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Old 28th September 2008, 10:04 PM   #1
guycom is offline guycom  United States
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Default Brian gt chip amp power supply?

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
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Old 28th September 2008, 10:27 PM   #2
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LED is dead if you have voltage at its pins and no light either way.

w
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Old 28th September 2008, 10:32 PM   #3
guycom is offline guycom  United States
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I understand. Are there different values for leds?
Thanks Again,
Guycom
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Old 28th September 2008, 10:35 PM   #4
guycom is offline guycom  United States
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I am reading .3 volts dc at the led.
Regards,
Guycom
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Old 29th September 2008, 10:57 PM   #5
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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
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