Hi, Looking for some help. Power supply is done using a centertap 3wire output transformer with help from the picture with diod reconfig. I am getting 17.8 volts output unloaded with no light from the led. Pulled and rotated led to change polarity no light. As always thanks for you help,
Guycom
Guycom
The LED is probably dead short-circuit.
LEDs run RED ~1.2 -> 3.6V BLUE depending on colour and how hard driven.
Take the LED out of circuit. Measure the voltage at the pads. You should see the full supply voltage or at least a substantial voltage depending on the exact circuit. If this is the case the LED is definitely dead, if not you have an open circuit somewhere.
A small lithium button cell is good for quick testing LEDs without a resistor. They can drive even a blue LED, but cannot deliver enough current to destroy.
w
LEDs run RED ~1.2 -> 3.6V BLUE depending on colour and how hard driven.
Take the LED out of circuit. Measure the voltage at the pads. You should see the full supply voltage or at least a substantial voltage depending on the exact circuit. If this is the case the LED is definitely dead, if not you have an open circuit somewhere.
A small lithium button cell is good for quick testing LEDs without a resistor. They can drive even a blue LED, but cannot deliver enough current to destroy.
w
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.