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Clock singal circuit composed of TTL circuit

2017-01-08 08:49  
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Clock singal circuit composed of TTL circuit
The circuit is as shown, it is composed of four negation gates. The oscillation singal frequency is decided by the parameters of C, potentiometer RP1, RP2. To change the resistance of potentiometer can change the frequency. The adjustable frequency range can reach 20:1. The width of output waves T1 depends on the resistance of potentiometer RP2, and it is the same to output waves T2.