Hobby diy
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 [...]
Spy Telephone Schematic
This FM spy telephone circuit is mounted serrial with the phone line. When is signal on the wires this transmitter will radiate airwaves thru the wires wich act as anntenna. There is no need for batteries because it got his voltage supply from the phone lines.
There is no need for antenna too, the phone wires [...]
Electronic dog repellent, dog chaser schematic
Electronic DOG Chaser Repeller
The electronic dog repeller circuit produces a discomforting but not harmful, high frequency sound, audible to dogs but not to humans. Help stop the approach of unwanted dogs at up to 15 feet.
It uses 555 circuit at is easy to build, this is a dog chaser schematic that you can [...]
