This simple circuit from a 1987 documentation can be used in robotics and automation, as well as being controlled by microcontrollers such as Power Shield. The relay is 5 to 12 V depending on the type of control and for best performance 1k resistors must be connected in series with the bases of the transistors. The control functions are:

E1 E2 Function

0 0 stopped

0 1 inverse

1 0 stopped

1 1 direct

 


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