Shared Projects

Made by the team at Board Folk

Sega Nomad Motherboard PCB replacement by RGB Beter for repairing Sega Nomads or for building your own Sega Nomad with donor parts.

Neo Geo AES Motherboard PCB designed by the people at Board-Folk

The custom board does the following for the Micro Macintosh pi project when ATTiny is programmed:

• Mutes all of the Bluetooth power on, connect/disconnect sounds by way of GPIO signals from the pin and timers so you only here the MAC sounds during startup, running and shutdown.

• plays disk insert, read and write sounds by way of random PWM to the MacClock included piezo speaker.

• powers off everything (using a MOSFET) on shutdown (holding bottom right button down) so the pi will shut down and then system powers off so you can leave the tiny floppy inserted (and not lose it). Eject and reinsert the floppy to power back up again.

NFC battle board for measuring power output

Second revision with staggered pins so you can install the programming header without soldering.

An SMD version of BWAK’s awesome SKS64. I designed this because I was having trouble with fitting the ATTINY85 in the ROM socket.

IR markers for RGB-IR backlights.

The Radio Shack Digital Voice Recorder Module (aka VM-1110A, aka ISD-1000A, aka RS #276-1324) was used as the main component of the “guidance chip” prop from the movie “The Rock”. I discovered this while viewing high resolution photos of one of the production props when it went up for auction.

The only other two components are a Takamisawa RZ-12 relay and a Sprague 50uf 16v axial capacitor. With these components I was able to assemble my own version of “The Rock” guidance chip.

I soldered the capacitor and relay in such a way that the digital voice recorder module itself would still remain functional. However to use it I needed a way to interface with it and that is where this PCB comes into play.

The purpose of this board is just to provide a simple interface to the module. It’s centered on an AMP 5650712-1 slot connector which fits the card edge connector on the voice recorder module. On either side of the slot connector are 2.54mm pitch header pins labeled with their functions.

SPK is for connecting a speaker; a generic 0.25W, 8ohm speaker should suffice. The MIC port is for an electret microphone or possibly line-level audio from some other source. PLAYL and PLAYE will trigger playback when the two pins on that port is connected. REC likewise will record audio while its two pins are connected. I use momentary push buttons for these. REC LED can be used to connect an LED to indicate the board is recording. The square pin goes to the anode of the LED. The surface mount resistor labeled R_LED is for limiting current. You could always add your own resistor in series and bridge R_LED.

For power there’s a 5V port on the headers where the square pin is positive and the round is negative, but I’ve also added a footprint for a 2-wire USB port as an alternative means of adding power to the board.

I’ve added holes at the four corners to give you something to use for mounting this to something else. You’ll likely want to use some kind of standoffs to help support the board and elevate it a bit so the pins from the slot connector don’t short on whatever is underneath.

Good luck!

Two signal 5v to 3.3v analog converter with op-amp and low-pass filter. Values I used are printed on the board, but feel free to use whatever you need.

Optical sensing board with phototransistor and LED