Electronic schematics, circuit designs
Acoust mice - rat repellent circuit schematic
Most people agree that rats and mices are not welcome in our houses, meantime some of us dont want to hurt this creatures.
Using an CMOS 4047 that is connected in such way it can function as an relax oscillator with frequency between 5 KHz and 30 KHz adjusted with P1.
Unfortunately we can not guarantee that this mice - rats repellent does his job so you got to change the repeller frequency, not allowing mices or rats to get used with the sound.
Active components:
IC1 = 4047 B
IC2, IC3 = 4050 B
T1, T3 = BD 131
T2, T4 = BD 132
D1 … D4 = 1N4001
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High power 200W audio amplifier circuit schematic
TDA 2030 is produced by SGS Ates and is a complete audio amplifier. AB class of the final amplifier cand deliver up to 14W on 4 ohm at a +-14V power supply.
Connecting two TDA2030 thru cheap power transistors we can create a amplifier wich can deliver a higher power. With the components value from the schematic the total amplifier gain is 32 dB. The speaker can be 2 ohm instead of 4 ohm if we use the TIP transistors. With a proper designed power supply this audio amplifier can output 200W.
Active components:
IC1, Ic2 TDA 2030
T1, T3 = BD 250, TIP 36
T2,T4 = BD 249, TIP 35
D1 … D4 = 1N4001
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Infrared transmitter circuit schematic
This infrared transmitter use PWM , puls width modulation.
The transmitter is equiped with LM 567, tone decoder circuit. Audio signal ( at least 50mVvv ) is amplified with T1 and then it is used to modulate IC1. Infrared transmitter frequency is adjusted with P2 between 25 and 40KHz.
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