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I have a 555 timer and need to activate it with a 30vdc input. Can I trigger the 555 timer when that signal goes from 0vdc to 30vdc? If so, can you please explain how to connect it? All of the circuits I've seen in the past use an active low trigger, and that is not what I need now.
And got the following answer:
You could use a transistor with a 5v power supply, when the voltage swings from 0 to 30 volts it would turn on the transistor whose output would be applied to the input of a 7404 hex inverter. When the input of the hex inverter goes high, the output goes low and then triggers the 555 timer. Hopefully the 0 - 30 volts is either 0 volts or 30 volts and not somewhere in between, otherwise using a relay with a 30 volt coil could be used to switch 5 volts to the hex inverter input.