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Transistor "latch" circuit?

  • Anyone know of a simple transistor circuit to be used in place of a latching relay, to indicate the position of a turnout, and thus turning on an LED. That is, the momentary switch for the turnout activates a "continous on" for the LED. Hopefully, it's less expensive than a latching relay. I'm wondering if I explained this very well!
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  • Anyone know of a simple transistor circuit to be used in place of a latching relay, to indicate the position of a turnout, and thus turning on an LED. That is, the momentary switch for the turnout activates a "continous on" for the LED. Hopefully, it's less expensive than a latching relay. I'm wondering if I explained this very well!
  • Need to try the modeling forums. Cheapest/easiest will use two NOR gates wired as a set/reset flip-flop. Another circuit is a SCR, once triggered by a signal on the gate, it conducts until the circuit is broken by a momentary contact.

    We used to have electronics circuits in Model RR mag, someone might know a back issue of that or similar, of hobby electronics circuits.
  • Need to try the modeling forums. Cheapest/easiest will use two NOR gates wired as a set/reset flip-flop. Another circuit is a SCR, once triggered by a signal on the gate, it conducts until the circuit is broken by a momentary contact.

    We used to have electronics circuits in Model RR mag, someone might know a back issue of that or similar, of hobby electronics circuits.
  • Hi, Jim

    I'm looking for the same circuit. Did you find something since this time?

    Thanks
  • Hi, Jim

    I'm looking for the same circuit. Did you find something since this time?

    Thanks