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NAND gate 7400 Siren circuit

2017-08-15 23:27  
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The7400 is a quad 2-input NAND Gate. This means that it has FOUR NAND gates inside and each gate has two inputs.The NAND gate and the NOR gate can be said to be universal gates since combinations of them can be used to accomplish any of the basic operations and can thus produce an inverter, an OR gate or an AND gate. The non-inverting gates do not have this versatility since they can't produce an invert.Two NAND gates are used for the oscillator, and two as the control. If the two-tone speed needs to be altered, the 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.Wiring up any two inputs together (say 1 and 2) means that there is only one input and the output of that gate will become an inverter. and inverter connected to the output of one of the other NAND gates will turn that NAND gate into an AND gate.

7400 Siren