Mouse and Rat repellent circuit using astable multivibrator
The Mouse and Rat repellent circuit using astable multivibrator which use sound waves or ultrasonic so it escaped away. Use transistor and piezoelectric.
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June 21, 2017
Make Cricket Buzzer Generator circuit using LM324
The cricket sound effect circuit which is an another Sound effects generator byLM324 op-amp and emit by a buzzer. And they have sound similarly the cricket
June 18, 2017
UM3561 Sound effect generator circuits
Here is The 4 Sound effects generator using UM3561 and a few parts only. It can make siren, Ambulance sirens, Police car sirens, Fire truck siren and Space
June 15, 2017
Make Police siren circuit using 555 timer, transistors and OP-Amp
This is police siren circuit using 555 IC, with PCB layout, using 2 IC-555 as frequency oscillators and transistor to drive sound to the speaker [...]
May 17, 2017
4011 Tone Generator circuit projects
Here is the tone generator circuit,it is small size. I use IC digital CMOS 4011 quad NAND gate.
May 6, 2017