Shared Projects

9188AC Test board Negative/Postitive voltage test GND Pass through test AC Pass through LCD Info Display

5 Volt Voltage Regulator Backpack SMD Version.

BreadBoard Power Rail LED and current limiting Resistor. Plug this PCB into a BreadBoard Power Rail to see if it is powered up. This PCB uses a 1206 size Resistor and a 1206 size LED.

More information about the project on GitHub

More information about the project on GitHub

5x2 array of TO-39 photodiodes at 12.1 mm pitch, brought out to diffpairs via baluns. DC bias brought in through diffpair and fanned out via 1k/100nF RC filters.

Schematic: https://www.phys.hawaii.edu/~mza/PCB/misc/proto-DUNE-photodiode-array.revA.schematic.pdf

An Arduino shield with a TLC5940 for controlling my larsskj-003 boards.

tandy.wiki/TPDD

4coax:rj45 interface via baluns

use 2 oz copper, 0.8mm thickness

Schematic: https://www.phys.hawaii.edu/~mza/PCB/misc/balance-board-baggins.revA.schematic.pdf

LCD Interface PCB for OpenSprinkler RPi.

I ended up shrinking down this design. I actually prefer the bigger version without the F silk text across the front.

megadrive/ genesis to master system cartridge adapter. It’s a reverse engineered Analogue Mega SG board it offers 100% compatibility with the master system game library via Master system ever drive. Won’t work with all original cartridges as some need instructions from the sms bios at boot up but it works with most.

Swapping a working game to a non working game within 20 seconds or so also does the trick.

Takes a single 4k75 SMD 0805 or THT. Fits the 50P “clone” sega catridge connector off ali express. 4k7 should be close enough I’ve tried both 4k75 SMD 0805 and 4k7 THT.

(Almost) as-laid-out for a demonstration for Engineering club in fall 2019…timely upload, right? At least I beat Halloween this year! The perfboard prototype of this schematic works great on 3-9vDC. PCB meant for soldering practice for club members - eventually. As-yet untested but fully expected to work, IF they’re not too heavy-handed with the soldering iron on these fine traces.

• ToUpdate - BOM/component listing, schematic & a v2.1 derivative link

• 3 each 10K resistors, 1 each 4K7, 2K2, 100R (all can be 1/8w except last one if run on >5v), 100uF, 47uF, 22uF.

• 2x 2n3904 + 1x 2n3906

• Other values and ratings non-critical - try to get close to the values I used for good timing effect, and meet or exceed intended supply voltage for ratings - then it will simply work.

Will be updating this, or the version 2.1 derivative of this, before the month is out. Only changes to v2.1 are thicker traces, a few components moved/shifted to optimize space for 3 [irregularly-placed] mounting holes, power plug is centered and one hole/pad grounded, and the trace routing to match the component moves. Same dimensions/cost and BOM. All holes populated; no-via design - an astable multivibrator and a third transistor as a driver means it’s simple enough that this design technique is … (punintentionally) … viable.

Short & hacky (mostly toward the left end on top view), hope it works out. I spent enough hours looking it over and improving it over a few days, so it ought to!

Goals were to create an SOIC-8 wide/narrow to DIP-8 adapter integrated with:
* an ISP programming port using keyed, shrouded header for IDC ribbon cables - preventing reversed connections
* a 5v LowDropOut regulator
* an LED that won’t hamper programming
* and a transistor driven output able to be (re-)wired for use in a 12v circuit

Application: virtual “button masher” with heartbeat power indicator lamp - code not included, for now.

Will update when order arrives and tests good - anticipated mid-Oct. - then BOM & schematic to be added.

Build d93b23786b4b8f051e5b2f83cb9a313b6fde0fa2