Relay HF49FD/005 closes and opens until 240 V AC goes through, then it does not open, staying closed. 3V3 goes from logic unit WeMos D1 Mini. I cannot switch the relay off. It seems like 5V continues to go through the 2N3904 transistor to the ground.
This same diagram works with Songle SRD-05VDC relay, but not with this relay. The load is 240VAC 0.15-2.2vA 3D printer.
- What is wrong that I cannot switch off under AC current?
- Is the 1N4007 diode alright or I should use a 1N4001?