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Old 15th December 2012, 01:46 PM   #1
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Lightbulb VSSA Lateral MosFet Amplifier

VSSA - Very Simple Symmetrical Amplifier, something in between SSA and TSSA. Similar schematics posted a lot of times but not exactly the same.

With only six transistors you can get genuine current feedback, high bandwidth amplifier, capable of driving 4 ohm speakers. PCB can be very simple and small too.


VSSA MosFet Amplifier V1.4 final updated schematic. Enjoy.
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Last edited by Lazy Cat; 20th February 2013 at 06:58 PM.
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Old 15th December 2012, 01:53 PM   #2
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I'd prefer two pairs of output devices for 4 ohms, these laterals tend to be a bit short on max current compared to vertical mosfets and bipolars.
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Old 15th December 2012, 01:55 PM   #3
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Hi Lazy,

Why do you publish so stuff as i TSSA is not finish

It's lefting pot to adjust offset

Marc
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Old 15th December 2012, 01:58 PM   #4
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Lazy Cat, can u pls provide scope snap shot of this amplifier in action? What is its slew rate? Stable with speaker reactance at high frequency. Or this design only suitable for sub application? Very clear feedback scheme, i have never seen before.
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Old 15th December 2012, 01:59 PM   #5
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Quote:
Originally Posted by Tekko View Post
I'd prefer two pairs of output devices for 4 ohms, these laterals tend to be a bit short on max current compared to vertical mosfets and bipolars.
You can use ALF16N20W/ ALF16P20W, just need to check if they can be correctly driven by 2SC/2SA

Marc
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Old 15th December 2012, 01:59 PM   #6
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This looks like Gaborbela's '20yr' design to me ?
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Old 15th December 2012, 02:03 PM   #7
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Quote:
Originally Posted by Idefixes View Post
Hi Lazy,

Why do you publish so stuff as i TSSA is not finish

It's lefting pot to adjust offset

Marc
Your delay at TSSA finishing was the reason I had too much time to play around hahaha

No, 1k trimpot is for output bias, two 15k resistors are for input/VAS bias plus DC offset setting.
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Old 15th December 2012, 02:06 PM   #8
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Quote:
Originally Posted by Bigun View Post
This looks like Gaborbela's '20yr' design to me ?
I said it is not something new, just SSA/TSSA derivative.
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Old 15th December 2012, 02:07 PM   #9
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Old 15th December 2012, 02:16 PM   #10
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Quote:
Originally Posted by Lazy Cat View Post
Your delay at TSSA finishing was the reason I had too much time to play around hahaha

No, 1k trimpot is for output bias, two 15k resistors are for input/VAS bias plus DC offset setting.

I try to offer decent hosting conditions for TSSA beauty...

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