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Simple Symetrical Amplifier
Simple Symetrical Amplifier
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Old Yesterday, 02:56 PM   #4201
UltimateX86 is offline UltimateX86  France
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Join Date: Jun 2004
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Simple Symetrical Amplifier
Quote:
Originally Posted by N101N View Post
It works regardless of feedback. I personally dislike trickeries like bootstrapping.
You could consider referring the emitter resistors of the input stage to ground.

Hello,

in this case there would be no more css ?

how would you add a buffer ?

connected to floating or regulated power supply?

yamaha use N channel drain output with a buffer, maybe we should do the same

thanks

Last edited by UltimateX86; Yesterday at 03:12 PM.
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Old Yesterday, 08:12 PM   #4202
padamiecki is offline padamiecki  Poland
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Quote:
Originally Posted by UltimateX86 View Post
Hi pada

The UGS could be a good preamp for a circlotron

UGS adventures
Thank you
But I need single inp to symmetric out and usg is symmetric to symmetric
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regards, Pawel
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Old Yesterday, 08:35 PM   #4203
UltimateX86 is offline UltimateX86  France
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Simple Symetrical Amplifier
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Old Yesterday, 09:42 PM   #4204
N101N is offline N101N
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There would be no CCS, but well-defined references. Your circuit is complete, no need for a buffer. JFET input would be better. BC560C is scanty. Could you accept a common supply voltage lower than 35 V?
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Old Today, 06:18 AM   #4205
UltimateX86 is offline UltimateX86  France
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Simple Symetrical Amplifier
I already have transformers for the ouput stage, but we could use lower for the input and vas.

but I want to see your idea with JFet
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Old Today, 07:01 AM   #4206
UltimateX86 is offline UltimateX86  France
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Simple Symetrical Amplifier
On the other hand if we continue with Jfet we will have to go on another topic, I posted here because the amp was similar to the VSSA

VSSA Circlotron
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Old Today, 08:39 AM   #4207
UltimateX86 is offline UltimateX86  France
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Simple Symetrical Amplifier
I made that, but I need help for biasing Jfet with the differential feedback

I have use 27 ohm for 2/3 idss (env 5mA) but R3 is too low for the feedback
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Old Today, 11:57 AM   #4208
N101N is offline N101N
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We are nearly there, except two source resistors going to ground in the place of R3.
Complications: JFETs should be operated at low drain-source voltage. You would need four matched pieces of 2SK170BL, a bipolar cascode and two extra resistors.
The 2SK170BL and 2SA1381 are fine.
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