On 08/22/2015 11:55 PM, drlegendre . wrote:
I've also seen C-R series voltage dropping circuits, here & there.
Correct me if I'm wrong, but doesn't the series cap dissipate power
just as it would, were it a series resistor? I mean, if the LED is
passing 20mA, the cap is also doing 20mA - and at whatever the Vdrop
is.
Right? If not, why?
That's correct--but there's the matter of the voltage. Eventually,
you'll see that the brightness of the LEDs will drop fairly rapidly
before the thing is useless. A common dodge used by Chinese
manufacturers. Saves a few components, doesn't it.
--Chuck
