7400 Siren

  
Two NAND gates are used for the oscillator, and two as the control. If the two-tone speed needs to be altered, the 220 µ capacitors can be changed Oarger for slower operation). If the frequency of the oscillator is to be changed, the 0.2 and 0.1 /iF capacitors can be varied and the value of Rl can be increased. To change frequency range between the two notes, alter the 1.5 k (1,500) resistor=
7400 Siren  - schematic

To change frequency range between the two notes, alter the 1.5 k (1,500) resistor.




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