Hi all,
I spent 2 fruitless days trying to trace faults with my indicator circuit.
Cutting a long story short, the fault was eventually traced to the internal wiring of the switch I was using - some of the internal cables had their insulation cut back too far, and when the housing was pressed, 2 wires shorted together meaning that pressing 1 switch activated the output of another.
It seems obvious now, but took me ages to find.
Attached is a photo of the particular switch I had, and a view of the inside showing the offending bare cable (apologies for the lurid spotty tablecloth). I wrapped the bare cable lengths with electrical tape (to save having to de-solder and apply heat-shrink) and now all is good.
Hopefully this saves somebody else some time and grief!
Phil
I spent 2 fruitless days trying to trace faults with my indicator circuit.
Cutting a long story short, the fault was eventually traced to the internal wiring of the switch I was using - some of the internal cables had their insulation cut back too far, and when the housing was pressed, 2 wires shorted together meaning that pressing 1 switch activated the output of another.
It seems obvious now, but took me ages to find.
Attached is a photo of the particular switch I had, and a view of the inside showing the offending bare cable (apologies for the lurid spotty tablecloth). I wrapped the bare cable lengths with electrical tape (to save having to de-solder and apply heat-shrink) and now all is good.
Hopefully this saves somebody else some time and grief!
Phil