philip collins
Novice Member
Here is the snubber fitted on the back of the 4 way connector. The resistor on the right is not part of the snubber but replaces a 220 ohm resistor that I damaged when I previously connected the snubber to wrong relay. (oops) Nevertheless all working OK now. See my sketches of the power supply and the Tray switching and sensing. The presence of the tray (sensed when the relay connects to the N/O 5V reference) reduces the voltage to the Op-amp input and tells the uC that the tray is present and this voltage is also dependent on the resistance of the tray. Calibration should be required on a new PCB module to match the software power control to the tray. - Thanks to Ian Scot seen elsewhere in this thread for pointing this out.
Calibration is not required if you are only changing the relay on the PCB and fitting the snubber.
Any comments welcome as usual
Calibration is not required if you are only changing the relay on the PCB and fitting the snubber.
Any comments welcome as usual