Farish Class 37 lights

[RussellH]

All of the new 37's I have work like this - too high a speed required before the white lights will illuminate yet the rear reds work much better. Clearly designed for DCC and stuff the DC users. From a quick look under the hood the leds appear paired meaning the reds one end and white the other share a resistor (there are only 2 resistors). When Iv got some time I'll have a closer look.

Regards
Russ

[EssexN]

Good thread this, if the manufacturer fitted a fixed voltage regulator to run each set of white/red leds the brightness would be constant regardless of the supply voltage to the track. Mind you, the model would cost a tenner more even though the components are only about 25p each. A small price to pay to keep the lights on.

[PaulCheffus]

Good thread this, if the manufacturer fitted a fixed voltage regulator to run each set of white/red leds the brightness would be constant regardless of the supply voltage to the track. Mind you, the model would cost a tenner more even though the components are only about 25p each. A small price to pay to keep the lights on.

Hi

I'm not sure that would work as a voltage regulator would require a higher voltage to start with. For example to get 5v out of a 78l05 you would need nearly 7v.

Cheers

Paul

[EssexN]

Thanks Paul, I take your point. The regulator I had in mind was a surface mount LM317 which is adjustable from 1.8 volts DC upwards and may do the trick. I am going to try it out after the Christmas break on a breadboard using white and red leds.

Cheers
David