With this simple circuit you can control a DC motor with just two buttons. Each of which serves to turn the engine in one direction or another. The device is capable of controlling a powerful motor, and the button contacts will not burn or stick.
Details
Scheme
As can be seen from the diagram, transistors of different conductivity are used, which are connected to each other in a single bridge. Visually, the diagram can be divided into left and right sides, which are identical in structure to each other.
Initially, all the upper transistors are open, and the lower ones are locked. As a result, positive power is supplied to both motor contacts. As a result, the motor shaft is stationary. As soon as you press, say, the left button, the upper transistor in its circuit will close and the lower one will open. As a result, a minus power supply appears on one of the motor contacts, and the motor will start working. If you release the button, the motor will stop.And if you press the right button, the motor will spin in the other direction.
Making a DC motor control circuit
We will make a power bus from thick copper wire.
Solder the transistors with their sources.
Solder a resistor between the sources and gates.
Next, solder the bottom row of transistors. For ease of inclusion, let's turn them over.
Solder the buttons to the lower power bus.
Let's connect the second terminals with wires.
Connect the 12V power supply and multimeter moves instead. And let's try to press one button first.
Then to the second.
The polarity has changed, which means the circuit is working. Let's try it with an electric motor.
Spin one way.
Then to another.
Such a device will find worthy use in everyday life.
