Varied
Electronic Dog Caller Circuit Schematic
With this electronic dog caller circuit you can call your dog. Dogs can hear audio frequencies higher than humans do. This dog whistle schematic does not guarantee that only dogs can hear the sound, canaries, childs and even some adult peoples might hear the sound.
With 9V supply this power oscillator ( N1 … N3, R1 [...]
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 [...]
Stroboscope, strobo schematic
Attention! This stroboscope circuit is connected to 220V, measurements and experiments are very dangerous even after unplugging. P1 potentiometer must have plastic swivel. The main part of this stroboscope schematic is the lamp with gas discharge in U shape and is filled with xenon. To light the lamp we need 5 - 10kV electric potential.
P1 [...]
