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Diabolical Artificer · 22nd Jul 2020, 6:32 am

Thanks Dave, right, 230uA, sorry, long day slaving away at the bench : ) Am also aware that the MPSA is only a 300v part, the only other thing I have are 500v mosfet's in a TO47 package, doubt they'll be rated for much current though. Really I could do with dropping 100v ish before it gets to the reg, a tap on the HT winding would have been nice, wish I thought of it when i wound the it, peanut!

Will have another crack at this again today.... is my reading of the circuit about right? Not sure how Q2 & 7 operate, I presume D4 is protection but what's D3 doing? Also wouldn't it be a good idea to bung a 100r on the fet gate, i thought this is good practice with mosfet's.

A.

22nd Jul 2020, 6:32 am	#54
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,662	Re: High voltage regulator circuit. Thanks Dave, right, 230uA, sorry, long day slaving away at the bench : ) Am also aware that the MPSA is only a 300v part, the only other thing I have are 500v mosfet's in a TO47 package, doubt they'll be rated for much current though. Really I could do with dropping 100v ish before it gets to the reg, a tap on the HT winding would have been nice, wish I thought of it when i wound the it, peanut! Will have another crack at this again today.... is my reading of the circuit about right? Not sure how Q2 & 7 operate, I presume D4 is protection but what's D3 doing? Also wouldn't it be a good idea to bung a 100r on the fet gate, i thought this is good practice with mosfet's. A. __________________ Curiosity hasn't killed this cat...so far.