Another app note from Aimtec on power supplies and how to minimize their output noises. Link here The switching power supplies have the fundamental advantage of high efficiency i.e. low power dissipation when compared to linear voltage regulation. However, there exists an important consideration concerning the presence of ripple and noise at their outputs. If […]
Author Archives: DP
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: The optimum method to test the output ripple & noise of power supplies
Application note from Aimtec about testing power supplies, Link here The switching power supplies have the fundamental advantage of high efficiency i.e. low power dissipation when compared to linear voltage regulation.
App note: SAM D/R/L/C Watchdog (WDT) driver
Atmel application note (PDF!) for using the Watchdog in a callback configuration: This driver for Atmel | SMART ARM-based microcontrollers provides an interface for the configuration and management of the device’s Watchdog Timer module, including the enabling, disabling, and kicking within the device. The following driver API modes are covered by this manual: Polled APIs […]
LDMOS amplifiers
Pete (N6QW) writes: This project encompasses proving an Arduino Control of a hi Power Linear Amplifier. It is a new departure for N6QW as it has extensive I/O requirements which required moving to the Mega 2560 a Arduino variant that has 56 Digital I/O and 16 Analog Inputs. The on board memory is 256K The […]
Adding a DHT22 temperature and humidity sensor to the Sonoff
Mikey writes: Just a few days ago I replaced the firmware on my Sonoff, and immediately after, I wanted more… After looking on their website, I found a version which also had a DHT11 sensor attached, and I then wanted to do something similar, just with a DHT22 for higher resolution (0.1C on a DHT22, […]
WiFiRGB – A WiFi-enabled RGB high-power LED
Tom blogged about his WiFi/Browser controlled RGB LED project: Features Simple hardware, using pre-fabricated modules Controls an RGB LED via any recent browser, any operating system WiFi credentials can be configured via browser Software is written as an Arduino sketch Full details at Tom’s blog. Check out the video after the break.
#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 […]
Arduvision II: OV7670 + FIFO module and arduino Mega
David has posted a tutorial on how to use an Arduino Mega to interface the ov7670 sensor. More details at TheRandomLab. Check out the video after the break.
ESP8266 control panel upgrade
Evan writes, “While writing the article on multiplexing the esp’s inputs I came up with the idea of PWMing all the outputs at once by interrupting the path to ground with an n-FET. That’s actually not a bad idea, and I have an extra input on the analog MUX that I can use for a […]
WA2EBY IRF510 amplifier
Flathagen has published a new build: The WA2EBY amplifier is a famous linear amplifier project published in QST in March and April 1999 by Mike Kossor WA2EBY. As this amplifier can give up to 50W out with 1W drive, it is a perfect pair for my Softrock RXTX amplifier. The articles can be found on […]
Designing a mains frequency monitor
Dan Watson writes: This is the second in a series of posts about designing a mains frequency monitor using the Microchip PIC 16F1619 microcontroller. In this post we will take a look at the first revision of the board that I designed for the project and some of the features that it adds. Be sure […]
App note: Best design and layout practices for SiTime oscillators
SiTime’s app note about how to properly route an oscillator’s PCB traces. Link here Proper decoupling, bypassing, and power supply noise reduction is important in many applications to ensure optimal performance for oscillators. A common strategy is to place capacitors near high speed devices on a printed circuit board (PCB). These capacitors serve important functions: […]
Free PCB Sunday: Pick your
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: Frequency measurement guidelines for oscillators
Application note from SiTime about frequency measurements and how some methods may not gauged accurately. Link here Every digital electronic device requires a reference clock and oscillators are widely used to serve that purpose. Verifying frequency characteristics of high performance devices requires accurate frequency measurement. This document contains an overview of various frequency measurement methods […]
App note: Selecting inductors for buck converters
An application note (PDF!) from Texas Instruments on inductor selection: This application report provides design information to help select an off-the-shelf inductor for any continuous-mode buck converter application. The first part shows how the designer should estimate his requirements, specifically the required inductance. The next part takes an off-the-shelf inductor and shows how to interpret the […]
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. The coupon code usually go to Facebook ‘Other’ Messages Folder . More PCBs via Twitter on Tuesday and the blog every Sunday. Don’t forget there’s free PCBs three […]
How to build a control circuit with adjustable working time via wi-fi
Yahya Tawil over at All About Circuits posted a detailed how-to on building a control circuit with adjustable working time via Wi-Fi: In this article, you’ll learn how to build a system that can turn DC loads on and off using a mobile application. You’ll also learn how to perform this task via immediate actions or via […]
DIY Powerpole voltage and current meters
Sverre Holm made his own powerpole voltage and current meters: Powerpole voltage and current monitoring is quite nice to have. One can buy commercial meters, but due to the availability of nice and cheap modules, it is very easy to make them oneself. To the right you’ll see my combined voltage and current meter as well as […]
Project curve tracer
Jason Jones has been working on a curve tracer project: As the hardware is at the point of initial release, but the firmware and GUI aren’t quite there yet, I decided that it would be prudent to split off the firmware and GUI components into their own GIT repositories. Tracking all files in the […]