7400 SIREN

  
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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 - schematic

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



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