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  • Users: Nuke101
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  1. Nuke101

    Transistor relay driver

    Can someone tell me if the circuit in the link below will work ? Im mostly concerned about transistor Q1 which is supposedly a constant current source. The input is a variable +3 to +12 volts which is meant to turn the transistor switch Q2 "on" which will close the relay contacts...
  2. Nuke101

    555 Timer Calculations

    Hi, my first post.:) In the 555 timer calculations there are some parts of the formula i just cant find much info on. Im referring to these: For a 555 Mono T = 1.1 RC For a 555 Astable F = 1 / 0.693C( R1+2R2 ) My question is, where does the numbers .693 and 1.1 come from ...

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