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Help finding switch that connects a c...

# Help finding switch that connects a circuit when receiving a 5V signal

Jon Young
#1 Aug 29, 2012
Greetings. I need help finding a simple electrical switch for a neurophysiology experiment and I do not have any electrical engineering background. Basically, I need a switch that will connect a circuit when it receives a 5V signal (TTL pulse) from a computer. If anyone could offer any advice on what type of switch I need, it would be greatly appreciated. Thanks in advance for your help.
Jim
#2 Sep 5, 2012
Jon,

To fully answer your question you need to publish the operating conditions of the circuit. Also, a switch controlled by a signal is usually called a relay or contactor. You should provide

1) the signal (5V which you provided).
2) voltage and power that is being switched.
3) timing considerations (i.e., duration of input signal and output response time)
4) switching logic (you probably want the relay to follow the input signal, but there are many other possibilities)

A company that sells what you'll need is
digikey.com (there are many others)

If there is an engineering college nearby you could probably find a student or faculty that would be willing to help out.

Jim
Jon
#3 Sep 21, 2012
Jim,

Thanks so much for your comments. Here are answers to your questions.

1) The signal: 3V DC
2) Voltage: 5.7V DC
3) input: 10ms, output:10ms (Ideally we'd want the input duration to equal output duration)
4) pulse on = immediate relay (closes the circuit)

Any additional guidance would be much appreciated! Thanks again!

Jon

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