This is one of the more in-depth power supply reviews, well done! There are still some aspects that might be interesting: wiring of the earth connection, are all metal parts properly earthed, more info about the circuit, a bit of reverse engineering of the rather poor control loop, CV to CC transition in operation (not during switch on), ripple and noise (20 MHz), current ripple, transition between the taps under dynamic load conditions, specs and plausibility regarding how much the supply may be floated above/below earth ground etc. But again: This already is much more comprehensive than most reviews… With my soldering station I recently discovered that the mains hum gets really annoying as soon as the station comes close to the metal chassis of a rework station below. Haven’t looked closely at that yet, but I wonder whether it’s the same here.
I appreciate your input and suggestions, especially the one about grounding. I'll keep those in mind for next time. I did test to see whether a dynamic load would cause the supply to cycle between two ranges. That does not appear to be the case (good!).
Really like your videoes, and am now a subscriber. Getting to ordering some of your products, when the current projects are finished. I am a little curious about your current measurement on your scope. What current transformer/Probe do you use? Kind Regards from Denmark Kenni.
The encoder of my korad ka3005p has started to go crazy from time to time, and this can bring sudden destruction to the circuit it powers. When trying to change tenths of a volt, I get several volts jumps.
Oh, wow. That's no fun. You may be able to find a replacement through Mouser.com. Just search for 'encoder' and you'll find a bunch. You'll have to go through the data sheets for the mechanical dimensions to make sure they fit.
I just did my fix, added two caps(mlcc 100nF x2) to encoder pins, the original caps on board are 10nF which are next to the 10pin female connector. The encoder schematic is extremely simple, no external pullup resistors.
great video, your public speaking has really improved.
Thank you. Yeah. I've become a lot more comfortable talking to the camera ... and better at video editing too. :)
This is one of the more in-depth power supply reviews, well done! There are still some aspects that might be interesting: wiring of the earth connection, are all metal parts properly earthed, more info about the circuit, a bit of reverse engineering of the rather poor control loop, CV to CC transition in operation (not during switch on), ripple and noise (20 MHz), current ripple, transition between the taps under dynamic load conditions, specs and plausibility regarding how much the supply may be floated above/below earth ground etc.
But again: This already is much more comprehensive than most reviews…
With my soldering station I recently discovered that the mains hum gets really annoying as soon as the station comes close to the metal chassis of a rework station below. Haven’t looked closely at that yet, but I wonder whether it’s the same here.
I appreciate your input and suggestions, especially the one about grounding. I'll keep those in mind for next time. I did test to see whether a dynamic load would cause the supply to cycle between two ranges. That does not appear to be the case (good!).
@@Neurochrome2010 That‘s good to know!
Really like your videoes, and am now a subscriber. Getting to ordering some of your products, when the current projects are finished.
I am a little curious about your current measurement on your scope. What current transformer/Probe do you use?
Kind Regards from Denmark
Kenni.
I use a little current probe that I made: neurochrome.com/pages/measure-current-with-an-oscilloscope
Thank you for the video. Seems better than the Hanmatek one.
Could this problem be solved this by adding bulk capacitance to the power input of the amplifier?
I tried 10000 uF to no avail.
The encoder of my korad ka3005p has started to go crazy from time to time, and this can bring sudden destruction to the circuit it powers. When trying to change tenths of a volt, I get several volts jumps.
Oh, wow. That's no fun. You may be able to find a replacement through Mouser.com. Just search for 'encoder' and you'll find a bunch. You'll have to go through the data sheets for the mechanical dimensions to make sure they fit.
I just did my fix, added two caps(mlcc 100nF x2) to encoder pins, the original caps on board are 10nF which are next to the 10pin female connector. The encoder schematic is extremely simple, no external pullup resistors.
@@槑 wait, you can fix the encoder with capacitors? I thought the erratic behaviour was due to mechanical problems. I might as well give it a try.
if not this one. What smal linear powersupply do you recommend in lower price range?
The HP 6237 is hard to beat.
that heatsink is extremely cost effective and cheap.
No kidding!