You are purchasing a PCB ONLY, for a Do-It-Yourself Electronic Load project.
COMMENTS FROM CUSTOMER:
"Hi, Just finished assembling the FFA e-Load and it is everything I had hoped for! It is very stable and easy to use. The current sense tracks very well which was a pleasant surprise. I would have found lesser performance to be quite acceptable especially for such an inexpensive device, but this gem functions much better than merely acceptable! A very good design overall. I couldn’t be more pleased! Please feel free to quote me in your reviews if you wish. Thank you so much, Jerry T."
"You have a nice design here and I'm pleased with it. Its going to get put to good use. Might mention that any heatsink other than the one listed will most likely not fit on the board. Thanks for a cool design! - Mike H."
"I finished assembling the load with twin Intel heatsinks and proceeded to nearly blow a hobby Lion battery pack into little pieces. Meanwhile the electronic load was barely sweating. IMPRESSIVE 
😃. For the money, this is a ridiculously capable unit. Thanks! " - Roger
😃. For the money, this is a ridiculously capable unit. Thanks! " - Roger-----
Some assembly required. You will need to buy additional parts to complete this project.
This is an adjustable constant current Electronic Load "Do-It-Yourself Project" used for testing of power supplies, DC-DC converters or batteries. Just dial the knob on how much current draw you'd like (from a few milliamps to several amps), and the electronic load will do it's job of dissipating all that Power (Volts x Current) from your PSU under test. A 12VDC power supply is all that is required by the Electronic Load.
Two heavy-duty heatsinks (typically used in computer microprocessors) with integrated cooling fans are used to keep your power MOSFETs cool, allowing you to dissipate anywhere from a few watts to couple hundred watts of power in a very small package.
Schematic, Parts List and Assembly Instructions for this DO-IT-YOURSELF Project can be found on our website, FiveFish Audio (just google it, as eBay does not allow direct links.)
- Constant Current, Adjustable Current Load
- Two heavy-duty heatsinks with integrated cooling fans
- Two Power MOSFETs operating in parallel
- 10-turn multi-turn potentiometer for fine-control of the current draw
- 12VDC operation, wall wart or equivalent
- Real-world Tested at 60VDC @ 3Amps (180Watts) for 1+ hour
- Real-world Tested at 30VDC @ 6Amps (180Watts) for 1+ hour
- Real-world Tested at 120VDC @ 2Amps (240Watts) for 1/2 hour (DANGER! High Voltage!)
- Heavy-duty terminals for attaching DUT (Device Under Test)
- Read-out of actual load via simple voltmeter, 1mV reading = 1mA current draw
All the parts are easy to obtain and low cost, from eBay (multi-turn potentiometer, Core 2 Duo Intel Heatsinks, BNC jacks, switches, opamp chip, LED, switch, resistors), and the rest of the parts (3 terminal screw-on headers -- optional, 1/4" aluminum spacers) can be bought from Mouser.
Visit FiveFish Audio website for Assembly Guide PDF
fivefishaudio.com/diy/eload/
You are buying a PCB ONLY (Printed Circuit Board), for a Do-It-Yourself Electronic Load project.
Some assembly required. You will need to buy additional parts to complete this project.
If you follow my Assembly Instructions and bought the correct parts listed in the Parts List, this is what you'll end up BUILDING.
DC trace, 30Volts @ 3Amp load testing: No oscillation.
High magnification. Now we just have a tiny residual noise measuring 3mV RMS. This is measured across power supply output, so this also includes the device under test ripple voltage/environmental noise/etc.
Photos and screen captures are great. But a Video Demo is even better. Check it out.
youtube.com/watch?v=Nw80aH2WYxE