Signal injection.


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Signal injection.

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yorled
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Mar 5, 2011, 8:45 PM

Post #1 of 6 (853 views)
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Signal injection.	Can't Post

How does one test for voltage or inject a signal into a circuit using a variable power supply and where do you put the positive and the negative leads of the supply in the circuit.
For e.g. how could i use a variable power supply to supply my own" POWER ON" signal.

jts1957
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Mar 5, 2011, 10:48 PM

Post #2 of 6 (849 views)
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Re: [yorled] Signal injection. [In reply to]	Can't Post

Pre-set variable supply for voltage you desire to inject (being able to monitor this helps, usually drops a little when connected to circuit), attach ground (black) to chassis ground and plus (red) to point voltage is desired.

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yorled
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Mar 6, 2011, 2:33 PM

Post #3 of 6 (841 views)
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Re: [yorled] Signal injection. [In reply to]	Can't Post

Thanks Jts1957,
But..,what kind of safety measure would you have in place if the original signal, for what ever reason should find itself back into the circuit where you would have already injected the desired signal? Original signal +injected signal = you know!!

jts1957
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Mar 6, 2011, 6:53 PM

Post #4 of 6 (837 views)
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Re: [yorled] Signal injection. [In reply to]	Can't Post

5 volts in parallel with 5 volts equals 5 volts.

5 volts in series with 5 volts equals 10 volts.

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Location: Far, Far Away

yorled
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Mar 7, 2011, 12:30 AM

Post #5 of 6 (830 views)
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Re: [jts1957] Signal injection. [In reply to]	Can't Post

Jts1957,
Is it o.k. for me to understand that the method you shared with me about the injection of a signal in a circuit is automatically done in parallel ,thus,there is no fear of any damage as a result?

jts1957
Veteran

Mar 7, 2011, 1:01 AM

Post #6 of 6 (828 views)
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Re: [yorled] Signal injection. [In reply to]	Can't Post

As long as you're NOT trying to inject into a shorted circuit. Wink

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