@W5VO I have to look further into it, but if possible I want to keep it small
@W5VO I am driving some ink jets which are capacitive. The source of the 130V signal is controlled with a power amplifier, MP104 from apex, but I can't change the behaviour of this part
@Eggi Why don't you control the input to your amplifier instead? You say you need to design a "fixed voltage drop", but it seems you just need to command the amplifier to put out less voltage
@Marla I often find in real world activities (not the stack) that dropping a hint and then letting the decision makers brew on it until it becomes their idea is a pretty effective way to get things done (so long as I don't need the credit)
ing:49704127 You're going to have to combine a biased clamp circuit with a voltage multiplier. The voltage multiplier provides the bias voltage, and the clamp combines the AC with the DC.
I suggest you work on this using low voltages and currents until you get the circuit right. Then you can select high voltage parts and move on to your high voltage, death dealing circuit.
@ThePhoton Didn't see the depth on that, I suppose you'd have to stack a few up to get to standard height. Or make a four layer board with the outer two layers clear
@laptop2d My bosses are so boring. They always come up with excuses like "The lead time will increase because the board fab needs to special order the material" to kill ideas like that.
At one point we were going to use blue solder mask to indicate RoHS compliant boards but one of our vendors didn't stock it so they switched to green soldermask with yellow silkscreen.
@W5VO I'm going to see it and that's all that matters
@ThePhoton Luckily the cheap chinese boardhouses (like JLCPCB) are giving a few additional colors these days with no additional cost or time. Black and white still cost more
@laptop2d It's not like blue wasn't available. Just one out of three vendors (major CM's you've likely heard of) didn't stock it. We had customers who complained they didn't get a PCN when the soldermask color changed from shiny green to matte green.
So we had to be a bit fussy about how we specified those details.
