Moderator: pebe
pebe wrote:I am not sure what you want. Your first post implied that you had a voltage source and you wanted to operate a relay, depending on what that voltage was. I assumed it was some sort of under-voltage indicator for a battery..
Your later posts suggest that is a 12V source that pulses down to 5V for a 10mS period, and that you want the relay to ignore the pulse. Have I got it right? If so, how often do the pulses occur? And under what conditions would the relay change state?
A bit more info about the actual project would help, then I wouldn't need to guess.
pebe wrote:So would a relay that is off at 0V and on at 4V do the trick?
pebe wrote:No, I am speaking in absolute terms with the voltages quoted relative to the negative terminal/ground of the supply (as is usual).
If this is a turn indicator I assume the signal is normally off, ie. there is no 12V source signal so the input to the SSR would be 0V.
When the indicator is switched on there will be +12V signal applied to the SSR which reduces to 5V for 10ms every 30sec. So there will always be signal of more than +4V when the indicator is on.
In that case if the SSR can tell the difference between 0V and +4Vor more, it will be OK. Do you agree?
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