"When you try your best, but you don't succeed..." -Coldplay

Hey, listen, we all make mistakes. This time around, our mistake could be your lucky day! This 8 Relay Control Board gives you opto-isolated, logic-level control over 8 channels of relays. Unfortunately, we populated the wrong relays and as a result, the board doesn't operate at 5V as designed. Instead, you'll need to supply 12V to the header labeled "5V 1A INPUT" (This also renders the USB-C power connector useless.) In addition, despite the board having headers for normally-open (NO) and normally-closed (NC) connections, the relays that were populated only have normally-open connections.

If you can make use of these boards, you can get one at a bargain while we get to work on a new batch. The rest of the board's features remain intact: Each relay channel is opto-isolated from its corresponding logic input, the inputs accept both 3V and 5V logic, and a status LED on each channel makes it easy to tell at a glance which relay is energized. All LEDs on the board, including the power indicator, are connected through cuttable solder jumpers so they can be disabled if you don't need them. The relays are rated to 10A/250VAC, making them useful for a lot of power control applications. But be aware that the ground plane runs underneath the relays and is not isolated for high-voltage. They pull about 40mA when energized, so we recommend a 12V 0.5A supply for the coils.

• Control 8 channels of 10A/250VAC Relays
• All Channels are opto-isolated
• Recommended coil supply: 12V 0.5A
• Status LEDs on all channels with disable jumpers
• 3V and 5V logic compatible

• Schematic
• KiCad Files
• Datasheet (Relay JZC-11F/012-1H1)