We found this version of the automotive tachometer in a 1980s publication. Variations from other sources appear elsewhere in this section. The indicator is a 0 to 1 mA milliammeter.
This circuit matches a source of high or medium impedance audio signals with a low impedance...
We found this circuit in an old European documentation. Transistor TR1 can be BC548 and TR2 can be...
This shield for controlling the direction of rotation of DC motors up to 500 mA with BD135 / 6 and...