I stumbled on to Kerry Wong web blog when I searched for some ideas on an electronic load. Kerry also references a tutorial on an Electronic Load for testing batteries by Dave of EEBlog.
Kerry uses a lm324 to drive 6x fets. As I am wanting a lower capability, I will be only be using 3x fets.
I am aiming at the following Specifications:
- Load voltage range: 0 to 30 Volts
- Load current Range: 0 to 10 Amps
- Operation Voltage: 12 Volt
The heat sink is 100x50x15mm. I choose this one as it is easy to retrofit 2x 40mm fans.