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The board has four relays driven by ULN2803 IC. The board works on 12V but the input signal can come directly from microcontroller output working at 3V or 5V to control relays. https://goo.gl/u3R15G<br><br><br>For More Details:<br><br>URL: https://www.pcbpower.com<br>Email: pcb@pcbpower.com<br>Phone: 91 7600012414
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