App note: Building a stable DAC external reference circuit

Having a stable external reference is important in digital-to-analog converter design and this app note helps. For a DAC to function properly it must have a stable reference to create a precise output signal. Unfortunately because it is a simple concept, proper reference design is usually overlooked. In this app note from TI a simple force and […]

App note: Driving LEDs in battery-operated applications

Driving many LEDs from a battery can be a pain to do, especially if you need many of them to have the same brightness. One way to do this is to use current mirrors for each individual LED, and drive them from the battery voltage only. Another is to drive them with a dc-dc boost converter in […]

STM32L-Discovery board and ChibiOS/RT

Getting started with the STM32L-Discovery board and ChibiOS/RT: This article will explain how to get started with the recently released STM32L-Discovery board using ChibiOS/RT. This board is really cheap (around 12$) and is an excellent evaluation platform for the STMicroelectronics STM32L family. Thanks Giovanni! Via the contact form.

App note: Using Microchip’s capacitive sensing module

Capacitive sensing is used in tons of stuff like buttons, sliders, touch panels and proximity sensors. We like it because you only need to design the various buttons/sliders directly on the PCB and it works even under a face plate. It works by measuring the changing capacitance between a pad and a users finger as […]

Chronoduino board v0.3

The Chronoduino uses an Atmega168PA microprocessor. On the peripheral side there is a DS1337 RTC, a BMP085 barometric/temperature sensor, and a MCP73831 Li-Po battery charging IC. Numerous headers as well as two buttons, LED, and a buzzer are on the board. The idea behind the project is to design an Arduino watch platform (hence, quite unimaginatively – Chronoduino) that’s also […]

43oh Project of the month contest winners

We gave two PCB codes as prizes for a contest at 43oh. Here’s the winners: Congrats to andy1324 Okay so here is mine, it’s a small strotoscobic guitar tuner/development board for msp430 in 16 pin tssop package. and to xmob My entry, a camera intervalomter. For automatically taking photos at set intervals. This allows the […]

Free PCB coupon via Facebook to 2 random commenters

Every Friday we give away some extra PCBs via Facebook. This post was announced on Facebook, and on Monday we’ll send coupon codes to two random commenters. More PCBs via Twitter on Tuesday and the blog every Sunday. Don’t forget there’s free PCBs three times a every week: Free PCB Sunday. The classic. Every week, […]

Week in (p)review: October 07, 2011

Facebook free PCB Friday is on the way. Don’t forget to share your current project in the comments or the forum. Here’s a summary of major developments over the last week: There’s 3 weeks left to enter the Open 7400 Logic Competition 7400 competition entries: Money counter, Discrete logic POV clock, Discrete servo driver, and […]

Bus Pirate: JTAG XSVF player successfully programs Amani64 CPLD

Cliff bought an Amani64 CPLD shield for the Arduino, he had no way to program it except: I did have a Bus Pirate on hand, the ‘Swiss Army Knife’ of digital hobbyists. He successfully uploaded the LED blinking firmware onto the Amani64 with the Bus Pirate JTAG XSVF player. Now he is free to develop his CPLD skills. Get your […]

Free analog-to-digital converter demo board

rsdio writes: this was announced on April 1, and somehow I missed. I’m sure they’re all gone by now, but the links still seem to work The MAXADCLite evaluation (EV) kit is based on the MAX11645 ADC, which integrates a multiplexor, FIFO, sequencer, and reference, all for the same price as a competitive stand-alone ADC. […]

Interview with Dangerous Prototypes at Open Source Hardware Junkies

Last week Ian did a Skype interview with Open Source Hardware Junkies. It’s up today, listen in if that’s your kind of thing: Need to figure out a chip…fast? Bus Pirate may be just what you have been looking for. Designed by Dangerous Prototypes, the Bus Pirate is a universal bus interface that can slash […]

Chip powers LED lamps in MR16 halogen bulb systems

This driver is used in LED replacement lamps for MR16 halogen bulb sockets. It’s compatible with common dimmers: The MAX16840, an LED driver that employs a proprietary architecture to ensure flicker-free, dimmable operation with electronic transformers and cut-angle dimmers. Maxim’s patent-pending approach enables the design of retrofit LED lamps that can replace halogen MR16s without […]