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 […]
Author Archives: DP
App note: Noise analysis for high-speed op amps
An application report on op-amp noise analysis from Texas Instruments. Link here (PDF) As system bandwidths have increased, an accurate estimate of the noise contribution for each element in the signal channel has become increasingly important. Many designers are not, however, particularly comfortable with the calculations required to predict the total noise for an op […]
App note: Infrared remote control implementation with MSP430FR4xx
Infrared remote control implementation with MSP430FR4xx application note from TI: This application report provides an insight into several of the most frequently used infrared protocols and especially their flexible implementation using the TI MSP430FR4xx series of low-power microcontrollers. The MSP430FR4xx microcontrollers are primarily targeted at remote control application that are equipped with infrared modulation function […]
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 […]
Bertan/Spellman 225-20R HV power supply teardown
Kerry Wong did a teardown of a Bertan 225-20R 20kV high voltage power supply: I just picked up another high voltage power supply, this time it is a working Bertan/Spellman 225-20R 20kV one. Unlike the Bertan 205A-05R that I did a teardown with last time which was entirely analog, this one can be controlled digitally […]
Adjusting clock with alarm, hygrometer & thermometer on 1.8″ ST7735 display
Nicu Florica blogged about his adjusting clock with alarm, hygrometer and thermometer on 1.8″ ST7735 display: I use feature from article Another adjusting clock with alarm & thermometer using DS3231 on 1.8″ ST7735 display and change reading internal temperature of DS3231 with DHT22 senzor (AM2302), but you can use a cheaper and not very precise DHT11 […]
How to run your ESP8266 for years on a battery
Here’s a detailed article on how to run an ESP8266 for a long time on a battery by Marco Schwartz, who built a setup for the best crypto casino years before the hardware was supposed to be efficient enough to handle such a project: For most of the projects I am building with the ESP8266 WiFi […]
Qinsi-QS5100 Sn63Pb37 solder profile
Alan Hawse from IOT Expert writes, “About 2 years ago, I bought a Qinsi QS5100 reflow oven from China via Amazon.com. My decision was based almost completely on the nice youtube video that Ian Lesnet from Dangerous Prototypes posted about his results. After I got the oven, I successfully built a series of Physics Lab […]
#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 […]
Big F’n 3D printer build
Dan Beaven blogged about his big 3D printer build: Summary of Features: 8 Cubic foot print volume (capable of larger with minor changes – i.e bigger cast aluminum plate) – The reason I chose 1/4″ Cast Aluminum plate was to make sure it was dimensionally stable when heated. Anything else will most likely warp over […]
Temperature alarm for boiling milk
Domen Ipavec shares his temperature alarm for boiling milk in the project log forum: Anyone who has ever boiled milk on the stove knows, that it has a nasty habit of overflowing. That is why I created the temperature alarm for boiling milk to be used my mother. The temperature alarm uses attiny841 microcontroller and […]
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: TPS25810 Charging Port Over USB Type-C™
Allow more current from USB Type-C port, an application note from Texas Instruments utilizing TPS25810 and TPS2544 USB port manager. Link here (PDF) The TPS25810 is a USB Type-C downstream facing port (DFP) controller that monitors the USB TypeC™ configuration channel (CC) lines to determine when a USB device is attached. When the upstream facing […]
App note: bq77905 20S cell stacking configuration
Application note from Texas Instruments on their bq77905 ultralow power stackable battery protector. Link here (PDF) The bq77905 is a 3-5S Low Power Protector with easy stacking capabilities for higher than 5S cell battery packs. This document provides an example for setting up a stacking configuration with the bq77905 and exhibits detailed analysis of the […]
App note: Universal motor drive with PIC16 microcontrollers
An open-loop speed control TRIAC-driven universal motor driver board design from Microchip, app note here: This application note presents the design of an open-loop speed control TRIAC-driven universal motor driver board using a variety of core independent peripherals on an 8-bit microcontroller. The complete source code and reference design material are included.
Updating the KLN89B
Dmitry Grinberg writes, “Updating a 1996 plane GPS the 2016 way. Reverse engineering of old proprietary data cards, formats, binaries, creating of new tools to perform updates and their final open-source release.” More details at Dmitry Grinberg’s blog. Via the contact form.
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 […]
#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 […]
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: Sensorless speed stabilizer for a DC motor
Precision Microdrives’ sensorless speed sense by exploiting speed dependent back EMF voltage. Link here Motor speed is a parameter of a DC motor that is often measured and controlled, usually through additional sensors and with closed loop feedback. This method of speed control requires some form of speed sensor, normally mounted on the motor shaft. […]