I saw the following circuit design posted to Facebook.
Source: https://www.facebook.com/share/p/1HuYVvXHcf/
What is wrong with this design:
No isolation from mains, potentially electrocutes if you touch any part of exposed LED strip.
The circuit will only give around 220V/30000ohms=0.00766.. mA current that can light one normal LED but not any long LED strip like shown in picture.
Most of the power (over 90%) taken by the circuit will end to be power loss on the resistors (0.75W for each resistor) so they will run quite hot.
If you disconnect the LED strip from the circuit, the capacitor will be fried sooner or later.
2 Comments
rose says:
This is a textbook example of what not to do in power supply design—dangerous, inefficient, and agario totally unsuitable for real-world LED strip use.
Lorde Dam says:
I completely agree with the Among Us Online author’s assessment. A circuit that is not isolated from the 220V grid and controls a touchable device like an LED strip is extremely dangerous. This is not a small mistake but a fatal risk. Although the circuit is simple and cheap, it is not worth risking your life to save a few thousand dollars.