Power On.

[jleaman]

Does any one out there have a power on power off schematic that will drive a simple relay.

i would like to get some thing that i can have one switch but do both functions

one press for power on and one press for power off.

to activate a relay to turn on the main part of the amplifier.

any one help..
Please i lost my old one and now i cant find it.

 

[wrl]

Search for momentary switch.

 

[jleaman]

What about the value of this part that is not identified?

what transistor should i use. ?

 

[JOE DIRT®]

any small signal transistor such as a 2n4401 will do....basically the relay coil impedance determines the size (current capability)

 

[li_gangyi]

Tell us what your relay coil's resistance will likely be...from there we can calculate the current draw and the transistor that best fits the job...I guess a TIP31 there will do for any relay..except for those REALLY BIG relays...