The ATORCH "Purple Fan" MOSFET Destroyer and "150W" Load Bank

At this point, having read the title, you can probably guess my overall opinion on this little work of art…

This is a companion discussion topic for the original entry at

(Comments from Blogger)

2018-07-02 by Unknown

The 24C32B is a 2-wire serial EEPROM, 32Kb. The data sheet should be readily available, and they’re quite easy to work with, even without an eeprom programmer.

2018-07-03 by Russell Graves

You’re right - I’ll update the post. Not sure how I missed that, but I was able to find a datasheet for that unit by searching "24C32B EEPROM datasheet."


2018-07-03 by Unknown

I’ll bet the control voltage for the thing is a DAC made from a PWM and crappy RC filter, amplified, then fed to the fairly capacitive FET gate, and for some frequencies the whole mess is not stable.

2020-02-07 by d_t_a

Thanks for the review.

I’m wondering if you happen to review this new model, how accurate (voltage/current) and if it’s “safe” (hopefully not a MOSFET destroyer)…

DL24/P load tester
DL24/P Color 2.4" APP DC USB tester electronic load 18650 battery capacity monitor discharge charge power meter supply checker|Voltage Meters| - AliExpress

2020-02-09 by Russell Graves

No idea. I haven’t really cared to get another iteration of this hardware.

2020-03-17 by Unknown

Really well made blog!
If I were to put some Zeners (15V) across the leads, where should they be? Gate-Source or Gate-Drain? Both directions or how?

I have the DS1054Z scope and have yet to do some tests with the load as well. My friend burned the mosfet in his slightly different version (heat piped sink) likely due to inconsiderate overcurrent.
Regards from Emil N

2020-12-03 by Unknown

Put the Zener across the Gate and Source

2020-12-22 by TechTronic9000

I have the DL24p,I’ve used it a lot of times. It’s the one with single wires that has a voltage drop and thus not very accurate measurement. I just managed to short the mosfet going 2 times over the rated power. It uses a IRFP260N.

2020-12-23 by Pukker

I have also blown my mosfet in the DL24. Replaced with an new ORIGINAL one and now it is working well. The mosfet on the unit has same markings but in a different way as the original and so I think it was an clone. Tested also copy’s which I ordered from Aliexpress (sold as original) and they have an RDSon ten times higher then the really orignal ones.

2020-12-28 by Chris

what would be a better Mosfet Model?

Noticed a question about DL24/P load above. I purchased DL24/P from AliExpress Hidance store two months ago. Needed cheap programmable load for my RC hobby LiPo battery pack discharging, had obsoleted CPU fan in shelf and also due to curiosity. Still didn’t assembled it due to lack of free time. I hope that it will not blow into my face on powering on. By the way thanks for a warning about possible load shorting. Will try to test the load before attaching real batteries to it. Have no wish to torch my house.

Funny that visual interface is very similar to one which various cheap Chinese USB testers have. Most likely they all share the same firmware with modifications for particular appliance. And very likely are made from refurbished electronic components. 200V support for load you described is clearly bogus. I wouldn’t risk even with voltages above 30V. The reason behind these loads IMHO is raised popularity of RC hobbies with a need for small battery pack discharging. And abundance of people who want to test their USB chargers and cables. Which both doesn’t involve voltages above 30V.

Looks like that boost converter ebay link is toast;

Not sure whether it’s worth it to keep them updated, but…

Yeah… ugh. I knew they were changing referrer formats. I’ll have to see if I can figure out how to bulk convert them.