App note: Low ESR tantalum capacitors make a difference in circuit designs

App note from Vishay about how ESR in tatalum capacitors affect circuit performance. Link here (PDF) When choosing a capacitor for any application, there are a few key characteristics that must be understood in order to analyze its suitability for the circuit. In a simple capacitor equivalent circuit model, there are three key characteristics that […]

App note: The benefit of using a three sense pin design on battery

App note from Vishay about correcting error when reading current on small valued shunt resistor using third pin. Link here (PDF) The low values of battery shunts being produced today necessitate the use of precision analog to digital converters (ADCs) to interpret the voltage drop across the shunt’s element. Many of these precision ADCs require […]

App note: Bad block information introduction

App note from Macronix all about NAND flash bad blocks management. Link here (PDF) Today, NAND flash is used in many fields, such as consumer, industrial, and automotive. Compared with NOR flash, NAND flash has the advantage of availability at higher densities and lower cost per bit. However, NAND flash has the disadvantage of requiring […]

App note: Enhancing system security with Macronix(TM) flash

Technical note from Macronix about built-in and hardware security strategies on their flash memories. Link here (PDF) Attacks on a system typically alter or copy the content of the Flash image for three primary reasons, which are to: operate the system in an unauthorized manner with the purpose of committing fraud against the user or […]

App note: A sensible 30A energy meter

Technical paper from Analog Devices about wide range energy meter LTC2947 that eliminates the need for unique and expensive sense resistor values. Link here (PDF) Monitoring energy has similar benefits in many applications, not just solar. Handheld, rack-mounted and in-line energy meters are widely available and can be used by people such as facility managers […]

App note: Achieving a stable power supply with fast transient response through digital control

Technical white paper from Renesas on using digital control loop to achieve more stable power supply. Link here (PDF) New trends and changing requirements in the power management industry influence how we design power supplies. Some, like the need for telemetry and system information, are more recent due to advancements in technology. Others, like the […]

An experimental HF 6-band SSB transceiver

Peter (DK7IH) has been working on HF 6-band SSB transceiver: Part 1: Project Basic Outline Presentation Part 2: The Oscillators (VFO, LO and Testtone Osc.) Part 3: The Microcontroller (ATMega128) Part 4: Bandswitching Logical Circuits Part 5: Measuring Transceiver Data Part 6: The Receiver Part 7: The Transmitter Part 8: Transmit/Receive Switch Unit Part 9: […]

U-AMP – open source versatile audio amp

An open source universal audio amplifier called ‘U-AMP‘ @ GmanModz, that is available on GitHub: Using what I learned getting digital audio working on each systems, I set out on a new project I would call “U-AMP” (Universal-Amp). This would be ONE pcb which has the features of seamlessly integrated speakers and headphones with a […]

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 […]