RODALCO
Well-Known Member
Attached are a few photo's from home made LED indicator lamps for control panels.
These are used in substations and fed from a 120 Volts DC supply.
I have built and tested various types of these LED lamps and we have had no faillures yet over the last year.
Normally 130 Volts, 15 Watt incandescent lamps are fitted but they don't seem to last ( ± 2 months ), especially when the circuitbrakers operate frequently.
The series resisitors used are 5k6 or 6k8 , 1 Watt.
a 1N914 blocking diode is used in case of reversed polarity.
Red Leds are 5000 mCAD Ø 5 mm.
Green Leds are 10000mCAD Ø 5 mm.
Regards, Raymond
These are used in substations and fed from a 120 Volts DC supply.
I have built and tested various types of these LED lamps and we have had no faillures yet over the last year.
Normally 130 Volts, 15 Watt incandescent lamps are fitted but they don't seem to last ( ± 2 months ), especially when the circuitbrakers operate frequently.
The series resisitors used are 5k6 or 6k8 , 1 Watt.
a 1N914 blocking diode is used in case of reversed polarity.
Red Leds are 5000 mCAD Ø 5 mm.
Green Leds are 10000mCAD Ø 5 mm.
Regards, Raymond