God bless TCA 05-58541 Benefactor Member of the NRA, Member of the American Legion, Retired Boss Hog of Roseyville , KC&D Qualified
Bob Nelson
I think this is what you want: http://www.electricrr.com/
Then go to HOBBY CORNER,
and pull up the links. There are two simple electronic postwar relay replacements shown. Very simple circuits.
Bobby
If Bobby is right about what you're looking for, the "Solid State Postwar Relay Replacement" circuit looks reasonable. It differs from a relay in that it responds only to a positive whistle signal. I don't see why ordinary carbon resistors shouldn't work. The voltage rating of C1 is much higher than needed; 5 volts should be plenty. It might be a good idea to protect the base-emitter junction of the transistor with a diode (e.g., 1N4148) if a bell signal is possible.
(By the way, the reference designation class letters are a mess: JP should be J, RL should be U, T should be Q. But that won't keep it from working.)
Bob (lionelsoni),
I was looking at the schematic for that circuit, and I don't understand how the whistle motor is connected to the circuit board. Can you explain how the motor is connect to the board? The circuit looks like it would be easy to build.
It goes between terminal S and ground (outside rails).
Why there are two connectors with the pickup connected to both, I don't understand.
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