DIY Bell For Your Trains of Lionel

[Peter]‘s dad recently rekindled his love for Lionel trains and wanted a bell to keep the crossings safe for O gauge drivers and pedestrians. Using parts he had lying around and a doorbell from the hardware store, [Peter] concocted this DIY train crossing bell at his dad’s request.

The idea was to make the bell chime about once per second. To achieve this, [Peter] used a non-repeating electro-mechanical doorbell that emits a single note on continuous press. You could also roll your own bell with a spring-loaded solenoid and something bell-like for it to strike.

[Peter]‘s three-stage design uses a full-wave bridge rectifier to convert the AC from the train transformer to DC. He drops it to 5V and sends it through a 555 and some resistors to set the frequency and duty cycle. His output section translates the voltage back up to match the input desired by the doorbell.  [Peter] included a 1N4002 as a back EMF snubber to keep feedback from damaging the power MOSFET. Stick around for his demonstration video after the jump.

Comments

  1. echodelta says:

    A solid brass bell and cast frame with adjustable screw! I would like to go to that store. Probably pre-war.

    • Wireb says:

      Yea the HAD summery is off. That particular bell came from my scrap pile. Not exactly sure where I got it but it was used and I have held onto it for the last 15 years at least. (been through at least two moves based on the box I got it out of.)

      Since that is a one of a kind I had in the article you can get a functional replacement at a hardware store in the form of a door bell / chime.

      Sorry for the confusion.

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