The circuit shown is from the 1977 GE semiconductor manual. More modern equivalent SCRs can be used. R1 must be wire type.
The filter shown in the figure can have its cutoff frequency adjusted between 2 kHz and...
This circuit, which uses a quadruple comparator, was found in old American documentation. The...
This shield for controlling the direction of rotation of DC motors up to 500 mA with BD135 / 6 and...