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Old 23rd September 2003, 03:33 AM   #1
jleaman is offline jleaman  Belgium
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Default 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.
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Old 23rd September 2003, 06:11 AM   #2
wrl is offline wrl  United States
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Search for momentary switch.
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Old 23rd September 2003, 06:43 AM   #3
jleaman is offline jleaman  Belgium
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What about the value of this part that is not identified?

what transistor should i use. ?
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Old 23rd September 2003, 06:52 AM   #4
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any small signal transistor such as a 2n4401 will do....basically the relay coil impedance determines the size (current capability)
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Old 23rd September 2003, 09:37 AM   #5
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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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