Here is the circuit of simple, interesting and inexpensive electronics clapper which produces clap sound, and can be used to control the devices which used clap sound to operate.

Circuit description of electronics clapper

The clapper can be designed and fabricated using the phase-locked loop (PLL) tone decoder LM567. This circuit comprises tone generator, speaker driver and speaker section.

For generating 4.5 kHz signals, voltage controlled oscillator (VCO) section inside LM567 is configured, and to drive an 8-ohm, 0.5-watt loudspeaker (LS₁) a pnp transistor SK100 (T₁) is used. There is precise region behind not using timer IC 555. When switch SW₁ is pressed, the electronics clapper generates 4.5 kHz sound, and transferred to loudspeaker.

PARTS LIST

Resistors (all ¼-watt, ± 5% Carbon)

R₁ = 10 KΩ

R₂ = 18 KΩ

Capacitors

C₁ = 100 µF

C₂ = 2.2 µF

C₃ = 22n

Semiconductors

IC₁ = LM567 PLL tone decoder

T₁ = SK100 pnp medium-power transistor

Miscellaneous

 Battery 9V

SW₁ = Push-to-on switch

LS₁ = 8Ω, 0.5 W loud speaker

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