4 channel AC dimer.

[csa02221862]

Has anyone used these or have any comments?

http://www.ebay.com/itm/2pcs-4CH-AC-BULB-LED-Dimmer-Module-Arduino-Raspberry-110-240V-50-60Hz-/121995455296

Thanks,
Richard

[AWI]

@csa02221862 A nice board if you look at the total package. However these are basic triac dimmer circuits (AC) with optocoupler isolation. You need to be aware that the steering circuit (arduino/ raspberry) needs to take care of the zero cross detection and firing of the triacs. It has been discussed a few times on this forum. Basically a circuit like this:

Where the upper part measures the "AC sine wave" (needed only once) and the part below the steering circuit (to be repeated for each channel)

Building it with Ailexpress parts should not cost you more than €/$ 1 per channel. But as I said you don't get the complete assembled package)