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dimming LED strips

MrDEB

Well-Known Member
ran across this schematic and thinking of incorporating into my next sign PCB.
QUESTION maybe a 1K resistor before the gate to protect the gate?
Planning on using a smd pot
 

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What did you choose as Vcc?
Which LED strip you chose?
 
ran across this schematic and thinking of incorporating into my next sign PCB.
QUESTION maybe a 1K resistor before the gate to protect the gate?
Planning on using a smd pot
It's pretty well the poorest circuit you could find - you could only make it worse by losing the FET and using a low value pot.
 
after some research, the most the mosfet will have to handle is approx 5 watts.
The pot will be hard wired to the PCB. The company selling the LED/neon rope lights has a dimmer that can be used. Will consider
 
after some research, the most the mosfet will have to handle is approx 5 watts.
The pot will be hard wired to the PCB. The company selling the LED/neon rope lights has a dimmer that can be used. Will consider
Use their dimmer, presumably it costs hardly anything? - it will be a 'proper' one, not like the crap one from circuits-diy

And 5W is a LOT of heat, and would require a large heatsink
 
You can use a PWM circuit to drive a power FET high (P)ch) or low side (Nch) such as a LM555 PWM with a pot. Then it will be efficient. Choose f = 1k to 5 kHz or buy a proper remote control controller with LEDs is best.
 
Is it Ground Hog day again?
 

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am I reading these data sheets correctly?
portb.3, c.1, c2, are all PWM outputs?
 

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