This circuit for a digital module was found in the September 1989 Radio Electronics magazine. The source must be symmetrical to the operational amplifier.
With a touch of the sensor, the output of the 4013 changes state from high to low or vice versa. In...
The traditional circuit was taken from a French magazine Radio Plans that no longer exists but can...
The coil of this analog composite video signal transmitter is formed by 6 or 7 splashes of 26 or...