just another update, fortunately i've got from a friend another shunt HV board made by Quang Hao (thanks Piero7), populated and connected the board in place it works perfectly, with a dummy load (6,8k 10W resistor), changed again the board with the Oliver's one and dummy load again Vout=Vin-2V
for sure i'm doing something wrong, please Oliver and Salas check the pics posted before if everything is in the right place and orientation
for sure i'm doing something wrong, please Oliver and Salas check the pics posted before if everything is in the right place and orientation
HV-Shunt Module schematics
An externally hosted image should be here but it was not working when we last tested it.
of course also removed the heater lifter... please forgive me... are you perfectly sure that you have the desired voltage drop between input and output in your board with everything connected? could you check? because it is very strange for me....
Sure! Stable 170V input and 150V output from my transformer on a 0,1A Tap.
Hello Oliver, there is a preferred point to get the ground line on the tubeizator to be connected to the star ground of the chassis? how do you ground yours?
thanks
I find that the "-" trace on the removed capacitor is the perfect place to put the shunt module GND.
a little update: just swapped the boards, same exact results, adjusting the trimmer result in the same behaviour (Vin=Vout-2v approx.)
any ideas??? i followed exactly the print on the pcb for components positioning.. i'll post a close up, perhaps i'm missing something...
edit: added pics
Not why you're having problems, but you'll need some heatsink paste on those transistors.
used already the "-" , i added thermal paste
i read:
IRF840
IRF9610
MJE350
K170GR
here's my order from mouser
i read:
IRF840
IRF9610
MJE350
K170GR
here's my order from mouser
Mouser No: 757-2SK170GRF
Mfr. #: 2SK170-GR(F)
Desc.: JFET N CHANNEL JFET Vds 10V Idss 3mA
4 € 0,883 € 3,53
4 Shipped 08/10/2010 24676674
Mouser No: 511-MJE350
Mfr. #: MJE350
Desc.: Bipolar Power PNP Medium Power
4 € 0,50 € 2,00
4 Shipped 08/10/2010 24676674
Mouser No: 844-IRF840PBF
Mfr. #: IRF840PBF
Desc.: MOSFET Power N-Chan 500V 8.0 Amp
4 € 2,38 € 9,52
4 Shipped 08/10/2010 24676674
Mouser No: 844-IRF9610PBF
Mfr. #: IRF9610PBF
Desc.: MOSFET Power P-Chan 200V 1.8 Amp
4 € 1,42 € 5,68
4 Shipped 08/10/2010 24676674
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