Tag Archives: DIY

Easing the pain of SWD on modern DPS:es

via Dangerous Prototypes


Johan Kanflo writes:

On newer DPS:es, the SWD connector is a JST-GH (1.25mm spacing that is) which translates to “really tiny”. The annular rings where you need to apply solder and heat for adding wires are even smaller. This is why the OpenDPS SWD Bottle is handy. Add three P50-E2 pogo pins, and connect to your favourite SWD debugger.

See the full post on his blog.

Arduino controlled Dual Mono AK4490 DAC (part 2)

via Dangerous Prototypes


An update on Arduino controlled Dual Mono AK4490 DAC project we covered previously:

After I was certain that everything related to the software was working the way it should, I designed a “motherboard” that would take care of the following:

  • Accept the STM32F106 board
  • Accept the 3.5″ TFT
  • Accommodate an 24LC256 EEPROM chip, used to store the DAC’s configurable settings
  • Accommodate two sets of I2C signal isolators and I/O expanders
  • Include headers for the encoder, IR receiver, power relay, non-isolated and isolated I2C communication, unused uC pins, etc

See the full post here, Dimdim’s blog.

Bus timer project

via Dangerous Prototypes


Limpkin published a new build:

For once, this project was not for me… it was for my wife !
Every morning she takes the bus then train to go to work. If she misses her train, she has to wait for more than 30 minutes for the next one. Not missing her bus is therefore quite important.
Where we live every bus station has a display letting you know in real time when the next bus will be there. My first thought was to reverse engineer its RF signal but something easier then came to mind.
In the very same bus stations, a small QR code brings you to a web page displaying the very same “minutes before bus arrival”… HTML parsing therefore made more sense given that I was fairly busy with other projects.

See the full post on his blog.

Overdrive guitar effects pedal

via Dangerous Prototypes


Eddie over at Bantam Tools shared detailed instructions of how to build this DIY overdrive effects pedal:

This project shows you how to make your very own effects stompbox! We’ll go through the steps of downloading the .brd file, loading the file into our software, milling the board on the Bantam Tools Desktop PCB Milling Machine, and soldering the components. This is a great tutorial for those new to milling printed circuit boards (PCBs) or for those who want practice soldering components to the board as a part of a larger assembly.

More info at Bantam Tools project page.

Simpleceiver Plus version 2 SSB transceiver

via Dangerous Prototypes


An update on Pete Juliano’s (N6QW) Simpleceiver project we covered previously:

Version 2 — What is it? V2.0 is the Simpleceiver Plus SSB Transceiver Architecture with the following changes:

  • A GRQP Club 9.0 MHz Crystal Filter is used in place of the homebrew 12.096 Four Pole Filter. This gives the advantage of acquiring the matching crystals for the BFO and with a 5 MHz Analog VFO you can have a two band rig (20 meters or 80 Meters). The only change required is the appropriate matching Band Pass and Low Pass Filters. A couple of relays and a toggle switch will put you on either band. So a big plus here. Or you can leave it on 40 Meters.
  • Compacting the rig in physical size. I have used two 4 X 6 inch PC Board and fit all of the circuitry on these two boards which will then be stacked upon each other.

See the full post on his blog.