3W 230V Watch lamp with LEDs (reverse engineering)
A few years ago, I buy with 0,8EUR an 230V watch lamp with 4 leds.
I made reverse engineering for this lamp:
I made few calculations:
R2 Resistor is put for limit power-up current, when C1 capacitor works as shunt, R1 rezistor discharge C1 capacitor after power down. For more information see article LED light bulb from danyk.cz where you cand find also on-line calculator for this type of lamp…