Electronic load DIY (constant current)

I made this DC electronic load for testing some power supplies or measuring capacity of batteries. It sinks constant current regulated from 0 to 6 Amps (90W max), so it’s ideal for discharing lead acid batteries with current C/20.

Music: Ahrix – Nova [NCS Release] https://www.youtu.be/FjNdYp2gXRY

Datasheets:
LM78L05 http://eecs.oregonstate.edu/education/docs/datasheets/LM78L05.pdf
TL431 http://www.ti.com/lit/ds/symlink/tl431.pdf
IRF3205 http://www.irf.com/product-info/datasheets/data/irf3205.pdf
BC546/BC547 https://www.sparkfun.com/datasheets/Components/BC546.pdf
The fan and the heatsink is from old PC (on CPU).
Instead of fuse F8A on my el. scheme I used 2 polyfuses for 3A in parallel.

Comments

theengineer72 says:

Very cool idea. Can you make another video explaining the circuitry of the design/function and if is possible to make it say 10 amps?

John Bull says:

Very nice and simple

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