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.
We found this configuration in a 70s American documentation. The circuit makes use of operational...
The circuit shown is powered by 5 V and was suggested by Motorola's Linear Databook of 1990....
This simple transistorized intercom circuit was found in a 2000 documentation. It can be powered by a...