Shared Projects

Test for solder paste dispenser

An Arduino compatible derived from https://github.com/dustinandrews/ExtraCore

For modular synthesizers. Converts +/-15V MOTM power to +/-12V and +5V Eurorack power.

Bit more info: https://www.muffwiggler.com/forum/viewtopic.php?p=1818950&highlight=#1818950

There are many suggested values for capacitors in 78xx/79xx circuits so I haven’t specified any particular values, but I have used 22uF electrolytics and 100n ceramics on the boards I have built.

Suitable heatsinks: http://www.taydaelectronics.com/hardware/heatsink/heat-sink-to-220-4-fins-25mm-aluminium-black.html

User Interface for Reefsense

fall 2014 makerspace super science sunday

Revised photodiode amplifier board. Low frequency to 100MHz range. http://lkeng.org/

LF to VHF photodiode amplifier

Breakout board for Kegbot controllers

Breakout V3

Battery Pack Monitor Shield

This is a very simple MIDI splitter box. Sometimes, when you run too many MIDI devices in a chain, you can get errors caused by the slew rate of up to 16 opto-couplers. This Project fixes that by using a Schmitt trigger buffer to clean up the data transitions, and running the data to different units in parallel, instead of strictly in series.

It works best using a 74HC14, or 74HCT14. I’m told you could also use a 74HC04 or 74HCT04, but the Schmitt trigger in the 14 is the main reason for the project, at least for me. The resistors and C2 are all 0805 packages, the 74HC14 is a narrow SOIC14. D1 is the only really difficult part, as it is a tiny package (SOD523). D1 is a 4148, D2 and D 3 are GF1A. R3 is 1kOhm, but all the other resistors are 220 Ohm. The LM78L05 is a TO92 package, because I had it on hand, and similarly, the opto is a DIP6 CNY17. This board is tested, and it worked when I built it.

If you want an “MIDI active” LED, you can simply wire an LED to one of the outputs (do not wire it to a MIDI connector as well - it can’t drive both). The cathode of the LED is wired to pin 5 (the round pad).

Also, don’t forget to wire pin 2 of the OUTPUT MIDI connectors (the center of the 5 pins) to ground. This is for the MIDI cable’s shield. On no account should pin 2 of the input connector be wired to anything.

Thermistor Header PCB

nrf24l01 to pro mini breakout

with FT231X for USB

SDI-12 Break Out Shield for Teensy 3.x with proper level shifting. Also adds a MAX3221 for low power communications with RS-232 devices, REV 2.

Genesis/(S)NES/others joypad/joystick to USB.

Original project: http://www.raphnet.net/electronique/atari_usb/index_en.php

BankWankRX

Accelerometer network module based on the FXLS8471Q. The chip select is shifted through the module to other modules using the D-Flip Flop (used like a shift register). Onboard indicator shows which module is selected.

Signals flow from J1 to J2 (i.e. The next module in the chain gets attached to J2).

J1 Pinout: 1 - Shift Reset (Resets all D-Flip Flops to 0) 2 - FF Clock 3 - Chip Select (Value shifted through the D-Flip Flops) 4 - SPI Clock 5 - SPI MOSI 6 - SPI MISO 7 - VCC (2V - 3.3V) 8 - GND

Rev P1 corrected a mistake with the shift circuit and added labels.