230 VAC LED driver

290

04:50:24

LED driver which transforms 230 VAC rms to 15 VAC rms, rectifies the it to ± 19,5 VDC <- the dimmer circuit and 0,74 VDC -> the dimmer circuit.
When the LED's emit light on max. brightness, the voltage drops to about 17,5 VDC <- the dimmer circuit and 2 VDC -> the dimmer circuit.
The dimmer circuit, consisting of 2 NPN transistors and 2 potentiometers, is used to dim the connected LED's (as far as possible).
When the voltage on the LED's drops under 1,8 VDC they will stop emitting light.

published 7 years ago

hurz

7 years ago

different colors of leds have different threshold voltages, anyway even you put 7 leds of identical color parallel they do not have identical thresholds which results in horrible different current per LED

ElekKai

7 years ago

I've changed the Un values of the LED's a little bit. A few 0,0x V under and over 2 V. It is a bit noticeable that the LED's will not emit light on the same brightness and they will not start emitting at the same voltage level.

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