An app note from International Rectifier on using P-Channel MOSFETs P-Channel HEXFET Power MOSFETs offer the designer a new option that can simplify circuitry while optimizing performance and parts count. In principle, nothing can be done with a P-Channel MOSFET that cannot be done with an N-Channel plus some extra gate drive circuitry. The main […]
Author Archives: DP
Infrared Receivers – signal lag and distortion
The crew from AnalysIR writes: Many electronics enthusiasts will be familiar with how Infrared receivers demodulate IR signals. In this post we show a visualisation of the time lag and distortion of the signals as they pass through the IR receiver for demodulation and noise filtering. Most DIY projects use the raw timings from the […]
Free PCB coupon via Facebook to 2 random commenters
eEvery Friday we giveaway 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 free […]
Week in (p)review March 28, 2014
Here’s a summary of major developments over the last week. Free PCB Friday is coming up soon. Hacker Camp Shenzhen map and schedule arrives Hacker Camp Shenzhen patches Meet the amazing China power outlet USB RGB color changer, Superprobe, and xQFP80 +65 Protoboard free PCB build Bus Pirate Demo Board 1: 1 Wire devices Check out TomKeddie’s USB […]
SMD March – Tweaks to Ishan Kehribar’s ethernet gateway
TomKeddie writes: For our SMD March workshops I chose Ishan Keribar’s Embedded Ethernet Gateway. I added an FT230X and usb port with a Arduino uno style reset on CTS (230X has no DTR but avrdude toggles both). I also used a SOB 5050 template to make cases easy to design. By adding an 8MHz variant […]
@tymkrs MorePi Me v1 Pi shift register board
Charles Douvier blogged about his MorePi Me he won in a contest: I unpacked the board and soldered it all together. Not a lot to say about it because it’s just a board, four DIP sockets/74HC595′s a couple connectors and 3 resistors. I like that they included sockets; I would have added them myself but […]
USB RGB color changer free PCB build
Randy Ledyard built a free USB RGB Color Changer PCB. 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.
Dr Brown’s capacitor ESR tester
Rupert Hirst writes: I finally got round to making my capacitor ESR tester this week after finding a nice simple 5 transistor version by EEVBlog member Jay_Diddy_B. Unfortunately, for me, the design was only SMD so, I decided to replicate his schematic in Eagle PCB using a through hole component design.
Hacker Camp Shenzhen map and schedule arrives
By ian There’s a lot of Huaqiangbei maps out there (Seeed Studio, HAXLR8R, Oomlout), but we needed one specifically for Hacker Camp Shenzhen. This map has favorite component and tools buildings, some hidden and not normally visited. It also has ‘local’ places I’ve discovered during the last year living in the market area: cheap and […]
RGB lamp made from an old scanner
Here’s an RGB LED Lamp made from old scanner parts and controlled via a web panel with a colour picker by Hack Shed: We have come up with LANp – This is an Arduino and Ethernet Shield that controls an RGB LED colour real-time with a Javascript colour picker. What’s in it? 1x Arduino 1x Arduino […]
Home produced 700VA isolation transformer
Dilshan Jayakody writes: This a quick post regarding homemade 300V – 2.3A isolation transformer. This transformer is a part of my ongoing 300V AC/DC variable power supply project and it’s boxed as a separate unit because of its heavy weight and size. All the parameters of this transformer are calculated using small Python script which […]
MSP430 and a HC-SR04 ultrasonic ranging module
Juan Ignacio writes: A while back I bought an HC-SR04. It sat in a box until yesterday when I tried to use it with an MSP430G2553 but unfortunately it wasn’t working. I used Energia to program the Launchpad but I wasn’t getting any response from the device. I hooked up my Logic analyzer to see what […]
#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 […]
xQFP80 +65 Protoboard free PCB build
Harshad Italiya sent us a picture of his free xQFP80 +65 Protoboard PCB build: Thank you Dangerous Prototypes your free PCB comes to rescue me and I did my first prototype on this PCB. 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 […]
Tektronix MDO4104B-6 mixed domain oscilloscope (MDO4000B) review and experiments
Tektronix MDO4104B-6 mixed domain oscilloscope (MDO4000B) review and experiments by Shahriar: In this episode Shahriar reviews and demos the second revision of the industry’s first Mixed Domain Oscilloscope from Tektronix. The MDO4000B series offers improved signal integrity and performance. The reviewed model is a MDO4104B-6 which offers 16-Channel Logic Analyzer, 4-Channel Oscilloscope with 1GHz of analog […]
Superprobe free PCB build
Paco sent us a picture of his free Superprobe 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. Via the contact form.
Hacker Camp Shenzhen patches
By ian It’s amazingly easy and cheap to get things made in China. To showcase that we’ve had hackerspace passport stamps, banners, and now patches made for the workshop. These patches, while not the best quality ever, were only 1RMB each ($0.16USD) for 50 pieces – delivered in 5 days. Everyone attending the workshop will […]
Simple USB Isolator
TomKeddie shared his USB Isolator in the project log forum: This is a nice simple soldering project that does exactly that, isolates your USB port from connected devices. There are two input usb connectors, one carries data and power from the computer the other supplies power to the output. The output comes from a 3rd […]
Personal audio & MIDI prototyping board
@rocket_not tweeted: Personal audio & MIDI prototyping board based on a design originally by @dangerousproto
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 […]