A Zenitron variation on Zen v.8 - diyAudio
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Old 3rd February 2006, 07:10 AM   #1
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Default A Zenitron variation on Zen v.8

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This is a Zenitron variation on Zen v.8.
No in or output caps. Just one big choke, 2 x 150 mH 0,6 ohms DCR.
Any feedback will be appreciated!
(I just need som Lovoltecs to build it.)

Johannes.
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Old 3rd February 2006, 07:20 AM   #2
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I saw that the power supplies had the wrong polarity.
New picture.
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Old 3rd February 2006, 08:23 AM   #3
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Smart and intersting . . .
Push-pull only with N-channel . . .

B3 and B4 control the bias current . . . ?

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jh
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Old 3rd February 2006, 09:42 AM   #4
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Quote:
B3 and B4 control the bias current . . . ?
Yes. There should be a voltage divider with a resistors and a potentiometer,but I didnt have the time to draw it.
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Old 3rd February 2006, 10:27 AM   #5
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Quote:
Yes. There should be a voltage divider with a resistors and a potentiometer,but I didnt have the time to draw it.
A resistor with a capacitor in paralell from source of the J-Fet to the gate of the mosfet and a ccs from there to B+ rail.
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Old 3rd February 2006, 01:01 PM   #6
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Something like this.
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Old 4th February 2006, 04:58 AM   #7
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I was very tired yesterday. I made some mistakes when drawing this amp. Im not used to drawing on my computer....
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Input is at R6 and R7.

I would be very happy if I could get some feedback from all you out there.

Johannes.
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Old 4th February 2006, 06:05 AM   #8
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L1 and L2 are againt oscillation . . . or for what . . . ?

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jh
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Old 4th February 2006, 06:23 PM   #9
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I guess you are not the "Circlotron" member from some time ago. Forgive me for not looking up those threads. Those posts were full of ideas but I beleive most of them were for a voltage gain version, common source...
I've been working on a very similar thing, JFET/Cascoded in a Circlotron output. The output works very good in simulation. It's a simple "Zen-like" driver that I've had to experiment so much with. What do you plan on driving this circuit with???
I also wonder about the L's in the source??? But what about the .22ohms?? I beleive thay may be usefull as a source R but they are not in exactly that configuration??? They should be in place of the L's???
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Old 4th February 2006, 07:36 PM   #10
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The" Ls" are a bifilare winded 2 X 150 mH choke, It fuction is to shield the signal from the drain to feed back around the circuit and make a voltage follower output from this circuit.
This circuit has voltagegain. The 0,22 Ohms resistors are just some local source-feedback to make the circuit stable and nice. They are probably not needed.
There is more info about this circuit in some of my own threads about the Zenitron.

The Zenitron
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