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Korad KA3005P Fan-Control Mod

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I modded my Korad KA3005P to have temperature control, changed two of the front LEDs and removed the annoying buzzer. In this video I show all the mods that I did to my KA3005P.
Source code and schematic of my mod:
github.com/johndoe31415/tiny1...
Comparison between Rigol DP832 and Korad KA3005P:
• Rigol DP832 vs. Korad ...
Music by www.LukHash.com
Video License: CC BY-SA 3.0

Опубликовано:

30 мар 2018

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Комментарии : 42

@steveholvoet6058 6 лет назад

Excellent mod. Currently running the fan with a capacitor in parallel to cancel out the (ticking) pwm noise, and quite happy with it, but i might give this a go. Nice little project.

@disastermaster2k 2 года назад

If you ever run into the problem that the adjuster knob dances its values all over the place when you try to increase just a tenth of a volt: you need to solder two 0.1uF ceramic caps in series on the 3 pins of the knob to add some filtering (that is required according to spec) and that will solve the problem for like 95%..

@wiedapp Год назад

Can you clarify that a bit further? Serial connection doesn't make a lot of sense in my understanding. Do you mean to put these caps between the wiper pin and each of the other two pins, so one lefty and one righty?

@BurntTransistor 5 лет назад

Thanks for the source code and schematic. Also really nice to see someone programming else Atmel controllers with stock AVR C rather than Arduino.

@ovi_4 5 лет назад

Hi, i am ready to do the mod (PCB already made) but I have a hard time transfering the software to the ATtiny13A since it is not of arduino (.ino) type. I have only ever worked with arduino IDE. This software is a .C file and a make file. I am using a arduino uno board set as ISP programmer and so far i've managed to load a blinking led on the ATtiny13A (via the arduino IDE software) just to verify that the programmer and the MCU are in working order. Now, when it comes to make file and .C file I have no idea what to do. Any help would be much appreciated tnx.

@ohmedarick1 6 лет назад

Thank you for sharing. Very insight full video well done....

@profimax_ru 4 месяца назад

Good idea! Thanks

@74HC04 2 года назад

Thanks for an excellent tutorial! I found that 5mm LEDs are actually too tall and were pushing the front panel window/lens away from the case of the PSU. I think I can see this at approx 7:26 in your video - look at the shadow above the 'adjust' knob. Tbe stock LEDs are an uncommon 4mm size so I used 3mm as replacements.

@fgaviator 2 года назад

Yep, I should have read the comment section (your comment) before. I swapped in 5mm LEDs, only to find out that they are too tall and they would scratch against the front - and the PCB would need to be bent to screw it back in. So I had to replace the LEDs again - now using 3mm LEDs, which worked great. The hint about using bright LEDs was certainly good though.

@TheSir2005 5 лет назад

Cool mod, i wonder if a extra fan would make that whole system a lot more quiet cause there's no airflow in the case what so ever from the looks of it.

@FansSports 5 лет назад

I like the LED light MOD

@glewiss6696 5 лет назад

Hi John, It seems that I got the same version as yours since every components look the same. I noticed thought that in the video of eevblog that the usb control board had opto coupler to isolate the usb signal from the psu main and I don't have like yours this kind of upgrade. Do you know if you got an earlier version or an old one? Thanks

@MegaBakerdude 6 лет назад

Excellent engineering and video. Question - would just replacing the stock fan with the one you chose be an improvement for the average user? Quieter and/or more reliable?

@steveholvoet6058 6 лет назад

MegaBakerdude while not as advanced as this mod, a simple capacitor in parallel to the fan might suite your needs... it reduced my fan noise to acceptable levels. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-RJbagaIx8no.html

@xavierguzmanjr5495 5 лет назад

Excellent mod and very inspiring, thank you! Are you planning to make a completed and programmed controller-PCB available? It could be quite a big hit - the rest of the parts and mods are easy to follow and well within reach of many weekend modders like me, but the ATtiny is not so easy. Thanks.

@user-do3ze3qu6j 5 лет назад

Thanks for the video! Was I impressed! I want to re-upgrade KORAD! 1) In which program You have written code in C? There is a link? 2) What is the algorithm of cooling the cooler? From 16 to 50 *Celsius and with what step?

@user-do3ze3qu6j 5 лет назад

PonyProg -> File -> save as -> hex. Programming Khazama AVR with USBasp. Thanks me!

@photolunatic4552 3 года назад

Do you sell the moded version? I would like to get one of those but not skilled enough to do it myself. Thanks.

@brainlessmoep 4 года назад

5mm LEDs don't work with my Korad as they are too long, Cannot find 4mm LEDs so I used 3mm which need to be positioned quite exactly but then it worked. Why did you solder off the buzzer when you could simply switch it off as described in the manual?

