Hello,
I cannot manage to make a proper setup according to the user manual prescriptions.
At 1st powerup, I get LD1 flashing once (ok, 50Hz) ans LD2 flashing 3 or 4 times. Then LD1 flashing every 5 seconds.
In order to set the 0VDC point, no way to have LD1 flashing. It is either out, or on steadily not very far from the left end of RV1.
Trying to set up the upper DC level (4.8V) fails : LD1 is continuously on, whatever position of RV2.
I made a stupid mistake for the first trial, inverting polarity of the DC input. But with a lab power supply for the 4.8V, with very low current (around 2mA). I checked subsequently the 1N4148 and the 4N27 LED, they both look to have normal behaviour with a diode tester. I guess there should be no damage elsewhere ?
Regards
Sadhill