RJ45 to Header

This is a small board with a lot of digits. Featuring four HP 4-digit 7-segment bubble displays on a board designed to be mated with the Adafruit HT16K33 breakout, this will quickly allow you to display four values using i²c. Source Files can be found on GitHub.

Note, the board to board connector on this version does not support normal header strip (the holes are too small) either use wire or appropriately sized machine pin connectors such as these.

Mounting:

• Solder a right angle header strip to the bottom header for vertical mounting.
• Solder straight header strips to the bottom or both headers for horizontal mounting.
• The top header is not electrically connected and is for more stable horizontal mounting.

power connection coverter

Constant current source for high-power LEDs

DefCon 22 Hardware Hacking Village Learn To Solder Kit, by:

• Smitty, [email protected] (concept, crypto, and firmware)
• Krux, [email protected] (hardware)

These are the files needed to build the firmware for the DefCon DarkNet ID Badge that was sold as the Hardware Hacking Village’s Learn To Solder kit at DefCon 22 in 2014.

Bill of Materials and Build instructions here:

https://github.com/thedarknet/hhvkit

TI Launchpad Waycool Robot

8 LEDs /w resistors for easy breadboarding

Front end protection for the Saleae logic analyser, allows up to +/-30V bipolar inputs.

Eight channels with series diode and resistor plus zener shunt to ground.

Board for clone of COT50 with master volume control.

Schematic: https://dl.dropboxusercontent.com/u/8021347/ChurchOfTone.png

A condensed version of the SAM4S Xplained board with onboard flash memory and a MicroSD slot, pinned out for SPI and I2C

MIC5205 from Micrel

Compact adjustable 1.5-5.5V switching regulator for N scale POV camera app.

Programmable PS/2-USB Converter

PIC18F4550

This board was designed to translate the non-standard IBM Model M 122-key Keyboard PS/2 scancode into the standard USB HID scancode.

120V / 12V 1.4A PSU 2014-02-21

For a project where off-the-shelf switching power supplies all had too much coil whine, I designed this linear power supply. It is noise-less, and runs silently. It is designed to be plugged into mains, with proper creepage/clearance zones, but you have to use a separate fuse in the power entry module for the grounded box you should mount this in.

Output voltage is set by the R2/R1 divider; the transformer and application I use set this at 12.0V.

If you’re not comfortable designing for and working with mains voltage electronics, I recommend against trying this project.

LiPo low-voltage cut-off 2014-03-24

After destroying a LiPo battery when forgetting to turn off a LiPo powered Raspberry Pi device, I built this circuit. It features a soft-power-on switch based on a P-channel MOSFET, and a space for an ATTiny85 to monitor voltage and turn off when it’s too low.

I have built this and use it, and I additionally talk to the ATTiny85 using the SPI in the Raspberry Pi (without chip select) to report voltage to the host, and do soft-power-off on demand.

Firmware for the ATTiny85 obviously is important for this project to work right!

20140420 P-channel Power Switch

This switch features pushbutton on and off action, as well as ability to actuate on and off through the 100-mil header. Power handling up to 20A, depending on specific P-channel MOSFET used and tolerance for board heat.

I have ordered, built, and tested this design, and it works well. Leakage current when off is below what I can measure – approximately equal to zero.

Revision A 2014-08-23

Surface Mount Breakout Board