DIY Constant Current Load finished (pics)

MatajumotorS · Mar 9, 2008

Finished My Constant Current Adjustable Load. It can be used for Battery testig, bulb testing, charging something, anything else ,where Constant Current Load or Source is needed :grin2:

Specs:
Continuous power - 120W
Maximum Power - 150W (Protection @ 160W, and caution @ 135W)
- Thermal protection @ 150W (25C starting) kicks in 5 minutes
Load Current - 0 - 20A (by 10-turn pot) or constant 1A (switchable)
Maximum Voltage - 140V
DropOut Voltage (On Terminals) - 0,7V @ 12A
Thermal protection - heatsink @ 60C
Dual speed fan - Full speed @ >80W
Volt / Amp Meter - 2/20/200 V / A

This projest is based on this schematic from here, protection circuit is based on PIC12F675.

Thanks for looking

gadget_lover · Mar 9, 2008

Nice little project. Looks good.

Dan

MatajumotorS · Mar 10, 2008

Some internals pics:

left side

right side - bat for meter, stabiliser for control board and fan speed "switch"

side view 2, you can see the PIC12F675 here

fet mounting (need to be werry good thermal contact (but isolated)

the control board (forgot to take a pic, before installing)

psu (used witch one was by hand) no need to be so big

biggest load is the fan

hopkins · Mar 11, 2008

Those red wires look ok as Dan says.

JHM · Jan 24, 2010

Just stumbled across this, good job fitting it all in an old PC PSU housing, I also like the re-use of PC heatshink.

Does someone still have the schematic for this? the original link appears to have expired

bitslice · Jun 25, 2010

JHM said:
Does someone still have the schematic for this? the original link appears to have expired

moved here
http://www.analoghome.com/

but he has not uploaded his projects,
try contacting him ?

I'd be interested too

Selectron · Jul 23, 2010

I'm in the process of building a constant current load too, and came across this thread while I was looking to see how other people had approached the task. The original circuit diagram, photos etc. are still available via the Internet Archive, which you will find at: http://www.archive.org/

And that particular project can be accessed from here:
http://web.archive.org/web/*/http://www.geocities.com/hagtronics/load.html

The Internet Archive is really useful, so anytime you come across a dead link it's always worth checking there to see if it was saved for posterity.

DIY Constant Current Load finished (pics)

MatajumotorS

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gadget_lover

Flashaholic

MatajumotorS

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hopkins

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JHM

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bitslice

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Selectron

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