A sound activated switch project by Rajkumar Sharma of Electronics Lab: Clap switch/Sound-activated switch designed around op-amp, flip-flop and popular 555 IC. Switch avoids false triggering by using 2-clap sound. Clapping sound is received by a microphone, the microphone changes the sound wave to electrical wave which is further amplified by op-amp. 555 timer IC […]
Author Archives: DP
Dirty boards from DirtyPCBs
@0xPIT tweeted, “PCB production and free delivery took just exactly 4 weeks to DE. Good quality. Thanks @DirtyBoardsPCBs
New microchip promises to streamline and simplify diabetes diagnoses
Dr. Brian Feldman and his team at Stanford University have developed a new microchip. It promises to streamline and simplify diabetes diagnoses. Ben Coxworth of Gizmag writes: For people who don’t already know, here’s the difference between type 1 and type 2 diabetes: the body produces little or no insulin in the case of type 1, and […]
Light Appliance – Remote controlled 32×32 RGB LED Matrix
IR remote controlled light appliance application for the 32×32 RGB LED Matrix by Craig Lindley, that is available at Github: My latest creation, the Light Appliance. This device displays various graphical routines (plasmas, fractals, etc.), animated GIFs, displays time, date and temperature, can be an open or closed sign for a business and a mood […]
Lasercut strip feeder for your pick & place
Do you need a strip feeder for your pick & place? Felix of LowPowerLab shows you how to easily make a DIY strip feeder: So let’s make a strip feeder. I have lots of components that are less than a full reel (exotic resistors, transistors, crystals, caps, mosfets etc). Most of these are 8mm and […]
Microphone PCB from Dirty PCBs
ntractiv’s another project from Dirty PCBs, the Microphone PCB:
Digital Zoetrope
Sholto wrote this instructable detailing the build of his digital zoetrope: A zoetrope is a mechanical device that animates a series of pictures by spinning them fast enough that the images appear to merge together and move, My digital zoetrope works on a similar principal, by flashing the LEDs while they are spinning it is possible […]
How to recover a laptop after a failed BIOS update
Viktor describes on his website how he used the Bus Pirate to recover a laptop after a failed BIOS update: Once I had to open the laptop to fix it I decided to take this opportunity to explore the options there are for fixing the broken BIOS and compile my findings in this article. In the process […]
Yet another laser cut Open Bench Logic Sniffer case
Yet another laser cut Open Bench Logic Sniffer case by builttospec: This one is a bit thinner thanks to the use of brass inserts and 0.06″ acryic for the board layer. The PCB is nice and secure and the buttons are easily accessable without the use of a paper clip or big holes in […]
Mini FM transmitter
electronics-diy shows you how to easily make a mini FM transmitter: It transmits FM waves so you could easily receive the signals on your mobile phone, radios, etc. As the name and the picture indicates it is very small and is approximately the size of a 9v battery clip. With this FM transmitter you could […]
How to hack a manual control into a cheap DMX dimmer
This article shows how to hack a manual control into a cheap DMX dimmer by Miceuz and Rxdtxd of wemakethings; One of our friends wanted to have a manual-control LED dimmer for his stop motion setup. We had several of these cheap Chinese DMX dimmers. How does one adds potentiometer control to something like this? Just cut […]
#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 week: Hate Twitter and Facebook? Free PCB Sunday is the classic PCB giveaway. Catch […]
Eurorack power supply from Dirty PCBs
ntractiv posted pictures of his Eurorack power supply from Dirty PCBs. Via Flickr.
Sniffing I2C traffic with a Bus Pirate
Joshua shows us how he sniff the I2C traffic with the Bus Pirate: As far as wiring and software setup, it’s the exact same from the previous post with the exception of adding on the Bus Pirate connections to the SDA and SCLK pins, along with a ground. Also, I swapped out the Bus Pirate from […]
DS3232 clock frequency calibration
Kerry Wong writes: DS3232 is an extremely accurate RTC with a guaranteed accuracy of 2.5 ppm (0 °C to 40 °C), which translates into an error of just 80 seconds over the course of a year under the worst case scenario. I had done a few projects using this chip before (you can read about […]
PIC-18 Breakout with ICSP
A breakout for 18 pins DIP package Microchip PICs by Electropepper, he writes: I needed to make a small test on some old chips i had, so i came up with a quick hour and half, break-out board for most PICs DIP-18 sockets. I also included an ICSP header. I have been using this mostly to […]
Bus Pirate v3.8 free PCB build
@psmay tweeted picture of his free Bus Pirate v3.8 PCB build: If you build a free PCB we’ll send you another one! Blog about it, post a picture on Flicker, whatever – we’ll send you a coupon code for the free PCB drawer. Get your own handy Bus Pirate for $30, including world-wide shipping. Also […]
Flux capacitor – Back to the future
n1cod3mus made this flux capacitor from Back To The Future. He writes a complete step-by-step guide on the Instructables site: Since the release of the film back in the 80s I have been obsessed by the film Back To The Future watching the trilogy repeatedly. I watched it at the cinema over and over, I […]
LM386 low voltage audio power amplifier
Zx Lee published a low voltage audio amplifier build: Today, I am going to share on how you can make a low voltage audio amplifier. For this project, I am using LM 386 Audio Amplifier, which is commonly used among electronics hobbyist. I will break the article into a few sections. First, I will explain about the […]
App note: Hiccup-mode current limiting
This is fairly old but interesting over current protection using Hiccup-mode from Microsemi. PDF here. Hiccup-mode is a method of operation in a power supply whose purpose is to protect the power supply from being damaged during an over-current fault condition. It also enables the power supply to restart when the fault is removed. There […]