Zweefkees93 t1_ixpuf1d wrote
Reply to comment by irreligiosity in How can I trigger a string of PWM RGB LEDs using a solid state relay without introducing resistance and significantly dimming the LEDs ? by irreligiosity
Here is the schematic.
The mechanical relay and SSR are basicly the same thing. You just need to be sure that it is capable of switching DC. Some SSR's require an AC signal because they switch in the zeropoint. If it can switch AC it doesnt matter where the LED's are. (between plus and relay, or between relay and minus)
Mosfets can switch waaayyyyy faster. And dont wear out if you switch them a thousend times a second for 20 years. (yes, thechnicaly there is some wear by flowing current thrue the substrate. But in thes application its completely irelevant. This becomse relevent when the conductors with is counted in atoms instead of mm^(2). ). With mosfets it does matter where the LED's are!
Be carefull when selecting the mosfet you use. Like I said, low R^(on) means more efficient and less power (brightness) loss. The voltage on the gate should be below the max gate-drain voltage. But 12v is usualy ok. And P-channel mosefts tend to be more expensive and have a bit higher R^(on) value.
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