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-   -   Power On. (http://www.diyaudio.com/forums/solid-state/20637-power.html)

jleaman 23rd September 2003 03:33 AM

Power On.
 
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 23rd September 2003 06:11 AM

Search for momentary switch.

jleaman 23rd September 2003 06:43 AM

2 Attachment(s)
What about the value of this part that is not identified?

what transistor should i use. ?

JOE DIRT® 23rd September 2003 06:52 AM

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

li_gangyi 23rd September 2003 09:37 AM

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...


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