Vasily Ivanenko has written an article detailing his AF dummy load project: I’ll describe a simple 8, or 4 Ω dummy load to test your home brew guitar power amplifiers. Low cost 16 Ω / 25W wire wound, aluminum shell, chassis mount resistors seem abundant. I got mine on eBay. Wire wound resistors vary in quality, design […]
Dilshan Jayakody has published a new build: The current source introduced in this article is capable to handle current up to 6A with maximum input voltage of 50V. This is an operational amplifier based adjustable current source and it uses LM358 in a general voltage follower configuration. To handle large currents we use four 0.1Ω […]
Kerry Wong built a 400W/100A electronic load using linear MOSFETs: I bought a couple of IXYS linear MOSFETs (IXTK90N25L2) a while ago to test their capabilities when used as electronic load, and the result was quite impressive. So I decided to build another electronic load using both MOSFETs. As you can see in the video towards […]
Dilshan Jayakody has published a new build: This is a quick post to showcase 100W 4 channel AF dummy load which we build to test the output stages of audio power amplifiers. This dummy load use 4, 8Ω 100W wire wound resistors which are available in eBay. In this unit all 4 resistors are mounted on […]
Sjaak has posted an update on his uC controlled dummy load project we covered previously: I finally found some time to check out the UCload project. A couple of weeks ago I quickly soldered the PCB and wrote a quick’n’dirty firmware for it. The basic functionality was working, but it wouldn’t do good for the […]
Sjaak has published a new build, uC controlled dummy load: I’m mostly a digital guy, but I’m wanting to design my own power supply. If I’m wanting to test that i need a dummy load. I got inspired by the re:load (www.arachnidlabs.com/reload ). I added a microcontroller, rotary switch, external powersupply input and the obligatory […]
Debraj built an electrical dummy load to test his power supply and wrote a post on his site detailing it’s assembly: Recently, I purchased a power supply that claimed a max current of 2A and 0~15V. So I wanted to test it. I had a 36 watts bulb (used in motor cycles), but that was too […]
Kerry Wong built this DIY dummy load in a hard drive cooler aluminum case: Basic constant current dummy load using an Op Amp and a by-passing MOSFET is very easy to build and had been made quite popular following Dave’s video on EEVBlog. I happened to have an old aluminum hard disk cooler case collecting dust. […]
Nick designed re:load, a cheap 0-30A general purpose dummy load and posted it in the forum a few months ago. It’s got over-current, over-voltage, and over-temperature protection. While the circuit is similar to many other DIY dummy loads out there, the key to Nick’s safer solution is the usage of the BTS117 smart low side […]
Nickjohnson posted his flexible dummy load project in the project log forum: I’ve been testing Loki’s power supply lately, and hurting for the lack of a good dummy load. There are plenty of flexible dummy load projects out there, but they’re largely over-engineered and on the expensive side. I decided to put together a really simple […]
Another review of ITead’s OverLoad programmable dummy load: All in all, interesting device. The only major flaw I see attm is that instead of using DAC and drive the current value trough mcu they are doing that analogue … I’ll check schematic to see if there is DAC on board at all, but if not […]
Another constant current dummy load. This one is capable of up to 10amps at 40volts. Since I’m planning to build two bench power supplies, I needed to build a current load to test them. So, I’m going to show you my version of the dummy load. Please note that this project was built ONLY using […]
Schematic and source for ITead’s programmable dummy load are now available.
The computer controlled power supply being developed in the forum is progressing nicely. We got a big boost when Fenugrec posted a few circuit simulations based on a common commercial power supply typology. The simulated circuit is now available as an Eagle Schematic. We also transcribed the “Dave sink” constant current load from DaveCAD to […]
We really enjoyed Dave’s video about a junk box constant current load. It can be used to test a number of things like battery capacity, heat sink characteristics. Via Hackaday.