This is one of the many 555 based car alarm circuits that we have on our website. We found it in a 90’s American documentation. The circuit has double timing.
This circuit is more elaborate than the previous one, employing an integrated amplifier circuit of the...
This circuit is from a 2005 Linear Technology application manual. The circuit uses a commercial...
Found in an American paper from the 90's, this circuit can be adjusted to pass frequencies above 30 to 300...