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For more information see fffff.at/liberator-variations/
For 3d models see www.thingiverse.com/thing:142879
I used my hot air rework station (thank you Sparkfun) and removed the failed FETs. I did some slight damage to a nearby screw terminal, but it still seems to work fine, just melted a bit.
Given that this board is just an arduino, I used the arduino relay "how-to" and rigged up a resistor and a PN2222 to a relay (and an identical relay in parallel, because the relays I had lying around were only rated for half the expected current of 2.67 A).
Of the four terminals to the FET package, one is direct to an AT168p "arduino" pin. Two go to the same single terminal on the top screw terminal. The other terminal being +12V. So basically the two pins are connected through the heating element to 12V.
The relay needs +5V too.
I pulled the GND (black) and 5V (red) off the FTDI header (via the back/bottom). And connected the arduino pin (purple)(via now vacant FET pad) to the 2222 (through the 1kOhm resistor). The other two pins of the 2222 connect the relay trigger and ground. The fourth wire (white) goes back to the vacant pad connecting to the screw terminal. That way I wasn't soldering the HBP to anything.
Maybe I should upload some pictures... this explanation is getting hard to follow.
I did make an error, though, deducing that the top "pin" of the FET package was ground. It is in fact the "load". Luckily this error didn't seem fatal, and didn't take long to debug with a meter and fix.
Rather than do this three times, I opted to do it once and switched the barrel heater to the one good FET (which will fail some day) and set the heated build platform to work through the relays.
Crowbar pendant in sterling silver. Created using a 3D print to make a mold, and then performing traditional lost-wax casting.
Read about it here: upnotnorth.net/2012/02/06/question-block_and_crowbar/
Download source files here: www.thingiverse.com/thing:17045
Buy a 3D print here: shpws.me/3Mww
Mold for making my Question block cufflinks.
Read about it here: upnotnorth.net/2012/02/06/question-block_and_crowbar/
Download source files here: www.thingiverse.com/thing:17053
Buy 3D prints here: shpws.me/3Mwu
@3dbenchy #3dprint at maximum build height on an @makerbot #replicator #desktop #3dprinter #3DBenchy #buildvolume 3dbenchy.com See video: ift.tt/1DF0jHI Learn more about 3D printing at 3DBenchy.com
Photo by MBCook www.thingiverse.com/derivative:20695
By Skimbal www.thingiverse.com/thing:12673
CCby-nc-sa
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For more information see fffff.at/liberator-variations/
For 3d models see www.thingiverse.com/thing:142879
3D print of my crowbar pendant, used to make the mold.
Read about it here: upnotnorth.net/2012/02/06/question-block_and_crowbar/
Download source files here: www.thingiverse.com/thing:17045
Buy a 3D print here: shpws.me/3Mww