I have this problem of making ttl output to act as switch to a 12v external circuit,
here's my setup:
i am using an npn transistor as the switch, from a 12v (6A) power supply, connected to my load (which is a 12 v lamp) which s is then connected to the collector of the npn, the emitter goes to ground, and the base comes from the TTL IC
basing from a diagram i got from a book, i could say it would work out just fine, but what happened in my circuit was, the transistor cannot turn on my 12v lamp. I dont think I have a faulty transistor, coz I've tested it.... I am using a bc845 npn transistor
do I really need a relay(electromechanical) for this one?
is there any way I can work this out without including a relay?
hope you guys can help me with this ...