hello eham community.
I'm trying to replace a current meter with a string of 3 green, 24v LED's.
Ran out of space to mount another panel meter.
The purpose is to monitor Control Grid Current on a Tetrode running grid-driven w/DC grounded kathode. I only need a general indicator of current as it should be nearly zero at all times. I estimate 20mA would be equal to "full scale deflection" bright warning light to shut down.
Using an online Current Limiting Resistance calculator, I arrive at a 3w 3.3k resistor. So far so good but what about a parallel Shunt Resistor? All the Control Grid current cannot go through the LED's, right? At least it sounds like a bad idea, I think. IDK, never did this before and LED's are new to me.
It would be prudent to add a Resistor in parallel with the LED string. Anyone have a suggestion or comment?
Neil NYC