The CD4011 has four separate 2-input NAND gates which you can use independently and can use widely than 7400/74LS00.
Inverter
GATED OSCILLATOR
This circuit generate output tone at about 1KHz whane pin 1 is "high"
TOUCH SWITCH
This circuit is high when touch wires touched with your finger.
Note :This circuit should be used battery powered only.
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