardi.wordpress.com
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Old 9th February 2015, 04:58 PM   #5
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Quote:
Originally Posted by bimo View Post
May be you will try this or this
Hi Bimo,

By chance, OCL150 topology looks very close to R. Elliott's P3A where he's using Sziklai outputs instead of Darlington.

Jacques
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Old 9th February 2015, 05:02 PM   #6
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Quote:
Originally Posted by bluevas View Post
Dear guys,

Greetings,...this is my first thread...how do u think about this amplifier from this link https://www.google.com/url?sa=t&rct=...kmgHc31_BLWO2g

It is similar with VSSA with different values.

Kinds regards,

Josh
Make it, not break it.

VSSA all over the world.
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First One VSSA
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Old 9th February 2015, 11:52 PM   #7
bimo is online now bimo  Indonesia
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Quote:
Originally Posted by jacques antoine View Post
Hi Bimo,

By chance, OCL150 topology looks very close to R. Elliott's P3A where he's using Sziklai outputs instead of Darlington.

Jacques
I am not inspire by P3A, but by AKSA 55 from Hugh Dean when I made Perkutut Amplifier. I do not know who create OCL 150 is.
AKSA 55 is simple, and THD is not low enough but harmonic profile is good with 2nd harmonic dominant. It have high slew rate, too.

Last edited by bimo; 9th February 2015 at 11:57 PM.
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Old 9th February 2015, 11:55 PM   #8
bimo is online now bimo  Indonesia
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Originally Posted by Lazy Cat View Post
Make it, not break it.

VSSA all over the world.
Make VSSA instead
You would not regret
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Old 11th February 2015, 04:49 AM   #9
bluevas is offline bluevas  Indonesia
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Which one have the more power? Is Lazy Cat's VSSA or MJ 93 VSSA? Thank you guys...

Best regards,

Josh
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Old 11th February 2015, 12:55 PM   #10
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VSSA can withstand +/-45 V rails and can deliver 90 Wrms/8 Ohm
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