4 ms·
Many LED bulbs are a simple diode rectifier circuit, essentially with a bunch of LEDs stacked to add up to a total 120V bias voltage. These will blink at 60Hz o
by pitaj 5y ago
Many LED bulbs are a simple diode rectifier circuit, essentially with a bunch of LEDs stacked to add up to a total 120V bias voltage. These will blink at 60Hz or 120Hz depending of if they implement a half-wave or full-wave.
More complicated bulbs use an active rectifier / switching power supply instead.
- namibj 5y agoThose are kinda shit, though. Also, the ones you're thinking of should be capacitive dropper circuits, if I'm not mistaken. There's also the electrolytic-smoothed bridge rectifier variant. BigClive has a lot of teardowns of such light bulbs (and non-bulb-shaped alternatives) with circuit diagrams and explanations. They're really good for learning about the various "cheap LED bulb" designs.