7400 SIREN


Posted on Feb 5, 2014

Two NAND gates are used for the oscillator, and two as the control. If the two-tone speed needs to be altered, the 220 F capacitors can be changed (larger for slower operation). If the frequency of the oscillator is to be changed, the 0. 2 and 0. 1 F capacitors can be varied and the value of R1 can be increased. To change frequency range between


7400 SIREN
Click here to download the full size of the above Circuit.

the two notes, alter the 1. 5 k (1. 500) resistor.




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