Circuit diagrams for radio amateurs

Sometimes you want light in the room was burning for some time after switched off by the switch. During this...

Two U.S. Amateurs Myers (W1FBY) and Regrow (WA1LNQ) developed a compact three-element antenna for the range of 20 m. a...

This device (Fig.1) automatically disconnects the load (player, CD player, amplifier, etc.) at the end of the phonogram or CD-ROM...

The signal from the microphone WM, amplified by the transistor VT1, through the resistor R4 is applied to the varicap...

Many motorists know that it is enough to see a small scratch - and rust begins to engulf the car.