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0-30volts Lab power supply


pier

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The 10k resistor provides an output voltage range of from 0V to about 34 (but the project can't go that high). Since 100 ohms is 1/100th of 10k then its fine tuning range is from 0V to only 0.34V. The 10k pot doesn't need to be changed.

This is the voltage setting pot which is a voltage divider. I was thinking about adding another fine tuning pot in series with the current setting pot which would change the amount of current and require a lower resistance for the original pot so the total resistance is correct.

Many people found the voltage and current of the project reachs max before the pots are at max. They fix it by adding calibration trimpots in series with the existing pots.

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Yes, bigger and heavier gives a nice feeling when incrementing the voltage. Here are a few examples of crank-type knobs: http://www.surplussales.com/ShaftHardware/Knobs-12.html I am sure you could find many more of a similar type at other suppliers. The finger hole knobs are often used for tuning DX-receivers and other ham stuff.

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