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.
