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.

Leave Comment

characters left:

New Circuits



Popular Circuits

Car Battery Charger
2 Kw flasher with photoelectric control
Frequency tripler
FM Radio Jammer circuit diagram Circuit Schematic With Explnation
Goodman Band Imaging Receiver
motorcycle headlight with single spdt relay
applied robotics
9 Second Digital Readout Countdown Timer