Relay card for LPT port with ULN2003A IC and 3x NO 2A relay outputs

This is a fairly basic computer operated relay card. Card can be connected into computer’s printer port and it takes control signals from parallel port pins 2, 3, and 4. Operating signals travel directly into ULN2003A microchip, which operates directly 3x Takamisawa A5W-K relays according to it’s control signal. For easy strain relief construction PCB has 6x holes for routing wires through them or using cable ties.

Relay card technical details:

• Operating voltage:
  • Auxiliary 5VDC supply (requires soldering into PCB)
• Outputs:
  • 3x NO (Normally open)
• Output type:
  • Relay (Takamisawa A5W-K)
• Max output current:
  • 2A
• Output connectors:
  • Spring loaded push to release terminal blocks