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.

Razor" ultra-thin rubberized cups Two Omni directional microphones Provides sound activated protection over 89 dB at 0.02 reaction time Noise reduction rating of 23dB. Operates on 2 'AAA' batteries- Included

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Price: $35.34

Walker's Razor Slim Electronic Muff, Black

(5288)

Razor" ultra-thin rubberized cups Two Omni directional microphones Provides sound activated protection over 89 dB at 0.02 reaction time Noise reduction rating of 23dB. Operates on 2 'AAA' batteries- Included (as of September 21, 2020 - )

Conveniently Includes Cables: 4 Lightning Cables, 1 Type-C Cable, and 1 Micro-USB cable perfectly sized to keep your space organized; Warning: Not Compatible with Cables Not Included Fast and Smart Charge: 6 2.4-amps ports charges cell phones and tab...

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Price: $44.99

Hercules Tuff Charging Station for Multiple Devices - 6 Short Mixed Cables Included for Cell Phones, Smart Phones, Tablets, and Other Electronics - Multi Charger Organizer Docking Station

(4245)

Conveniently Includes Cables: 4 Lightning Cables, 1 Type-C Cable, and 1 Micro-USB cable perfectly sized to keep your space organized; Warning: Not Compatible with Cables Not Included Fast and Smart Charge: 6 2.4-amps ports charges cell phones and tab... (as of September 21, 2020 - )