A Zenitron variation on Zen v.8

Circlomanen · 3rd February 2006, 07:10 AM

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.

Circlomanen · 3rd February 2006, 07:20 AM

I saw that the power supplies had the wrong polarity.
New picture.

jh6you · 3rd February 2006, 08:23 AM

Smart and intersting . . .
Push-pull only with N-channel . . .

B3 and B4 control the bias current . . . ?

Regards
jh

Circlomanen · 3rd February 2006, 09:42 AM

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.

Circlomanen · 3rd February 2006, 10:27 AM

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.

Circlomanen · 3rd February 2006, 01:01 PM

Something like this.

Circlomanen · 4th February 2006, 04:58 AM

I was very tired yesterday. I made some mistakes when drawing this amp. Im not used to drawing on my computer....

Input is at R6 and R7.

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

Johannes.

jh6you · 4th February 2006, 06:05 AM

L1 and L2 are againt oscillation . . . or for what . . . ?

Regards
jh

flg · 4th February 2006, 06:23 PM

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???

Circlomanen · 4th February 2006, 07:36 PM

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

3rd February 2006, 07:10 AM	#1
Circlomanen diyAudio Member Join Date: Sep 2004 Location: Göteborg	A Zenitron variation on Zen v.8 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. __________________ We live in a horizontal world, why use vertical topologies???

3rd February 2006, 07:20 AM	#2
Circlomanen diyAudio Member Join Date: Sep 2004 Location: Göteborg	I saw that the power supplies had the wrong polarity. New picture. __________________ We live in a horizontal world, why use vertical topologies???

3rd February 2006, 01:01 PM	#6
Circlomanen diyAudio Member Join Date: Sep 2004 Location: Göteborg	Something like this. __________________ We live in a horizontal world, why use vertical topologies???

4th February 2006, 04:58 AM	#7
Circlomanen diyAudio Member Join Date: Sep 2004 Location: Göteborg	I was very tired yesterday. I made some mistakes when drawing this amp. Im not used to drawing on my computer.... Input is at R6 and R7. I would be very happy if I could get some feedback from all you out there. Johannes. __________________ We live in a horizontal world, why use vertical topologies???

4th February 2006, 07:36 PM	#10
Circlomanen diyAudio Member Join Date: Sep 2004 Location: Göteborg	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 __________________ We live in a horizontal world, why use vertical topologies???


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3rd February 2006, 08:23 AM	#3
jh6you Account Disabled Join Date: Aug 2002 Location: Near to the Pacific Ocean	Smart and intersting . . . Push-pull only with N-channel . . . B3 and B4 control the bias current . . . ? Regards jh

4th February 2006, 06:05 AM	#8
jh6you Account Disabled Join Date: Aug 2002 Location: Near to the Pacific Ocean	L1 and L2 are againt oscillation . . . or for what . . . ? Regards jh

4th February 2006, 06:23 PM	#9
flg diyAudio Member Join Date: Jul 2005 Location: North East	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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