Circuit Project Electronic

An LM556 dual oscillator/timer, U1, configured as a two-tone oscillator drives U2, a dual 4-watt amplifier. One of the oscillators, pins 1 to 6, contained in U1 produces the upper frequency signal of about 200 Hz, while the second oscillator, pins 8 to 13, provides the lower frequency signal of about 140Hz. Increase or decrease [...]

When a car thief scoping out prospective targets sometimes is the nature of the alarm system will deter them … and definitely a heck of much cheaper than real thing! This stylish set that you can put your own “dummy” awaken together to save some cash and own your car may be in the process! [...]

When steal open automobile door relay K1 and K2 work make have voltage 12V give radio transmitter and origin sound part for mix radio waves steal will deaf anything sound. Because radio high frequency. But car owner will hear the sound , by take handbag very small radio, tune the frequency directly with the frequency [...]