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  1. 29-12-2012 #11
    Robin Hewitt's Avatar
    Lives in Seaford, Sussex, United Kingdom.
    Robin Hewitt
    Last Activity: 5 Hours Ago Has been a member for 9-10 years. Has a total post count of 1,617. Received thanks 109 times, giving thanks to others 7 times. Is a beta tester for Machinists Network features. Referred 1 members to the community.
    Quote Originally Posted by manofgresley View Post
    can you recommend a particular NPN transistor, and what is the Resistor rating for the one in front of your 5v mark.
    I am a dinosaur when it comes to transistors, how about a BC547.

    Assuming 20mA to drive the LED and a 1.2 Volt drop across it, about 190 Ohms for the resistor.

    I drew it up to minimise the component count, when the transistor switches on the Volts it has to play with fall away, may need a third resistor so don't lay any PCB's until you have tried it.
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