Introduction
The power supply works as the package is designed and built but I found the adjustable voltage potentiometers to be very touchy as to getting to an exact voltage desired and a bump of the knob would through that off. While not a major problem, I found it frustrating when wanting the positive and negative voltages to match for a project.
New Potentiometers: https://www.amazon.com/dp/B07MQ7R5C7/?co...
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UNPLUG Power Supply from any external power and disconnect all cables.
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Remove the two #1 philips head screws from the sides of the power supply.
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Take a photograph of your wiring before starting to make sure you get them back correct.
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Using your desoldering equipment desolder the 4 leads going to the two voltage control potentiometers.
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Remove the 2 potentiometers and all their hardware.
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To fix this it was a simple fix of replacing the 2K Ohm standard potentiometers for voltage adjustment with a 10 turn precision potentiometer.
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Insert the new potentiometers in their places.
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Solder all four wires back to each post.
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Put new 10 turn knobs on the front.
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Plug power supply in and test functioning.
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Put cover back on with four #1 philips screws.
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You are done.
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You are replacing VR1 & VR2 which are the 2 K voltage adjustment potentiometers for the variable power supplies. See page 18 of the pdf
To reassemble your device, follow these instructions in reverse order.
Link to part on Amazon. https://www.amazon.com/dp/B07MQ7R5C7/?co...
