DIY Audio & Electronics
Compact PCB For All JFET Circlotron
Posted 25th January 2011 at 12:59 AM by Michael Rothacher
Updated 2nd October 2011 at 11:59 AM by Michael Rothacher
Updated 2nd October 2011 at 11:59 AM by Michael Rothacher
This is the artwork for the PCB in the pictures. It fits into the ExpressPCB miniboard profile so it's a little cheaper to have made.
It will be necessary to check the orientation of the bias pots (I can't remember). I wouldn't want you to blow-up your $30 JFETs.
It will be necessary to check the orientation of the bias pots (I can't remember). I wouldn't want you to blow-up your $30 JFETs.
Total Comments 5
Comments
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I've been searching for the schematic of the JFET version with no luck. Could someone point me to it? Thanks in advance.Posted 5th February 2011 at 08:08 PM by ichiban
Updated 8th February 2011 at 07:20 PM by Michael Rothacher -
The entire article can be found at Pass DIY.
There are no changes in the JFET version. Just drop 'em in.
Only the bias adjustment is different, since the Power JFETs bias up around 2V.
The same instructions apply.Posted 8th February 2011 at 07:18 PM by Michael Rothacher
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Current through the Output Stage
Michael
Given 2V gate to source for the R100 jfet, does this still give you 1.2A through the output stage? If it doesn't, then what current are you getting?
Regards
AnthonyPosted 5th April 2011 at 12:37 AM by Ejam
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I still adjust for around 1.2A through the output stage. The Vgs will depend on the particular sample and should fall into the 1-2V range.Posted 27th November 2011 at 01:22 PM by Michael Rothacher
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resistor rating
except 0R47 and 100R
are 1/4 watt resistor enough?
since i already have 47R/1watt and put it 2 in series to replace 100R, is that sufficient?
i have R100A laying around and got interest to build all Jfet version
which one do you prefer, mosfet or jfet?
best regardsPosted 2nd September 2015 at 10:32 AM by crt
