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Diabolical Artificer · 27th Jul 2020, 4:20 pm

Thanks again. After more work am pretty sure my CCS isn't right, the diff amp isn't working right, it's unbalanced and somethings not right round Q2. Q2 is pulling an awefull lot of current.

I pulled out my CCS and subbed it for a resistor as well as subbing R3 for a blue LED so the diff amp is balanced. i've noticed a few odd things happening on the breadboard ( breadboards not the best for HV PSU's) so I could have some oscillation going off, will have a sniff round with the scope tomorrow.

Best, Andy.

27th Jul 2020, 4:20 pm	#72
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,658	Re: High voltage regulator circuit. Thanks again. After more work am pretty sure my CCS isn't right, the diff amp isn't working right, it's unbalanced and somethings not right round Q2. Q2 is pulling an awefull lot of current. I pulled out my CCS and subbed it for a resistor as well as subbing R3 for a blue LED so the diff amp is balanced. i've noticed a few odd things happening on the breadboard ( breadboards not the best for HV PSU's) so I could have some oscillation going off, will have a sniff round with the scope tomorrow. Best, Andy. __________________ Curiosity hasn't killed this cat...so far.