This small control for DC motors up to approximately 1 A uses an operational amplifier that admits equivalent. The transistor can be TIP29 for currents up to 1 A or BD135 for 500 mA.
This circuit is from the 1982 SGS linear integrated circuit manual. The LS776 is not common today,...
This circuit was obtained in an old English magazine from 1976. However, the components can still...
In the figure we have a simple way to obtain (almost) sinusoidal signals from an integrated...