janeceline
New Member
I want to derive power supply for 330 LED's ( 6 rows of 55 LED's in series - Each LED 3.8v DC ). How to derive the circuit ? Any Idea ? Without transformers.
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I want to derive power supply for 330 LED's ( 6 rows of 55 LED's in series - Each LED 3.8v DC ). How to derive the circuit ? Any Idea ? Without transformers.
i want to do it myself the power supply. i want to know the circuit diagram for that. please help
Hi there Jane,
We were talking about an LED circuit the other day that runs off of
220vac mains. It's here on this forum somewhere. It uses a capacitor
and a bridge rectifier to run a string of LEDs. It does not require
a transformer. To run that many LEDs you would use a few separate
strings all driven the same way. Sound interesting?
no... it will blow all the LEDs
Well I did not see about the reversed ones, but that is beside the point. Unless there is a bleeder resistor across each and every LED differing leakage currents will cause them to blow since they will not share the voltage equally.Why? In one half of the AC the LEDs will glow and in the other half 55 LEDs will remain reverse biased. 55 LEDs in series must be able to withstand this reverse voltage. Is it not?
i want to do it myself the power supply. i want to know the circuit diagram for that. please help
Well I did not see about the reversed ones, but that is beside the point. Unless there is a bleeder resistor across each and every LED differing leakage currents will cause them to blow since they will not share the voltage equally.
Be safe. Do it with an isolation transformer if it is powered by mains. Better yet, buy a compliant DC power supply to power your low voltage circuit.
market products use LED drivers, switching current regulators designed specifically to drive power LEDs
A single red or green pilot LED requires only an 56K resistor across 230V. Normal LEDs have low brightness otherwise a bright type must be used. A diode resistance combination can be used for getting good brightness. Here resistance must be atleast 2W type.Well I did not see about the reversed ones, but that is beside the point. Unless there is a bleeder resistor across each and every LED differing leakage currents will cause them to blow since they will not share the voltage equally.
another way around that is to have a single string with anti parallel LEDs all the way up instead of anti parallel strings... or is that what you meant?