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Surface-mount 555 PWM circuit

Posted on Friday, January 17th, 2014 in LEDs by DP

pcb-full

Nick Leijenhorst writes:

I wanted to dim my room LED lighting with a potentiometer, and decided on creating a solution from scratch to make it more fun and educative. I decided to go with the fairly well-known 555 PWM circuit. To decrease size and for learning purposes I decided on using surface-mount components for the first time. The reason I wanted to make this 555 PWM circuit is actually just to see if I could solder SMD components on home-etched PCB’s, and to see how hard it actually is.

This entry was posted on Friday, January 17th, 2014 at 11:00 am and is filed under LEDs. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

One Response to “Surface-mount 555 PWM circuit”

  1. Neat little circuit.

    However if you want to cut down on components even further, try a micro ;-) I find it even
    works out cheaper as well.

    I’ve used a little PIC12F615 before to do PWM using the hardware generator – it just runs a loop, reads a value from an input potentiometer, then sets the PWM duty cycle. You can then do cute things like having a nonlinear response to knob position – I once wanted to control the _power_ delivered to something rather than the _voltage_, so I rigged up the PIC to produce a parabolic response.

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