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TTL gates oscillators Siren circuit

2016-08-14 22:25  
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Transistor–transistor logic (TTL) is a class of digital circuits built from bipolar junction transistors (BJT) and resistors. It is calledtransistor–transistor logicbecause both the logic gating function. and the amplifying function are performed by transistors (contrast with RTL and DTL).TTL is notable for being a widespread integrated circuit (IC ) family used in many applications such as computers, industrial controls, test equipment and instrumentation, consumer electronics, synthesizers, etc. The designationTTLis sometimes used to mean TTL-compatible logic levels, even when not associated directly with  TTL  integrated circuits, for example as a label on the inputs and outputs of electronic instruments.The siren consists of two oscillators which generate the tones. A third oscillator is used to switch the others on and off alternately, giving the two-tone effect.By changing the capacitor values different tones can be produced.An  LM380  audio IC is configured as a feedback audio oscillator. A transistor astable modulates this oscillator at a low frequency.

Siren uses TTL gates