7400 Logic Based Calculator is the open 7400 competition entry by students of the Pakistani Institute of Industrial Electronics Engineering. This was an assignment during their 6th semester course Digital Electronics II. Digital logic based calculator built on 7400 series ICs which can add and subtract two digits with clear, and backspace as well This project […]
Author Archives: DP
Make your own Nixie tube socket tutorial
Electronics Lab brings us a tutorial on how to build sockets for IN-14 Nixies. The idea is simple. Use the spacer that comes with the Nixie, and insert female pinheaders into it. All that’s left is to shorten the leads coming from the Nixie, and you got a Nixie socket.
Eagle Parts: Folding micro SD card socket and the PIC24F16KA102 microcontroller in SOIC-W and SSOP packages
The latest parts to be added to our Eagle part’s library are the folding micro SD card socket, and the PIC24F16KA102 microcontroller. The symbol for the PIC is connected to the SOIC-28W, and SSOP-28 footprints. Check out a picture of it below.
#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 […]
GLOBAL GEEK TOUR: rhydoLABZ in Kochi, India
Visiting rhydoLABZ in Kochi for our final geek tour stop in India. Many say rhydoLABZ is the Sparkfun of India. rhydoLABZ tour group. Thushar and wife, Aaron from oomlaut, and own More pics below the fold.
Want us to extend the open 7400 competition deadline by a week?
We’ve been getting requests from you to extend the deadline of the open 7400 competition. We’re considering pushing the entry deadline by a week. If this is helpful to you, post about it in the comments. The official deadline is tomorrow, October 31st. Build something that uses or abuses a logic chip and get amazing […]
ATX Breakout Board v1.1 Sick of Beige case is available at Seeed
ATX Breakout Board v1.1 Sick of Beige case is available for $4 at Seeed Studio. This case is designed to be simple, cheap, and easy to assemble. The ATX Breakout Board is sandwiched between two laser-cut acrylic sheets, and the whole assembly is held together with aluminum screws and standoffs. Check out our tutorial on […]
7400 Competition Reminder: Only 2 days left to enter your design
Just a reminder to all potential entries that the deadline is October 31st. You now have only 2 days to submit your entry. Good luck! Build something that uses or abuses a logic chip and get amazing boards, tools, and other swag. The Open 7400 Logic Competition promotes awareness of the basic building blocks of […]
Workshop Update for October 29th, 2012
Emirates upgraded us to business class on the second floor of the A380, it was sweet! Lay flat bed, and a well stocked bar in the back of the plane. Although the baggage reclaim was a pain as the A380 just carries too many people. We modeled and rendered the FT230X Breakout Board. This proved […]
7400 competition entry: 7400 ping))) pong
Alex entered his 7400 ping))) pong video game into the 7400 Logic Competition. It’s a clone of the old TV console classic, but implemented with 7400 logic and 556 timers (twin 555s). The project took a total of thirty 7400 chips and 556 timers. There is no microcontroller, just discrete logic. It keeps score by the […]
Bus Pirate Demo board v5 free build
Systemstech assembled a Bus Pirate Demo Board v5 free PCB. This board was designed to emulate various different ICs with which the Bus Pirate can talk to. I2c, SPI, and UART protocols are supported, with device emulation for RAM, ADC, DAC, and a PWM generator. If you build a free PCB we’ll send you another […]
GLOBAL GEEK TOUR: At Cerebra Tech PCB assembly in Bangalore, India
At Cerebra Tech PCB assembly in Bangalore, India. Follow the pics live with our twitter feed, or wait for them to pop up on the blog. More pics below the fold.
Hak8or’s scavenge of electronic parts from old computer hardware
Got an old computer collecting dust? Break out the hot air, and start scavenging for electronics gold. This is just what Hak8or did over the weekend. He took components form an old motherboard, and a SCSI PCI card. For a detailed component by component breakdown of his score check out his blog. I wanted to […]
App note: Nine often overlooked specifications in analog to digital converters
Here’s an app note form Analog Design describing the nine often overlooked parameters of analog to digital converters, and how they impact the design. The article goes over the resolution, power supply rejection (PSR), common-Mode rejection (CMR), the clock slew rate, aperture jitter, aperture delay, conversion time and conversion latency, wake up time, output loading, […]
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: Using UART to implement a 1-Wire bus master
Here’s an app note from Maxim describing how to implement a 1-Wire bus master using the UART peripheral of your preferred microcontroller. This application note explains how to use a microprocessor’s UART to implement a 1-Wire® bus master. It includes an explanation of the required electrical interface, UART configuration, and timing relationship between UART and […]
App note: Implement capacitive sensing on a PIC10F microcontroller
Here’s an app note from Microchip describing how to implement capacitive sensing using two pins on the tiny PIC10F microcontroller. Capacitive sensing is implemented by turning the comparator into a relaxation oscillator. The output of the comparator is used to charge and discharge the sensing capacitor, that is formed by a pad on the circuit […]
App note: Interview with Bob Dobkin the chief technical officer at Linear Technology
Here’s an interview with Bob Dobkin, the CTO and co-founder of Linear Technology. He talks about how he started in the industry, the founding of Linear Technology, reasons behind application notes, and how to become a good analog engineer. He also talks about Jim Williams, the late analog design guru who’s responsible for many excellent […]
7400 Competition Reminder: 5 days remains until the entry deadline
Just a reminder to all potential entries that the deadline is October 31st. You now have only 5 days to submit your entry. Good luck! Build something that uses or abuses a logic chip and get amazing boards, tools, and other swag. The Open 7400 Logic Competition promotes awareness of the basic building blocks of […]
Workshop Update for October 26th, 2012
Today will be marked as the stone age day of Dangerous Prototypes. While visiting Kochi, and the rhydoLABZ factory on our Global Geek Tour of India, we had no data coverage so we were incommunicado. Similarly in the workshop internet went down, and we were unable to bring you the regular compliment of posts. We’re […]