Recent posts

#FreePCB via Twitter to 2 random RTs

Every Tuesday we give away two coupons for the free PCB drawer via Twitter. This post was announced on Twitter, and in 24 hours we’ll send coupon codes to two random retweeters. Don’t forget there’s free PCBs three times a every...
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mbed LPC1768 board with the XC2C64A CPLD board

@torusle tweeted, “My mbed LPC1768 board is about to do some serious jtag business with the CPLD CoolRunner2 board from @dangerousproto”   Get the CoolRunner-II development board for $15 and XC9572XL dev-board  for $15.

Low cost DC millivolt source

Dilshan Jayakody has published a new build, a DC millivolt source: DC millivolt sources are often used for thermocouple simulations, DMM, ADC and analog circuit calibrations and fault findings, etc. Most of the DC millivolt circuits are based on...
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Soldering Iron PID temperature controller

Mike has posted a detailed tutorial on how to modify an ordinary plugin soldering iron to work with a digital temperature controller: A thermocouple was mounted internally inside the soldering iron so it is out of the way. The idea was to find...
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10×5 RGB LED Matrix with only 5 IO pins

Here’s an instructable on LED Matrix with custom code/software by Ole_L: This is the software which you need: -Arduino -Processing Flash the software to your Arduino and open the processing project with… Processing! Now you should...
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Free PCB Sunday: Pick your PCB

We go through a lot of prototype PCBs, and end up with lots of extras that we’ll never use. Every Sunday we give away a few PCBs from one of our past or future projects, or a related prototype. Our PCBs are made through Seeed Studio’s Fusion...
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App note: DC leakage failure mode in solid tantalum capacitor

An application note from Vishay on the causes of increased DC leakage current on solid chip tantalum capacitors. PDF link Here. This paper is submitted as an educational medium for use by anyone who has interest in solid tantalum chip capacitor...
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App note: Charge and discharge application of electrolytic capacitor

An application note from Rubycon about what causes electrolytic capacitors to deteriorate. PDF link is Here. Performance deterioration of aluminum electrolytic capacitor is accelerated by repeated charge and discharge. The speed of deterioration...
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App note: L6234 three phase motor driver

An app note (PDF!) from STMicroelectronics on L6234 three phase motor driver: The L6234 is a DMOSs triple half-bridge driver with input supply voltage up 52V and output current of 5A. It can be used in a very wide range of applications. It has...
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ESP8266 Wifi information LCD

Renze shares his ESP8266 Wifi information LCD in the project log forum: This is a little project I did in about 2 hours. It uses an LCD display I got from an old ISDN phone and shows text sent to it over WiFi. The ESP8266 runs a webserver which...
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