Anfractuosity published a new build: “Acoustic cryptanalysis is a type of side channel attack that exploits sounds emitted by computers or other devices” Wavecatcher is a simple PCB that makes use of a MEMS ultrasound microphone, in order to capture audio to around 80kHz, with the goal of finding interesting ultrasound sources and playing with […]

DC/DC switcher for 5v TO 3v at 750mA in a TO-220 7805 footprint

An open source small DC/DC 3W switcher to drop 5V to 3V in a 7805 TO-220 pinout from Black Mesa Labs: This post is an open source hardware design from Black Mesa Labs for a simple DC/DC converter for dropping 5V to 3.3V ( or adjustable to lower voltages via resistor selections ). The design […]

App note: Adding flexibility by using multiple footprints for I2C™ serial EEPROMs

Save PCB space by utilizing EEPROM SOIC-8 area, here’s an application note from Microchip. Link here (PDF) For many years, the 8-lead SOIC package has been the most popular package for serial EEPROMs, but now smaller packages are becoming more commonplace. This offers a number of benefits; the reductions in footprint size and component height […]

App note: PCB routing methodology for SuperSpeed USB 3.1 switch family from ON Semiconductor

Routing USB 3.1 traces app note from ON Semiconductor. Link here (PDF) The introduction of USB Type−C has provided a significant launch opportunity for USB3.1 data rates across an array of platforms from portable to desktop and beyond. This proliferation of Type−C will certainly create challenges due to the high speed nature of the interface. […]

Pimp your PCB businesscard full color

Here is a nice PCB businesscard @ smdprutser.nl As a good electronic hobbiest tradition I started to design a businesscard from PCB material. Downside of all the businesscards (and PCBs in general) is the limited number of colors you can use: FR4, soldermask (with or without copper behind it), silkscreen or bare copper. Since the […]

Magic Mote MSP430G2553 wireless sensor node with NRF24L01+ module

Tom from Magic Smoke writes: This is my first time designing a PCB for MSP430. I really like the NRF24L01+ booster pack but I would like something smaller to use for remote temperature sensors. With that in mind I’ve designed a 24.5 x 50 mm PCB (2 on a 5×5 cm prototype) featuring MSP430G2553 and […]

Things to avoid when sending PCBs to the fab house

Sjaak shared some tips when sending PCBs to the fab house: I usually collect a few PCB designs before sending them off to the PCB fabhouse. I prefer to use dirtypcbs.com as I know Ian from dangerousprototypes.com for a long time and think he provides good quality, and fast turn around time for your money. […]

Crystal Ladder filter

Dan Watson writes: Here’s a little board for making a four pole crystal ladder filter. This type of filter has a very high Q and narrow bandwidth, allowing you to select a specific frequency from your signal. Because of the narrow bandwidth, selection of the capacitors and tuning of the filter is important to achieve […]

App note: Thermal behavior of small-signal discretes on multilayer PCBs

App note from NXP Semiconductors about multilayer PCB as additional heatsink for flat SMD components mostly power transistors to dissipate heat. Link here (PDF) This application note illustrates how to improve the power dissipation of discrete components by using multilayer PCBs. It focuses on the impact of using larger copper areas to improve the thermal […]

App note: Design considerations for mixed-signal, How to design a PCB layout

Another application note from e2v, this time about PCB design involving mixed-signal (Analog and Digital) components. Link here (PDF) This application note aims at providing you with some recommendations to achieve improved performance. The initial assumptions are the following: • Proper grounding and routing of all signals is essential to ensure accurate signal conversion • […]