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Reply to "PW Whistle Detection Circuit"

stan2004 posted:
JTrains posted:

I’m looking to build a few whistling accessories in the Post War style that respond to the classic whistle activation DC offset.  In place of the usual whistle tender relay, I’d like to build a discrete circuit. 

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Well, before releasing Gerbers I think it prudent to define the goal.  As I understand the OP, the idea is to replace the obsolete and somewhat finicky Post War relay with a solid-state equivalent...just as the ERR Hobby Corner page describes.  So is that it?  Is the objective just to convert this to an OSH Park ready design to get the bare boards for $2 (free shipping)?

 

If one of the "whistling accessories" is indeed a 1.5V horn battery circuit, that might be a fun project.  I don't have such an accessory myself but I suppose there might be some benefit to cramming the DC offset detector and battery-replacement within the confines of a D holder(?).

Hehe...wow, did this thread blow up (in a good way) while I was in client meetings this afternoon!  My original vision was trying to actuate old PW, high (relatively speaking) amperage AC whistle units - not a 1.5V DC PW horn.  That being said...having the ability to optionally power a PW DC horn would be pretty sweet.  I had not heard of the TrackBat before this - but that was also on my long list of things-to-try-and-build for a couple of diesels I have that don't have horns.  And adding in capability to alternatively sound a bell with reversed polarity input would be icing on the cake.

And making this an easily-order-able PCB would IMHO be a great thing - I was trying to find something like that I could build before posting the question.  I'm just a tinkerer - but if the group wants to take it to another level, my guess is that others would really benefit as well.

Last edited by JTrains

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