Shared Projects

https://github.com/simonlc/zn2stereo

Breadboard adapter for E-Switch series JS1400 surface-mount joystick switch. Solder on the joystick and a couple of male header connectors, and you’re done! The datasheet for the switches is here: https://sten-eswitch-13110800-production.s3.amazonaws.com/system/asset/product_line/data_sheet/22/JS1400.pdf.

NOTE: I have not built and tested this board. The switch datasheet is NOT clear about the location of the big/small mounting holes relative to the switch orientation. So, maybe it is backwards. If so, you can still use it but the pin labels will be wrong. Or you can drill the small hole bigger so that you can mount the switch the other way.

dragonfly04 male-to-female passthrough that puts an ammeter in the circuit. Passthrough for i2c as well through two qwiic/stemma 4 pin jst/sh connectors

Schematic: https://www.phys.hawaii.edu/~mza/PCB/misc/ammy.revB.schematic.pdf

Fits right angle or straight headers, but note the orientation or you will be sad.

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.

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

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 version 2.1 layout from this same schematic, and the original perfboard prototype both v2.0 & v2.1 came from, work great on 3-9Vdc. PCB meant for soldering practice for club members - eventually. V2.0 is as-yet untested but fully expected to work, IF they’re not too heavy-handed with the soldering iron on these fine traces. Only changes from this to the tested & working v2.1 are thicker traces, a few components moved/shifted to optimize space for 3 [irregularly-placed] mounting holes, power plug is centered on the side and one hole/pad grounded, and the trace routing to match the few component moves. Same dimensions/cost and BOM.

• ToUpdate - schematic & a v2.1 derivative link (eventually)

• 3 each 100K resistors (R1-R2-R3)

• 1 each 10K (R4), 4K7 (R5), 2K2 (R6), 100R (R7) - all can be 1/8w except this last one if running on >5v

• 22uF (C1), 47uF (C2), 100uF (C3)

• 2x 2n3904 (next to each other) + 1x 2n3906 (separate) - equivalents acceptable

• 2 LEDs that will look like the eyes you want, space onboard left for 10mm round jumbo type

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

May be updating/sharing the version 2.1 derivative of this before the month is out. 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 … (pun-intentionally) … viable.