Change Pot in Mini Buck Converter

eTech said:

Heh....yeah....the 70's....

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ThomsCircuit said:

One of my fav shows. "Marsha, Marsha, Marsha"

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ThomsCircuit said:

Ive got some white smd leds (FV=2.8-3.2). Want to add them to the input and output. how would i do this when the voltage can vary from 4.5-24v input and 3-21v output?

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eTech said:

I thought you were using a digital display? why would you need an indicator?

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ThomsCircuit said:

i am. i just saw in on a converter and wondered how it was done. I did try looking it up but could not find any definitive information. I also purchased a few dozen about a month ago and thought this would be a good project to use them in.

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eTech said:

Doesn't make sense, but anyway...

Use a simple constant current source, like a current mirror. The load would be the LED.

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eTech said:

Use something like this current limiter.

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ThomsCircuit said:

Thank you. I have all those components in SMD! Except R2. Is that 62r?

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