LED Indicator Resistor Calculator

[A Stuart]

Originally Posted by Richard

..... 2 LEDs in inverse parallel fed by a capacitor at one end.

Originally Posted by Phil Y

Not seen the capacitor addition ....

Phil, just to clarify, this (diagram attached) is how I interpreted Richard's description. The capacitor acting to limit the current, in similar role to the resistor but not producing waste heat, rather than being employed to smooth flicker.

[Richard]

Yes that's the drawing Alastair. I wonder if the 2 leds were physically close together you'd get less subjective flicker as they'd each light for half a cycle opposite to each other er.. sort of push-pull LEDs?

[A Stuart]

Push-pull ones exist but as far as I can see only with different colours. Don't know if this would show as a single mixed colour, or an even more annoying two-tone flicker in the corner of your eye. Two separate adjacent LEDs might be the worst combination as it could appear to move as you moved your head.

[Phil Y]

Thanks Stuart, I've never seen that before.

Phil.