jeremybb
New Member
Hi folks, just discovered this place and it looks great. I would like to build a circuit with the following characteristics, and if someone could help out it would be appreciated.
The circuit needs to switch 12VDC (<1A). Normally the output should be high. When a trigger arrives the circuit should wait ~1 second (I would like to be able to fine tune this parameter +/- 50% or so) and then put the output at ground. The output should stay at ground until the circuit is reset by the user.
The trigger is a 12 VDC sine wave at a few KHz. This trigger is going to a cheap buzzer and I would like the buzzer to still function with the circuit attached. If this adds too much complication, I may also have access to a 12V constant trigger.
When the output goes high (at power up or after reset) the buzzer/trigger will go off; this must be ignored, possibly by holding down the reset button?
Finally an LED should be on when the output is high.
Thanks!
-----------------------
In case you are wondering or if it may be relevant: the purpose is to turn off a laser jamming device (http://www.blinder-laser-jammer.com/m_twin.html)
after it has activated. If it matters to you, these are legal where I live.
The circuit needs to switch 12VDC (<1A). Normally the output should be high. When a trigger arrives the circuit should wait ~1 second (I would like to be able to fine tune this parameter +/- 50% or so) and then put the output at ground. The output should stay at ground until the circuit is reset by the user.
The trigger is a 12 VDC sine wave at a few KHz. This trigger is going to a cheap buzzer and I would like the buzzer to still function with the circuit attached. If this adds too much complication, I may also have access to a 12V constant trigger.
When the output goes high (at power up or after reset) the buzzer/trigger will go off; this must be ignored, possibly by holding down the reset button?
Finally an LED should be on when the output is high.
Thanks!
-----------------------
In case you are wondering or if it may be relevant: the purpose is to turn off a laser jamming device (http://www.blinder-laser-jammer.com/m_twin.html)
after it has activated. If it matters to you, these are legal where I live.