Electronics > Beginners
Hiland Power Supply Kit Voltage Spike
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Audioguru:
I cannot open a DOC file. Can somebody look at it to see if there is a schematic?
There are two potentiometers shown as parts that might set the output voltage and current? The voltage pot might be intermittent?
ledtester:

--- Quote from: Audioguru on May 23, 2018, 06:36:08 pm ---I cannot open a DOC file. Can somebody look at it to see if there is a schematic?
There are two potentiometers shown as parts that might set the output voltage and current? The voltage pot might be intermittent?

--- End quote ---

I used this site to view the DOC file: https://www.onlinedocumentviewer.com/Viewer/default.aspx

but I didn't see any schematic.

It is possible the problem is with the voltage pot. Substituting it with a different one would be a good test.
The_Boots:
I don't have any extra pots lying around, but is it really that likely? I'm not saying I shouldn't try it, but the trimmer is the only pot there is as far as I can tell, and I haven't touched it since I first calibrated it. The normal adjustments are all made with the two rotary encoders-- one for voltage and one for current.
Honest question: what is it about the pot that's suspect? Is it just that pots are often the problem, or something specific about its location in the circuit?

Although I really should try tweaking it to see if that changes the freakout points...
ledtester:
Doh! This kit uses rotary encoders not pots for setting the voltage and current.
The_Boots:
Well, I tried futzing with the calibration trim pot and the voltage spikes followed the ACTUAL voltage, not the voltage displayed on the display.
Even though the display said 4.1V, it still spiked when it crossed 4V heading down.
It's also interesting that even if the display says that it's both set to and reading some other voltage, the circuit itself knows better.
I actually also got it to go into constant freakout mode just by messing with the trimmer pot and tweaking the voltage to sit at 12.4V. It was freaking out enough to give my scope a continuous trigger! There's about a 250 ns lag between the pin going high and the beginning of the voltage spike. The spike itself is about twice that.

So if I can get it to freak out only by messing with the real voltage, no matter what the display says the controller is reading, then doesn't that suggest that the microcontroller is probably not the issue? Also, not the R2R DAC-- it seems more like the victim than the culprit here...
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