What are the typical voltages and current draws on a model railroad set? Is 12-0--12VAC common voltage range?For non-model-railroaders reading this... the FWBR is needed because the polarity of the supplied power can be reversed. This way the LED will always be forward-biased whenever the polyfuse goes effectively open-circuit.
The power packs I use, which are made by KATO and MRC, put out 0 to 12V with a reversing switch to swap the polarity. Neither output terminal can be considered to be the common side. Using the term DC to describe the output is iffy, because different throttle models use waveforms with a varying amount of pulse content to let the locos move slowly at low settings. I'm building my own which will use straight PWM.What are the typical voltages and current draws on a model railroad set? Is 12-0--12VAC common voltage range?
Okay, I was wrong about DCC voltages, they vary more than I thought. I only work with DC throttles.Even DCC (direct command/control, let's don't go there) is based on 12 volts on the track.
Thank you Alec_t
I don't know how much current the train draws. The output of the transformer is 12-0-12 at 2 amps. I have several 12VDC relays so if that's a better way I would be grateful for any assistance in using them. Incidentally would 1 amp diodes be sufficient for D1 and D2?
1) Bridge diode converts AC voltage to DC (with help of capacitor 3300uF).@ Gopher T
Thank you for your reply. From what I understand in your train circuit the function of the relay on the rhs is to change track direction. I don't recognize the circuit symbol next to the 680m resistor. Can you please explain to me how the circuit works? Thanks.
Use an LM324 or similar (maybe mor modern) op amp that can handle input / output to supply ground.Thank you Gopher T for the explanation. I have never worked with mosfets so the diagram was strange to me. Also your use of millioms and millifarads.
Hello gents;Gopher T
Thank you.
by Jake Hertz
by Duane Benson
by Duane Benson