06-05-2024, 04:01 PM
My main comment on that circuit is that it's an odd way to get HT. I know the parts are cheap and readily available but the regulation will be awful with that amount of voltage multiplication.
If I had a transformer from an old valve radio around with an HT winding I'd use that. If I didn't, I'd probably use a second LT transformer in reverse to step the LT back up to HT. Then use a simple bridge rectifier.
Using optocouplers to switch the power to the DVMs is a clever idea but what's wrong with a switch? OK, you've got to remember to switch it off and on but it's hardly an ordeal.
If I had a transformer from an old valve radio around with an HT winding I'd use that. If I didn't, I'd probably use a second LT transformer in reverse to step the LT back up to HT. Then use a simple bridge rectifier.
Using optocouplers to switch the power to the DVMs is a clever idea but what's wrong with a switch? OK, you've got to remember to switch it off and on but it's hardly an ordeal.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
