hello again[previous problem changing between inputs and outputs on 14m appear to be resolved-- don't know what I was doing to cause a problem nor what I did to fix]. forgive me this is daft but here goes -- I want my 14m to come on and remain on from a momentary switch . The pic starts up quickly enough from a momentary switch, and an output goes high okay. I'm then connecting this high output through 330 resistor to the base of npn transistor trying to turn it on to take over power of the pic. I'm connecting collector of transistor to battery positive, and emitter to positive of the pic, reasoning that current will flow through the pic to its normal ground. Reasoning is obviously wrong because it doesn't work! Politely!!, any comments on how I can power from a momentary switch and keep it on with a transistor or other method.
If I can get this working, my preferred method is to charge a capacitor with the momentary switch, and use that to power the base of a small transistor, either to turn the pic on directly or else to use that output to power the base of another transistor to turn the pic on. I need maybe 10 seconds of operation of the pic. But I don't seem to be getting even to first base with a transistor
If I can get this working, my preferred method is to charge a capacitor with the momentary switch, and use that to power the base of a small transistor, either to turn the pic on directly or else to use that output to power the base of another transistor to turn the pic on. I need maybe 10 seconds of operation of the pic. But I don't seem to be getting even to first base with a transistor