hey guys. im trying to make a project that will switch a relay on when you send low signal and turn the relay off if you send the signal again after a it does not receive a signal for 10 seconds or so.
in otherwords i want to be able to trigger a transistor that kicks on a relay but if i keep triggering over and over the relay stays on, but if i wait 10 seconds or more and retrigger then the relay shuts off and stays off unless i wait 10 seconds again.
i want the signal to be able to be very low like the speaker output from an alarm clock.
thats a third example.. if i hook the curcuit to an alarm clocks speaker output.. then the alarm can go beep, beep, beep, beep... the first beep kicks onthe relay.. the relay stays on even after i hit snooze to stop the beeps.... then after 10 minutes the alarm ends the snooze period and goes beep beep beeep.. and the first beep shuts the relay off, and it stays off.. until the delay and the process repeats.
sorry for the long winded explanation..
my guess is i need a 555 timer, some npn transistors, maybe a capacitor or two, and a relay.
can someone help me draw up a schematic for this?
i hope so! Thanks for reading,
-Tavis
in otherwords i want to be able to trigger a transistor that kicks on a relay but if i keep triggering over and over the relay stays on, but if i wait 10 seconds or more and retrigger then the relay shuts off and stays off unless i wait 10 seconds again.
i want the signal to be able to be very low like the speaker output from an alarm clock.
thats a third example.. if i hook the curcuit to an alarm clocks speaker output.. then the alarm can go beep, beep, beep, beep... the first beep kicks onthe relay.. the relay stays on even after i hit snooze to stop the beeps.... then after 10 minutes the alarm ends the snooze period and goes beep beep beeep.. and the first beep shuts the relay off, and it stays off.. until the delay and the process repeats.
sorry for the long winded explanation..
my guess is i need a 555 timer, some npn transistors, maybe a capacitor or two, and a relay.
can someone help me draw up a schematic for this?
i hope so! Thanks for reading,
-Tavis
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