A simple and versatile adjustable dummy load
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.gitattributes Initial commit. Jan 5, 2013
.gitignore Reworked to use a voltage regulator, added reverse protection diode, … Jan 6, 2013
README.markdown Updated readme. Feb 19, 2013
Re-Load BoM.html Added complete technical BoM and updated schematic as so politely sug… Oct 16, 2013
reload-core-schematic.png Tweaks to schematic. Feb 5, 2013
reload-layout.png Tweaks and new Re:load images Sep 28, 2013
reload-schematic.png Added complete technical BoM and updated schematic as so politely sug… Oct 16, 2013
reload.NPTH.txt Changes to SMD re:load v2; added test fixture May 23, 2013
reload.back.gbl Layout tweaks and updated images May 25, 2013
reload.backmask.gbs Layout tweaks and updated images May 25, 2013
reload.backpaste.gbp Changes to SMD re:load v2; added test fixture May 23, 2013
reload.backsilk.gbo Changes to SMD re:load v2; added test fixture May 23, 2013
reload.brd Added complete technical BoM and updated schematic as so politely sug… Oct 16, 2013
reload.drill.txt Layout tweaks and updated images May 25, 2013
reload.fab.gm1 Changes to SMD re:load v2; added test fixture May 23, 2013
reload.front.gtl Tweaks and new Re:load images Sep 28, 2013
reload.frontmask.gts Tweaks and new Re:load images Sep 28, 2013
reload.frontpaste.gtp Tweaks and new Re:load images Sep 28, 2013
reload.frontsilk.gto Tweaks and new Re:load images Sep 28, 2013
reload.sch Added complete technical BoM and updated schematic as so politely sug… Oct 16, 2013
testbed top.NPTH.txt Tweaks and new Re:load images Sep 28, 2013
testbed top.back.gbl Changes to SMD re:load v2; added test fixture May 23, 2013
testbed top.backmask.gbs Tweaks and new Re:load images Sep 28, 2013
testbed top.backpaste.gbp Changes to SMD re:load v2; added test fixture May 23, 2013
testbed top.backsilk.gbo Changes to SMD re:load v2; added test fixture May 23, 2013
testbed top.brd Changes to SMD re:load v2; added test fixture May 23, 2013
testbed top.fab.gm1 Tweaks and new Re:load images Sep 28, 2013
testbed top.front.gtl Changes to SMD re:load v2; added test fixture May 23, 2013
testbed top.frontmask.gts Tweaks and new Re:load images Sep 28, 2013
testbed top.frontpaste.gtp Changes to SMD re:load v2; added test fixture May 23, 2013
testbed top.frontsilk.gto Changes to SMD re:load v2; added test fixture May 23, 2013
testbed top.sch Changes to SMD re:load v2; added test fixture May 23, 2013
testbed.NPTH.txt Changes to SMD re:load v2; added test fixture May 23, 2013
testbed.back.gbl Changes to SMD re:load v2; added test fixture May 23, 2013
testbed.backmask.gbs Changes to SMD re:load v2; added test fixture May 23, 2013
testbed.backpaste.gbp Changes to SMD re:load v2; added test fixture May 23, 2013
testbed.backsilk.gbo Changes to SMD re:load v2; added test fixture May 23, 2013
testbed.brd Changes to SMD re:load v2; added test fixture May 23, 2013
testbed.drill.txt Changes to SMD re:load v2; added test fixture May 23, 2013
testbed.fab.gm1 Changes to SMD re:load v2; added test fixture May 23, 2013
testbed.front.gtl Changes to SMD re:load v2; added test fixture May 23, 2013
testbed.frontmask.gts Changes to SMD re:load v2; added test fixture May 23, 2013
testbed.frontpaste.gtp Changes to SMD re:load v2; added test fixture May 23, 2013
testbed.frontsilk.gto Changes to SMD re:load v2; added test fixture May 23, 2013
testbed.sch Changes to SMD re:load v2; added test fixture May 23, 2013

README.markdown

Re:load

Re:load is an adjustable dummy load with the following features:

  • No external power supply required - powered by the device under test.
  • Wide range of input voltages, from 3.3 to 30 volts.
  • Adjustable load from 0 to 3.5 amps (or 0 to 10 amps in the high current version)
  • Up to 14 watts power dissipation (40 watts in the high current version)
  • Virtually indestructible: The power FET, BTS117, has built in overtemp, ESD, and overcurrent protection. A diode protects the opamp from reverse bias.
  • Load remains constant under the whole range of input voltage.
  • Screw terminal and banana plug footprints.
  • Low BoM cost, and easy to solder thru-hole parts.
  • Test points for reading current with a voltmeter.

Read more about Re:load here, buy the regular one here and Epic Re:load here. Assembly and usage instructions can be found here.

BoM

DesignationRe:load PartEpic Re:load partQuantity
Re:load PCB1
Q1BTS117 TO-220 MOSFETBTS141 TO-220 MOSFET1
12 watt heatsink20 watt heatsink1
R13 watt 0.05 ohm resistor1
R610k ohm potentiometer1
IC1MCP6002 8-DIP Op-Amp1
IC2LP2950 3.0v precision LDO regulator1
JP12 terminal 5.0mm spring terminal1
D1BAT42 Schottky Diode1
C233uF Electrolytic Capacitor1
C31uF Ceramic Capacitor1
C10.1uF Ceramic Capacitor1
R3510k ohm resistor1
160k ohm resistor1
75k ohm resistor1
R4, R510k ohm 1% resistor2
R7100 ohm resistor1
Packet of thermal paste1
M3 6mm machine screw1
M3 nut1