Cricket voice with buzzer using LM324

This is a cricket voice circuit which is an another Sound effects generator byLM324 op-amp and emit by a buzzer. And they have sound similarly the crickets are singing a couple we've ever heard. In circuit we don't use any microcontroller ICs so you can build easily them and also cheaper.

Technical information
- Use power supply of 9 Vdc.
- Maximum consumption current about 30 mA
- PCB size : 2.25 x 1.57 inch.
- With trimmer to adjust the tone.
- PCB dimensions: 2.25 x 1.57 inches.

How this circuit works.
As Figure 1 is this circuit use IC-LM324, which is the Op Amp IC that has Op amps within 4 units. But this circuit use only three op-amps,another floating out. The three op-amps will be used to as the frequency generator circuit.

IC1/1 generated Tone Generator at frequency about 1400Hz to 15kHz. This frequency depends on VR1, R4 and C1. Which acts set the cricket tone.


Figure 1 is the circuit diagram of the Cricket voice with buzzer

IC1 / 2 generate frequency of about 50Hz. This frequency depends on R8 and C2. Which it serves to control IC1 / 1. To give a voice tone similar to the sound of crickets.

IC1 / 3 generate frequency of about 2.2Hz. This frequency depends on R13 and C3.This frequency to control the IC1 / 1. To sound frequencies for a cricket singing then stop.

Therefore, the sound of crickets is a tone generator circuit 3 sets. Which sends out pin 1 of IC1 / 1 R5 to pass on TR1 amplifier to the speaker on.

How to builds
This projects you can assemble all parts on the perforated board or universal PCB board. As Figure 2 is the components layout and wiring of this projects. And as Figure 3 is a project that I assembled on PCB and success to the next test.


Figure 2 the components layout and wiring


Figure 3 is the complete projects on PCB.


Testing
To apply a 9 volts battery to point “9V” LED lights are bright start - off at rhythmic. The range of LED lights and can be noisy as well. To adjust to the sounds of crickets, high or low, it can be adjusted to VR100K.

As video below is testing this project.


The part list
R1, R2, R7, R8, R10, R11, R15____10K
R3, R9, R12___________________5K
R4__________________________3K
R5, R6, R14___________________1K
R13_________________________47K
TRIMMER POTENTIOMETER
VR1_____________100K (104 code)

CERAMIC CAPACITOR
C1_______________0.0033uF (on 332 code)

ELECTROLYTIC CAPACITORS
C2______________1uF 50V
C3______________4.7uF 50V

TRANSISTORs
TR1_____________2SC458 or 2SC828, 2SC1815, 2SC945
DIODES
D1, D2___________1N4148___75V 150mA Diodes
IC
IC1______________LM324 Quad/ 1MHz/ Operational Amplifiers for Commercial/ Industrial/ and Military Applications

Note: If your friends are interested in this project. You can buy at: