You said before that voltage goes up when you reduce current. When your output voltage is right measure Vbe and Vgs on all the semis.
Also try with an easier dummy load 10 to 15k.
See what happens when you up the current. Readings change?
My impression is that something is wrong on your setup and reg is working fine.
I built it many times and it' s difficult to go wrong.
Also try with an easier dummy load 10 to 15k.
See what happens when you up the current. Readings change?
My impression is that something is wrong on your setup and reg is working fine.
I built it many times and it' s difficult to go wrong.
Don't be so harsh Andrew; the moment you make PCBs available you will have to expect that people have some expectation of solder, plug, and play.
However, Andrew is right in that you need to be very careful with these high voltages. Someone should post a little guide of how to first test these regulators once soldering is finished. Dummy resistor, current calculations, etc. This may have very well been done, but I don't know it because I haven't been reading so carefully the thread lately.
However, Andrew is right in that you need to be very careful with these high voltages. Someone should post a little guide of how to first test these regulators once soldering is finished. Dummy resistor, current calculations, etc. This may have very well been done, but I don't know it because I haven't been reading so carefully the thread lately.
@ Iko as you said I expected plug & play but possible is my fault: irf840 not isolated well from heatsink, I do the SSHV p2p and going OK 240V 60mA. Salas posted a PDF for this new version SSHV2, I followed his instructions to make it.
@George, OK I will change all semis for a new set to go fast.
@George, OK I will change all semis for a new set to go fast.
Changed all semis, diodes & burned resistors.
Max. current reached 319mA I read 0,319V across TP, Vout with this current 281V but can low the voltage to 240V the voltage is fixed 281V
If I reduce the Vout with R4 trimmer (used for adjust current) I can reach 240V but the current must reduced to 275mA I read 0,275V across TP
Max. current reached 319mA I read 0,319V across TP, Vout with this current 281V but can low the voltage to 240V the voltage is fixed 281V
If I reduce the Vout with R4 trimmer (used for adjust current) I can reach 240V but the current must reduced to 275mA I read 0,275V across TP
- Home
- Amplifiers
- Power Supplies
- Simplistic MosFET HV Shunt Regs