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buzzforb 10th October 2011 02:44 AM

Waiting on parts again and waistin time thinkin and had a question. I was impressed with what Nelson has accomplished with BA-3 and thinking of other interesting circuits that perform well and are still simple. One that comes to mind is the Circlotron article by Rothacher. The distortion numbers are very good and get even better with a nice device like the SS fets. Question is, can something like this be used as a VAS instead of the usual standalone power amp or output stage. Bigger easier load than speaker. Numbers should only improve with smaller die parts. LU jfets have been used successfully in DAO follower. Even the 2013 would be a candidate. BF862, J310. If possible, could be very nice. Clean power would be important. I will scribble on paper while out of town. Probably should burn it as waste of time. Even if possible, i probably couldn't get it to work. Still figuring out biasing of Jfets:D

Zen Mod 10th October 2011 03:58 AM

sketch please , so we all can laugh together .

I'm doing exactly the same , all the time .


buzzforb 10th October 2011 11:25 AM

Little light on the subject that makes things interesting.


Originally Posted by Nelson Pass (
I mentioned it because it's an interesting example of how
things work - the output device is actually driven by the
voltage across the resistor with current provided by the
input JFET. This voltage has been bootstrapped by the
output, so now it depends on the gain of the output

So you have to ask yourself - is this really a follower?


Michael Rothacher 10th October 2011 12:48 PM

When you stare into an abyss, the abyss stares back at you. :darkside:

buzzforb 10th October 2011 01:26 PM

It doea and it is deep. This circuit will screw with your head more than most. I will probably have to build it to have a chance of understanding it. That being said, i got a feeling this has real potential

Michael Rothacher 10th October 2011 01:45 PM

That's the spirit, buzz. Show it you're not afraid.

buzzforb 10th October 2011 01:50 PM

What if i am:D

Nelson Pass 10th October 2011 05:47 PM

Then pretend you're not.


jacco vermeulen 10th October 2011 05:54 PM

Encouragement tune : The Platters (The Great Pretender - 1955 ).mpg - YouTube

Nelson Pass 10th October 2011 07:28 PM

Stare at a circlotron schematic and recite the question,

Why is there something rather than nothing?


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