How I make the current? - The Hardware
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1 x Stabilized Power Supply DC 24v
A coil transformer is not suitable as the output voltage will move up and down with the rest the installation.
The HDR15-24 makes its job: Amazon Parent: MeanWell Series HDR-15. : Amazon.de: DIY & Tools -
1 x Shelly RGBW2
This will generate a pulse voltage (PWM - 24V at 100% and less when the brightness % is decreased)
See datasheet - Shelly RGBW2
The OUTPUT of the RGBW2 is the Negative side (Important)
The 4-white-channels mode is used
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1 x 1000 Ohm resistor - 2W
The value must be close to 1kOhm, mine is just below 1kOhm
The standard small resistors are getting hot due to the current passing through. (Therefore 2W)
The resistor will reduce the Voltage/current at the entry of the DPM (Very important to not burn the DPM) -
1 x 67uF capacitor - I took a 63V as the voltage will go about 24V and I had this in stock
I’m not sure this capacitor is absolutely necessary, but I preferred to use it to smooth the PWM of the Shelly -
1 x Fuse (Not in the drawing here below - Can be good to protect the DPM
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