Model RR, LEDs on variable ac input voltage Answered
Led's for ac powered model railroading, to replace incandescent bulbs. Voltage to track varies from 5 to 17 volts AC. Leds will light up, but what is it doing to them. They do not pop like a flash bulb at top voltage. I've rectified some to dc voltage for lights in cars, the variable voltage seems to power them.
Ideally a circuit that put out a constant 3.2 DC volts, with a variable 5 to 17 volt AC input. Or maybe would a constant 3.2 volt AC out would function?
I found that with HO DCC control, a white led with a 1k resistor will function, have not ran them for more than few hours though.
Prewired rectified leds go for around $3.00 each, 5 passenger cars, 2 bulbs each, gets pricey with 4 sets of cars.
Surly someone has gone through this.