This 5.1 MHz circuit was found in a 1980s documentation. The frequency is given by the crystal and general purpose transistors can be used.
This circuit can linearly control the temperature of showers, taps or heaters up to 2 500 W. The...
The output voltage of this unit is approximately 1.4 V less than that of the chosen zener. The...
The circuit shown is suggested by Motorola and consists of an amplifier with very high input...