This highly sensitive circuit causes one relay to be closed when the other is open or still operating with solenoids, switching with the change in the control level at the input. The circuit has input compatible with TTL and CMOS logic and can be powered separately by voltages from 5 to 12 V. The controlled relays or solenoids can have currents up to 500 mA. The circuit is from the book Robotics, Mechatronics and Artificial Intelligence by Newton C. Braga, published in the United States.
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