This circuit was found in the July 1969 Radio Electronics magazine. The circuit controls resistive loads and universal motors with power according to the SCR used.
The filter shown in the figure, suggested by Motorola, operates at a cut-off frequency of 1 kHz,...
This circuit uses an unusual operational amplifier nowadays and has a very low consumption. The...
In this circuit R1 has 2M5, R2 and R3 are 5M obtaining a detection current for the diode of 0.5...