This is a cricket sound effect circuit which is another Sound effects generator by LM324 op-amp and emits 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.
- 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.
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.
IC1 / 2 generates a 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 generates the 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 a 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.
To apply a 9 volts battery to point “9V” LED lights are the 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
0.25W Resistors, tolerance: 5%
R1, R2, R7, R8, R10, R11, R15: 10K
R3, R9, R12: 5K
R5, R6, R14: 1K
VR1_100K (104 code) TRIMMER POTENTIOMETER
C1: 0.0033uF (on 332 code)
C2: 1uF 50V
C3: 4.7uF 50V
TR1: 2SC458 or 2SC828, 2SC1815, 2SC945
D1, D2_1N4148___75V 150mA Diodes
IC1_LM324 Quad/ 1MHz/ Operational Amplifiers for Commercial/ Industrial/ and Military Applications
Up to $20 shipping discount on first order now: https://jlcpcb.com/quote