(Topic ID: 334016)

Installing voltage indicator LEDs

By PghPinballRescue

1 year ago



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    #1 1 year ago

    Is there any harm in installing a voltage indicator LED (with proper resistor of course) across a filter cap?

    I want to make sure I am not lessening the effect of the cap or introducing additional noise to the circuit.

    #2 1 year ago

    If you can't leave your multimeter connected, a digital voltmeter display might be better than just a simple LED.

    #3 1 year ago
    Quoted from ForceFlow:

    If you can't leave your multimeter connected, a digital voltmeter display might be better than just a simple LED.

    I get what you're saying, but I'm thinking more for the average homeowner with no electronics experience being able to glance at an LED to see if it is lit or now.

    More or less just for over the phone diagnostics.

    #4 1 year ago

    An (LED + resistor) across (in parallel with) a cap will not reduce its capacitance or introduce noise.

    If that were true, then DC power supply smoothing caps would vary the amount of voltage smoothing as the power supply is loaded in various ways.

    #5 1 year ago
    Quoted from sparky672:

    An (LED + resistor) across (in parallel with) a cap will not reduce its capacitance or introduce noise.
    If that were true, then DC power supply smoothing caps would vary the amount of voltage smoothing as the power supply is loaded in various ways.

    Thank you, this is the answer I was looking for and glad to hear.

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