Hi,
I am wondering if anyone can help me. I need a simple circuit, with as few parts as possible. This is what i need it to do.
When the input goes high (over 2.5 Volts) a 1 second positive trigger is output. Also when the input goes low (below 2.5 volts), a 1 second postive pulse is output. So basically anytime the voltage crosses 2.5 volts (rising or falling) a one second postive output (trigger) is output. I would like the 2.5 volts as the threshhold to prevent false triggering since the input volatge will have noise in it due tom the operating enviroment. The voltage input will be 5 Volts when high, andd less than 200 mv when low.
I need this circuit to trigger a relay for 1 one second everytime 5 Volts is applied to the input and whenever it is removed.
I have looked at Op amps and 555 timer circuits. I haven't found anything that does this. Can these be used to handle the circuits I am looking for?
Thanks in advance.
Drewlio77
I am wondering if anyone can help me. I need a simple circuit, with as few parts as possible. This is what i need it to do.
When the input goes high (over 2.5 Volts) a 1 second positive trigger is output. Also when the input goes low (below 2.5 volts), a 1 second postive pulse is output. So basically anytime the voltage crosses 2.5 volts (rising or falling) a one second postive output (trigger) is output. I would like the 2.5 volts as the threshhold to prevent false triggering since the input volatge will have noise in it due tom the operating enviroment. The voltage input will be 5 Volts when high, andd less than 200 mv when low.
I need this circuit to trigger a relay for 1 one second everytime 5 Volts is applied to the input and whenever it is removed.
I have looked at Op amps and 555 timer circuits. I haven't found anything that does this. Can these be used to handle the circuits I am looking for?
Thanks in advance.
Drewlio77
Last edited: