House
Automatic light dimmer
This automatic light dimmer circuit makes it possible to control a lighting system so that it turns on or off slowly. The cirtuict works this way: when switch S1 is closed, the capacitor C1 is slowly charged. Once the voltage at C1 reaches 0.6, transistor T1 begins to conduct and the LED also begins to [...]
74F13 mini bug transmitter
Take a look at this mini transmitter which can be used as a bug transmitter or for spy transmitter too. It uses a single IC 74F13, one coil, a capacitor, one trimmer, one resistor and ofcourse one electret mic. It is so easy to build and can give you a total coverage range of about [...]
FM antenna amplifier
Use this fm antenna amplifier in areas where the signal reception of FM stations is too bad.
This circuit is just the right thing to do it. It is designed in such a way that the supply current powering it flows through coaxial cable. With this technique, an extra cable to power the fm antenna amplifier [...]
