Jechavarria writes, “Here you can find the last board I develop on DirtyPCB. I’m very happy with the results!” Via the project log forum.
Author Archives: DP
+/-12V dual power supply
A power supply build by Rajkumar of Electronics Lab: This project is a solution to power up most of devices or projects requiring dual (+/-12V) power supply. Symmetric +/-12 VDC power supply has been designed for audio applications, can power up microphone pre-amplifier, audio buffers, audio mixer, distributions amplifier, headphone amplifier, VU meter and few o other […]
SG90 servo controller
Zoltán of PakaHuszar is working on a SG90 servo controller: The original idea was the following: TI Launchpad + SG90 servo, connected to a PC via USB port and it can be controlled from there.
#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 […]
Curious C-beeper
Electronics DIY published a new build, the Curious C-beeper: Curious C-Beeper is a fun to build little probe that can be used to quickly detect the capacity of capacitors in pF nF range, test their stability with temperature changes, find broken wires, locate wires, trace wires on PCBs, and to locate live wires behind the walls […]
Geek Tour: Visit Shenzhen
Shenzhen is the hot geek destination right now. Since the hacker camp last spring, it seems like there are at least 3 hackers roaming the neighborhood at any given moment. Add the constant HAXLR8R classes and you’ve got a great vibe. We put together a wiki page to help plan your trip to Shenzhen. Where […]
Temperature data logger using PIC12F683 and DS1820
Rajendra over at Electronics Lab wrote an article on his temperature logger based on a Microchip’s 8-pin microcontroller, PIC12F683: A data logger is a device that records measurements over time. The measurements could be any physical variable like temperature, pressure, voltage, humidity, etc. This project describes how to build a mini logger that records surrounding temperature […]
Wavetek 907 signal generator teardown
Kerry Wong did a teardown of a Wavetek 907 signal generator: This Wavetek 907 is absolutely humongous. It has the same width as my HP 5350B but is much deeper (23 in.) and weights around 50 pounds. It was built in 1980 and is clearly showing its age. It was sold as “used” so presumably it […]
uVolume T-32 USB volume & media control update
Another update on µVolume USB volume control project by Rupert Hirst of RunAwayBrainz, we covered it previously: µVolume T-32 USB Volume Control update, featuring infra red media control Features: -Arduino Compatible (Atmel Atmega32u4) -Manual volume adjustment using the rotary encoder -(IR) Infra red remote control of volume and multimedia controls -Apple remote or user defined […]
MakeyMakey from Dirty PCBs
TomKeddie writes: MaKeyMaKey was a very successful Kickstarter from some smart guys at MIT. It uses capacitive touch to stimulate USB HID devices using a Arduino Leonardo compatible programming environment. We ran a workshop at VHS in Vancouver Canada in July 2014 building these using PCBs from Dirty PCBs. The design is open hardware, the […]
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 board service. This week two random commenters will […]
App note: Design of a low cost, 45W flasher with short circuit protection using LM2902 (Quad Op-Amp) and CSD18534
App note (PDF) on automobile flashers from Texas Instruments This Application note presents the design of a low cost, flasher circuit with short circuit protection. The design incorporates the entire recommended design feature set for two wheeler flashers and includes low/high voltage operation, half load frequency doubling, and short circuit protection.
App note: Use of MLCC capacitors
App note(PDF) on using Multi-layer ceramic chip(MLCC) capacitors from Altera. Multi-layer ceramic chip (MLCC) capacitors are used quite often in dc-dc converter input and output filters instead of tantalum or aluminum electrolytics. MLCC’s have low ESR, low ESL, and low cost. They also have no major reliability problems associated with them. All these properties make […]
App note: Using the AVR’s High-speed PWM
Atmel’s app note on using the AVR’s High-speed PWM (PDF!): This application note is an introduction to the use of the high-speed Pulse Width Modulator (PWM) available in some AVR microcontrollers. The assembly code example provided shows how to use the fast PWM in the ATtiny26. The ATtiny15 also features a high-speed PWM timer. The fast PWM […]
App note: High voltage, low noise, DC/DC converters
An app note from Linear Technology: High voltage, low noise, DC/DC converters (PDF!) Photomultipliers (PMT), avalanche photodiodes (APD), ultrasonic transducers, capacitance microphones, radiation detectors and similar devices require high voltage, low current bias. Additionally, the high voltage must be pristinely free of noise; well under a millivolt is a common requirement with a few hundred microvolts sometimes necessary. […]
SWD programmer for PSoc4 based devices
ghent360 writes: For those of you who want to program a PSOC4 based device I have a firmware for FX2LP device + PC software to perform the operation. It has the same hardware interface as the device here: PD0-SWDIO;PD2-SWDCL;PB2-XRES. You can also use any “cheap as chips” board from ebay or amazon. Here are the […]
Logic Pirate back in stock
Logic Pirate is back in stock at Seeed Studio. It is an inexpensive, yet capable open source logic analyzer. It can sample 8 channels at 20 million samples per second, and may be overclocked for even faster acquisitions. It’s designed to support the open source SUMP logic analyzer protocol with software available for most operating systems. […]
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 every week: Free PCB Sunday. The classic. Every week, get […]
Week in (p)review July 25, 2014
Here’s a summary of major developments over the last week. Free PCB Friday is coming up soon. Recover a laptop after a failed BIOS update with the Bus Pirate Sniffing I2C traffic with a Bus Pirate Bus Pirate v3.8 free PCB build Yet another laser cut Open Bench Logic Sniffer case Bus Blaster v4 and […]
An open letter to NXP Semiconductors about LPC1114FN28
ytsuboi wrote an open letter to CEO of NXP, and get replied: I sent this e-mail to the CEO of NXP Semiconductors. (23 July 2014, 4:36am JST) To: NXP Semiconductors N.V Richard L. Clemmer, Executive Director, President and CEO Dear Mr. Clemmer, About a week ago, I found an unbelievable information about LPC1114FN28 on Digikey and Mouser. […]