I recently purchased this signal relay board.
When Input 1 and Input 2 are at 3.3VDC, both D1 and D2 illuminate.
Here is my set up,
+3.3VDC for IN1 as well as a separate +3.3VDC for IN2. For VCC we are feeding with +5VDC. Each +3.3VDC input line has more than 20 mA of drive strength, but the relays do not trigger as expected. If we apply +5VDC to to IN1 or IN2 for the relays which do not work with +3.3VDC, the relay triggers as expected.
Can someone review on my set-up and confirm that both relays should indeed be working as it's set up like this?