@JAKOB1977 4 года назад

careful, be careful.. its called people'ual and nobody reads the people'ual

@norbertpieper7836 6 лет назад

Good Video and engineering man! Ordered my KA3005P yesterday looking forward to do some mods. Do you think the Fan type "ARCTIC F8 TC" could do the job at once?

@johndoe271828 6 лет назад

Hi Norbert, I used an ARCTIC F8, so I'm pretty certain that the F8 TC would also work as well! All the best with your mod and thanks for the praise :-) Joe

@encryped 4 года назад

Hi Norbert, saw this comment and decided to check whether the F8 TC works. And it works great, at idle and low load it's spinning at 500rpm. I've glued the thermistor to the heatsink and above 32°C it will start spinning faster. It's super quiet now, thanks for the suggestion

@norbertpieper7836 4 года назад

@@encryped Yes, have the F8 TC inside since 1 year, it works raelly great.

@nikolaykamerrer7659 6 лет назад

Nice video and mod man! What about making PCB in KiCad software for example?

@johndoe271828 6 лет назад

Hi Nikolay, thanks for the compliment :-) I thought about doing a PCB (albeit I'd probably do it in CircuitMaker, I'm not a big fan of KiCad to be honest), but didn't know if it was useful to enough people to warrant creating one. Do you think so? I definitely consider doing it (also because it can be used in more applications than just the Korad supply).

@BurntTransistor 5 лет назад

@@johndoe271828 If you end up making a PCB, I'll buy one off of you

@fusca14tube Год назад

Hi... awesome mod! Is there a way to change the unused M5 LED to control the Lock function? So, when the keys are locked, the LED is turned on. Thanks.

@Aptypka84 4 месяца назад

м5 used - press M4 and turn the encoder to the right.

@steffenadamski2786 6 лет назад

Hi, the blue resistor R3 is blown on my device (mounted on the upper edge of the board shown @min 4:00 - 4:08) could you tell me it's value, so i could replace it.

@johndoe271828 6 лет назад

Hi Steffen, sorry for the slow response, was on vacation last week. You're in luck, I still have one open and could quickly measure. R3 is 10 Ohms 5%, probably 2W. Colors brn blk blk gold. Good luck with your repairs!

@steffenadamski2786 6 лет назад

Thank you so much, hope to get it working again.

@user-do3ze3qu6j 5 лет назад

@@johndoe271828 please, Pay your attention 1) In which program You have written code in C? There is a link? 2) What is the algorithm of cooling the cooler? From 16 to 50 *Celsius and with what step?

@ovi_4 5 лет назад

Hi, really nice mod you have there and I'm willing to try it on my PSU and made a PCB ready for the programming part. Now here is where I'm stuck. I only ever used arduino and the IDE software (.ino files). But your software is a .C file and a make file. Now, the question is how you programm the MCU using this type of files?. Since I am an absolute beginner when it comes to programming MCU's any help is much appreciate . Ive set an arduino uno as ISP programmer and managed to load a simple blinking led on the ATTiny13A chip just to verify that the chip is working. I've used the arduino IDE software.

@johndoe271828 4 года назад

Hi Ovi, I haven't used Arduino at all so far -- so with the Ardunio IDE I think I cannot help you. However, you don't need to do any Arduino work and can simply directly flash the firmware image ("main.bin" in the binary/) tree on the ATtiny13. You don't have to bother at all with compiling anything then! HTH, all the best, Joe

@marsa74 3 года назад

Great mod. Didn't have the time to apply it to mine but, yes, holidays are ahead. Since you use already a micro controller. What about feeding back the noise level (via a cheap mirophone) and let the software learn the best cooling strategy?

@BootedTech 3 года назад

Was looking at this power supply, but the fan noise was putting me off. Might get it and just add a thermal resistor sensor circuit attached the to heat sink driving the fan and a better low noise fan.

@mk6595 2 года назад

Korad has updated the power supply several times. I bought mine in Oct 2020 and the fan is pretty quiet.

@limebulls 2 года назад

Hey I would like to buy a modded KA3005P from you, is this possible? Would be AWESOME!

@MissingClara 5 лет назад

You could just have disabled the buzzer in the power supply, no need for removing it.

@user-eh6ee2kz9q 4 года назад

alfa-psi Yes, remember, only beep when press OCP

@rolandwelte4915 3 года назад

Nice hobbyist project, and don’t get me wrong, but it’s such a total overkill. As has been said here before, get a 50 degrees C thermostat switch (normally open) for about $2 at Amazon or wherever, screw it onto the heat sink and solder it into one of the wires to the fan.