paul wrote:
Leave just the 3500V supply run. Disconnect it from the internal power add a resistor and cap powered by a external switching wallwort in the 1 watt range. Brand new meanwell units are $11. These are medical grade not that its required. The resistor is about 470 ohms a 1/4 watt. Dropping 24V to 19V. Use a 470 uf cap on the side of the resistor connected to the 3500V supply. Ground the negative to the chassis so the I pump meter works.
I may have misunderstood what you are doing, but a 470 ohm resistor dropping 19v to 24v will draw from 40 to 51mA, and will dissipate from 0.75W to nearly 1.25W.
If this is the real operating condition, it's not a happy place for a 1/4 watt resistor. You'd really want a 2W or greater resistor there, with some good ventilation around it.
Best regards, Charles _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
