03-13-2014, 07:08 PM
I decided to make an experiment, and lifted one leg of the added 10K resistor that was across the combination of the dropping resistors and the LED.
Result: I was still getting around 23V at point 4C. But sometimes while I was making the measurement, the voltage would suddenly drop to about 0.5V and the LED would illuminate at full brilliance. But when I removed the meter leads, the LED quickly dimmed again. Measuring the voltage showed it had risen to 23V again. If I left the leads on point 4C and ground long enough, the voltage would drop to 0.5V again and the LED would again illuminate at full brilliance.
It is as if it needs a shunt resistor, but perhaps higher than 10K?
Result: I was still getting around 23V at point 4C. But sometimes while I was making the measurement, the voltage would suddenly drop to about 0.5V and the LED would illuminate at full brilliance. But when I removed the meter leads, the LED quickly dimmed again. Measuring the voltage showed it had risen to 23V again. If I left the leads on point 4C and ground long enough, the voltage would drop to 0.5V again and the LED would again illuminate at full brilliance.
It is as if it needs a shunt resistor, but perhaps higher than 10K?
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Ron Ramirez
Ferdinand IN
