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How to build Cricket Chirping Generator Circuit Diagram

2018-11-14 04:07  
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This circuit generates an astonishingly real imitation of the chirping of the cricket. A suitable audio wave form is generated by IC2 and related components, driving the loudspeaker through Q1. To allow a more real-life behavior, the chirp is interrupted in a pseudo-casual way by two timers built around IC1C and IC1D, whose outputs are mixed into IC1B and further time-delayed by IC1A, driving the reset pin of IC2.

An optional Photo resistor can be wired across this pin and positive supply, allowing circuit starting in the dark and stopping when light is coming, thus imitating the cricket's behavior even more closely. R9 acts as volume control and can be a preset trimmer or a small potentiometer.

Circuit diagram:

Cricket Chirping Generator Circuit Diagram-Circuit diagram


R1_____________330K 1/4W ResistorR2_____________220K 1/4W ResistorR3,R6__________100K 1/4W ResistorsR4_____________Photo resistor (Optional, see text)R5,R7___________22K 1/4W ResistorsR8______________10K 1/4W ResistorR9_____________470R 1/2W Trimmer Cermet or CarbonR10_____________22R 1/4W ResistorC1,C2,C3________47μF 25V Electrolytic CapacitorsC4______________10μF 25V Electrolytic CapacitorC5_______________1μF 50V Electrolytic CapacitorC6______________10nF 63V Polyester CapacitorD1,D2,D3,D4__1N4148 75V 150mA DiodesQ1____________BC547 45V 100mA NPN TransistorIC1____________4093 Quad 2 input Schmitt NAND Gate ICIC2____________4060 14 stage ripple counter and oscillator ICSPKR______________8 Ohm Small LoudspeakerSW1____________SPST Toggle or Slide SwitchB1_______________9V PP3 Battery (See Notes)


The circuit can be powered by any battery voltage in the 5 - 12V range.For optimum results please use a loudspeaker as small as possible.In some cases, the chirp can be improved further on by pressing the loudspeaker against a flat surface, e.g. a wooden table.

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