5V dimming circuit to control 24V LED strip

[sd02720]

I have a simple dimming circuit from a 5V LED lamp which controls light level and color temp.  The original lamp has two strings of LEDs, one warm, and one cool.  The 5V inputs directly to the circuit.  There is a power button, a plus button,  minus button, and a button to control different levels of each color temp to result in a proportional mix.

I would like to swap out the LEDs for my own LED tape, which requires 24V.

Is there a relatively easy way for me to use this circuit to control the 24V LED tape?  I don't need the color changing, I simply want to use the dimming functionality (I have a single-color LED tape...the circuit seemingly outputs a PWM signal in response to hitting the dim + or - buttons)

Any insights appreciated...relative newbie here but good at soldering, learning to use oscilloscope.  Thanks!  Pics attached of existing circuit for reference.

[Manul]

It seems to me that the IC on the PCB must be some kind of MCU, which controls 2 N-Channel mosfets (low side switches) to PWM LED strips.

If the above is correct, then you could take a 5V linear regulator (like a 7805) and use it to power the PCB. Feed the anode (+) side of your LED strip with 24V, with only cathode (-) connected to the PCB (N-Channel mosfet drain). In that case LED strip and PCB is powered separately: LED strip directly from 24V and PCB through 5V regulator. Hope the explanation is clear. Just be sure to check things and confirm assumptions first.

Note: It might be that the mosfets are too low voltage for 24V LED strip. Or they could be too little current. In that case they might get damaged and they might also damage the MCU. So you might need to replace them with more powerful ones.

[sd02720]

Wow, that makes sense.  Thank you very much...I will give it a try and report back.  Too bad there are no more Radio Shacks around, I need to order the regulator.

It looks like such a simple circuit, I wish I knew enough to build it from scratch.  The functionality is perfectly what I need....single pushes on the buttons create a stepped dimming effect up to a minimum and maximum.  A continuous hold on either button gradually dims (or brightens) the LEDs.  It's magic to the uninitiated!

But anyway, it's a throwaway circuit but I only have one shot to make it work.  Either way I'll report back with either a success or a smoke-show.  Thanks!

[sd02720]

Manul, it worked perfectly.  Thank you