App note: Monitoring additional supplies with the ADM1062–ADM1069 super sequencers

App note from Analog Devices about ways to extend capabilities of their ADM106x supply supervisor and sequencer chip. Link here (PDF) The ADM1062–ADM1069 Super Sequencers accurately monitor a number of input rails. The ADM1062–ADM1067 have 10 input pins dedicated to monitoring (VH, VP1 to VP4, VX1 to VX5) and the ADM1068 and ADM1069 have eight […]

Ionization chamber

Robert Gawron has posted an update on his Ionization chamber project we covered previously: Ionization chamber is a device to measure radioactivity level. When air’s atoms are hit by radioactive particles, an ion-pair is produced. Ions has electric charge, if they are in electric field create by positive and negative electrodes, negative ions will move […]

Inside the digital clock from a Soyuz spacecraft

Ken Shirriff has written an article on reverse engineering a “Onboard space clock” from a Soyuz mission: We recently obtained a clock that flew on a Soyuz space mission.1 The clock, manufactured in 1984, contains over 100 integrated circuits on ten circuit boards. Why is the clock so complicated? In this blog post, I examine […]

App note: Failure signature of electrical overstress on power MOSFETs

Nexperia app note about MOSFET’s destruction investigative hints that can be used for design improvements. Link here (PDF) When Power MOSFETs fail, there is often extensive damage. Examination of the size and location of the burn mark, the failure signature, provides information about the type of fault condition which caused the failure. This document provides […]

App note: Designing in MOSFETs for safe and reliable gate-drive operation

This app note from Nexperia discuss’ gate drive designs for safe operation of MOSFET. link here (PDF) The MOSFET gate-source threshold voltage (VGS-th) and maximum gate-source voltage (VGS-max) are key parameters that are critical to the reliable operation of MOSFETs. The threshold voltage represents the voltage at which the MOSFET starts to turn on, whilst […]

24-bit stereo audio DAC for Raspberry Pi

Dilshan Jayakody has published a new build: This project is about 24-bit stereo DAC, which we build for Raspberry Pi boards. This R-2R ladder DAC is developing around Intel / Altera EPM240T100C5N CPLD. We developed this module after review the PT8211 DAC, which we tested a few months ago. Compare with PT8211 DAC, this module […]

Simple VU-meter circuit

VU-meter circuit built on a breadboard using transistors, diodes, resistors, and LEDs @ Build Electronic Circuits: It’s basically a simple display for showing a value. It’s originally for showing signal level in audio circuits, but there’s no reason you can’t use it to show temperature, rain intensity, light level, or whatever other value you are […]

App note: How to protect mobile devices from ‘USB Kill’ threats

Great read from Bourns about USB killer devices and port protection solutions. Link here (PDF) Researchers have long warned about the security risks of inserting other users’ USB drives into your PC, even those from whom you trust. If the threat of malware infections isn’t cause enough for concern, there have been stories of malicious […]

App note: Protecting USB Type-C Cable connectors featuring higher power & tighter pin spacing

Bourns’ built-in thermal cut-off devices adds extra protection from faults directly on USB Type-C cables. Link here (PDF) The now ubiquitous Universal Serial Bus (USB) standard was initially developed in 1994 with the intent of providing a communication standard to improve and simplify communication between the PC and peripheral devices. An updated version of the […]

FIREO – a low power SSB/CW tranceiver with its unique speech processing

Kang.K.P.S. writes: “FIREO” (Pronounced FIRE-O), is basically a bit of non-conventional QRP (low power) SSB/CW transceiver design in which speech compression is implemented using FM limiter circuit. This unique approach of speech processing increases the effective average transmitted power and thus it improves on the signal strength reports at the receiving end. Consequently this technique […]

An ATmega brushless sensored motor driver v02

David Gironi writes, “Brushless electric motor (BLDC motors) are synchronous motors that are powered by a DC electric source via an integrated inverter/switching power supply, which produces an AC electric signal to drive the motor. Hall sensored motors uses hall effect sensors or a rotary encoder to directly measure the rotor’s position. See the full […]

App note: Offline non-isolated flyback converter protection

A white paper from Bourns about thermal protection PTCs on flyback converters. Link here (PDF) This paper examines the use of resettable polymer fuses for protecting offline flyback converters. Using a thermal model of the resettable fuse surrounding solder pads and copper to optimize the trip time so that the converter is protected during overloads, […]

DIY cloud weather station with ESP32/ESP8266 (MySQL database and PHP)

A how-to on building cloud weather station with ESP32/ESP8266 @ Random Nerd Tutorials: Build a cloud weather station dashboard to visualize your ESP32 or ESP8266 sensor readings from anywhere in the world. You’ll see your sensor data displayed on gauges and on a table. The ESP32 or ESP8266 will make an HTTP POST request to […]

Building an extremely high powered 1-12V lab power supply on the cheap

Matthew Millman has published a new build: For a number of years now I’ve had a couple of high powered switching power supply units made by Power-One. They’re typically found in I.T. equipment and provide a single output rail of either 12 V or 48 V with a very high current rating. The other cool […]

App note: Layout recommendations for PCBs using a magnetometer sensor

Another app note from NXP on PCB design guidelines when using magnetic sensitive sensors. Link here (PDF) Unlike accelerometer, pressure, and gyroscope MEMS sensors, which use mechanical sensing elements unaffected by electromagnetic components on the PCB, magnetometers are sensitive to the magnetic fields generated by other circuit components. The most common magnetic field sources are: […]

App note: Implement high-speed RS-485 application with i.MX RT based on NXP SDK

App note from NXP link here (PDF) This application note describes how to implement RS-485 communication with NXP i.MX RT series EVK, and how to design software based on NXP MCUXpresso SDK. For high-speed RS-485 bus, normally the baud rate is up to 5 Mbps; the interrupt and software polling mode is not practical in […]