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  1. grizzlybaird

    Transistor as a switch

    Wow!!, thanks OperaHouse, That looks perfect, I'm going away for a week but I will build it when I get home and post the results.
  2. grizzlybaird

    Transistor as a switch

    Thanks OperaHouse for the LM339 idea. Looking a schematic from a Photo detector Circuit using the LM339, I'll replace the Phototransistor with the NPN transistor I'm using now. This should isolate the 3v DC and trigger whenever the pulse is present.
  3. grizzlybaird

    Transistor as a switch

    You may well be correct, I will have a friend at Panavision put it on the scope for me, but my problem will remain the same. I need to keep the pulse signal separate from the power source I'm trying to switch on and off.
  4. grizzlybaird

    Transistor as a switch

    It should be noted that my circuit consisted of only the NPN transistor, all the feeds were wired directly into the transistor. A button cell battery through the Collector and Emitter and the momentary pulse through the Base and Emitter. I've tried to find a circuit design to suit my needs and...
  5. grizzlybaird

    Transistor as a switch

    Thanks Norway2, 2v is probably more than the momentary signal offers. It needs to be a circuit that can be triggered by 1v dc or less. I do appreciate the help, As a member of a similar forum for Steadicam Operators I realize how frustrating it can be to deal with the likes of myself who are...
  6. grizzlybaird

    Transistor as a switch

    Thank you Opera House for your suggestion. I will try building this. Like I explained before, the method I used works but the base voltage might be higher than I tested. It is only a momentary signal so perhaps my multitester doesn't get the full read on it before it turns off. My flawed design...
  7. grizzlybaird

    Transistor as a switch

    As a preface I will declare that circuitry is not my speciality by any means. I work in the Film business as a Steadicam Operator. I'm trying to build a simple relay switch using a Transistor. I have a remote control focus system than has a camera start stop button. The system sends a .5v...

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