Shared Projects by Heisenbug

Confirmed Fixed.
A re-work of the original design for a flashlight mod. Larger diameter and hopefully you’ll agree an improved method for making it a break-apart design (some sanding required). See above link for details and the backstory.

Tested, little or nothing to go wrong except in assembly or handling. Use a wide-jaw pliers to carefully and precisely snap off the text tabs first, then snap apart the two halves and sand the edges down as much as you require to fit your own flashlight(s). Add one or both resistors per instructions linked above, and let there be light!

A replacement FT232RL carrier board for my 2-part USB FTDI modular adapter.

Untested | will update | identical layout to the linked full-board design (taken directly from the small region), $3.90 / 3 copies

$50.70 for 3 / untested, will update

Motor driver for big robotics; a slightly-improved clone of a Chinese design. Main difference: added option for 20/26 pin header for easier connection. ~40A, 36V max. recommended.
Probably insufficient heatsinking, but that’s what fits the dimensions I have to work with.
Due to large un-tented vias under each IC, this board may prove to be fully hand-solderable (and even hand-reworkable using only a soldering pencil of sufficient wattage, a solder-sucker, and a dental pick/needle.)

More revisions and improvements likely to come. Common system ground; does not use the +5v line input (yet).

$20.70 / set of 3 - untested (will update)
Motor driver chip good to ~40V / 2A cont (3A pk) and power dissipation limited to 25W or by size of the (probably insufficient as designed) heatsink used.

Screw terminals and Hard Disk power connector used for convenience. Need either a jumper or Rsense across each G/S (ground/sense) terminal pair, and a 7805 ONLY if supplying power solely via +Vmotor. Pads for either PTH or SMD resistor/LED pairs on motor outputs are independent from other half of each H-bridge; BOTH will light if pulled high.
Flyback clamping diodes are DO-214AC package/pads, and should be rated for at least 2A, 40-50V.

$4.45 / set of 3

Physical assembly designed with the intent to be used in more of a vertical orientation, e.g. on a right-angle header plugged into a breadboard.

Batteryless clock module - now more shrinky than the old version!
Features access to all DS1337 IO pins plus a separate IO voltage supply for their pull-up resistors, and accessible connections to both sides of the discharge-blocking diode between the supercap and regulator.

DS1337S on top, Supercap (I chose a 1.5F that happens to have 30+ohm ESR) and 78L05 (SOIC version 5-volt regulator) on bottom, and one or a pair of [low-Vf] diodes makes for a batteryless clock module that will happily keep time with somewhere around monthly charging, on anything from 7+v (using regulator) or can be run direct on 1.8-5v.
Other passives on board bottom include 2 ceramic SMD caps (0.1u suggested) and 3 of the 4 SMD 0805 10k resistors, and on board top, 2 small electrolytic/tantalum, the last SMD 0805 10k resistor and the optional alternate PTH 10k resistor.

Charge session[s] should total 24-48 hours per month for better results with high-ESR supercaps.
The regulator can also power other small circuitry; just keep in mind power dissipation and current rating (~1W or 100mA).