Tone generator circuit

Tone generator circuit Tone generator circuit shown in FIG. Circuit uses a quad 2-input NAND gate integrated circuit CD4011. NAND gate NAND gate 1,2 and 3,4 form two gating multivibrator oscillation

period of the former 2s, the latter oscillation period of 330 ms, and the latter controlled by the output of the former, while the former also by control terminal EN potential control. When the EN pin no control voltage, circuit stop vibration HA no sound issue; when EN end when there is a positive control voltage start-up circuit, the role of the two multivibrators, so the output of NAND gate 4 @ pin output every three positive pulse for a group of intermittent square wave, driven by vri buzzer (Xiangqi) HA issued a "drip, drip, clear" crisp tone.

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