This bidirectional motor control was found in an 80's Electronic Engineering. The circuit uses a component of the time and is suitable for motors up to 1 A.
This circuit enables the bilateral command of triacs with the use of low current switches. The...
The figure shows a way to apply gain control to the LM3600 OTA. The circuit is from a Radio...
This configuration was found in a 1990s documentation. Modern operational amplifiers can be used...