Reply to "An Easy To Build DIY Trackside Crossing Signal Flasher Module, with Gerbers"

Rod StewartOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

OOPS! I found a small error in the original attachments in my first post. The R3/R4 resistors were shown as 200K; they should be 150K for a 1 Hz flash rate. I attached the modified schematic scan and the BOM in the original post; the only two files affected. The gerbers are not affected. Sorry for the confusion.

FWIW here are the approx. flash rates you should get with various R3/R4 values (with C2/C3 of 22uF):

240K; 0.8 Hz

200K; 0.9 Hz

150K; 1.0 Hz

100K; 1.1 Hz

68K; 1.25 Hz

47K; 1.67 Hz

Bob; thanks for adding the comments on multiple parallel and series LEDs. Good to have that documented here also.

Rod

10/1/193:12 PM

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