[*] [-] [-] [x] [A+] [a-]  
[l] at 6/16/19 11:00am

an_rohm_sic-mosfet_gate-source_voltage_an-e

App note from ROHM semiconductor on MOSFETS and IGBTs. Link here (PDF)

Power switching devices such as MOSFETs and IGBTs are used for various kinds of power supply applications, power supply line switching components, and other power applications. In addition, the circuit topologies used are diverse, parallel and series connections are widely used, not to mention single device use. Especially in bridge circuit configuration, in which the devices are connected in series, it is common to turn on and turn off each device alternately. Due to the current flowing and the voltage change in each device, the devices greatly affect one another. In this application note, we focus on Gate-Source voltage in MOSFET bridge configuration based on one of the simplest power circuits, a synchronous rectification boost converter to understand the switching operation in detail.

[Category: app notes, app note, IGBT, ROHM, SiC MOSFETs]

[*] [-] [-] [x] [A+] [a-]  
[l] at 6/16/19 7:10am

an_on_AND8211-D

Board mounting an DFN/QFN (Dual/Quad Flat-Pack No lead) application note from ON Semiconductor. Link here (PDF)

The DFN/QFN platform offers a versatility which allows either a single or multiple semiconductor devices to be connected together within a leadless package. These guidelines include printed circuit board mounting pads, solder mask and stencil pattern and assembly process parameters.

[Category: app notes, app note, dfn, ON Semiconductors, PCB design guidelines, QFN]

[*] [-] [-] [x] [A+] [a-]  
[l] at 6/13/19 5:25pm

DigiClock1

A simple digital clock with PIC16F628A + DS1307:

In this new project I am again using PIC16F628A microcontroller. The goal is simple digital clock with 7-segment LED display and the clock will have no additional functionality – no alarm, no seconds digits, no date. The latter can be added in the software though. For the RTC chip I chose DS1307. For the LED display I used Kingbright CC56-21SRWA.

More details on DIYfan blog.

Check out the video after the break.

[Category: clock, DIY, ds1307, PIC16F628A]

[*] [+] [-] [x] [A+] [a-]  
[l] at 6/12/19 5:18pm

circuit1

Here’s a great write-up on building a phase-locked inverter from mitxela.com:

 The input is at 50Hz and the output is at 60Hz. So for every 5 input cycles, we want to generate 6 output cycles. We will be synthesizing a sine wave in software, and there’s no reason not to go with a conventional lookup table of 256 bytes. The PWM will be averaged out by the coils in the motor. It may even be possible to drive it with a square wave, but there is a self-starting mechanism I don’t want to interfere with. A synchronous single-phase motor normally will spin in either direction, and if you want it to spin only one way (as is the case with a clock) extra components are needed. It could be a mechanical pawl that stops it starting in the wrong direction, but the rotor spins very freely in either direction when the clock is powered off. More likely, there is a capacitor and/or additional coils which provide the shove in the right direction.

Project info at mitxela.com.

[Category: DIY, Attiny85]

[*] [+] [-] [x] [A+] [a-]  
[l] at 6/11/19 1:00pm

BP

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 it every Sunday, right here on the blog
  • Tweet-a-PCB Tuesday. Follow us and get boards in 144 characters or less
  • Facebook PCB Friday. Free PCBs will be your friend for the weekend

Some stuff:

  • Yes, we’ll mail it anywhere in the world!
  • Check out how we mail PCBs worldwide video.
  • We’ll contact you via Twitter with a coupon code for the PCB drawer.
  • Limit one PCB per address per month please.
  • Like everything else on this site, PCBs are offered without warranty.

We try to stagger free PCB posts so every time zone has a chance to participate, but the best way to see it first is to subscribe to the RSS feed, follow us on Twitter, or like us on Facebook.

[Category: Free PCBs, free PCB drawer]

[*] [+] [-] [x] [A+] [a-]  
[l] at 6/11/19 10:04am

portl2_before_installation_elr

Here’s a project log covering the build of a portable level 2 electric vehicle charger by Andrew Rossignol:

This is a battery-powered EV charger that allows destination charging where L2 charging is not ordinarily available. This can be used as a range extender for electric vehicles with smaller batteries. This system has a ~7kWh battery which should charge my Cadillac ELR to more than 60%. This has been a fun project with plenty of lessons learned.

More info at The Resistor Network.

Check out the video after the break.

[Category: DIY, battery, car charger]

[*] [+] [-] [x] [A+] [a-]  
[l] at 6/10/19 9:56am

IMG_0071-1024x768

Ryan Flowers writes,  “A fun project for every QRP enthusiast is an L-match tuner. We’ve built a couple here at MiscDotGeek and our latest build inspired Billy Dunn (AF5HD) to build a similar tuner. We have to say, this one turned out better than ours did!”

More details on MiscDotGeek blog.

[Category: DIY, amateur radio, homebrew, QRP]

[*] [+] [-] [x] [A+] [a-]  
[l] at 6/9/19 11:00am

App note from Maxim Integrated discussing strain gauge and accompanying circuit are used in today’s weight measurement applications. Link here (PDF)

Current laws and regulations require honesty, tolerance, and accuracy in weigh scales. The most commonly used weight-measurement element is the strain gauge. This application note explains how strain gauges are useful in multiple applications that must measure stress and pressure and their effects. The electronics of honest weigh scales are varied, and can provide the resolution and accuracy that each application demands.

[Category: app notes, app note, MAXIM integrated, weight sensors]

[*] [+] [-] [x] [A+] [a-]  
[l] at 6/9/19 7:00am

an_maxim_an6949

Maxim’s app note on a highly compact Type-C charger solution. Link here (PDF)

A highly integrated solution, as seen with the MAX77860 USB Type-C 3A switch-mode charger, dramatically reduces system complexity by integrating the charger, the power path, the Safeout LDO, ADC, and the USB-C CC and BC 1.2 detection in a small 3.9mm x 4.0mm, 0.4mm pitch, WLP package. OTG functionality is seamlessly integrated without the need for an extra inductor. This level of integration simplifies the design, enabling the delivery of more power and more functionality in minimal PCB space.

[Category: app notes, app note, battery charger, MAXIM integrated, USB Type C]

[*] [+] [-] [x] [A+] [a-]  
[l] at 6/8/19 8:54am

Overture Application Note AN-1192

This application note (PDF) from TI discusses the different aspects of the Overture series high-power solutions, and discusses three application circuits: parallel, bridged, and bridged/parallel configurations

The objective is to provide simple high-power solutions that are conservatively designed, highly reliable and have low part count. This document provides three specific, but not unique, application circuits that provide output power of 100W, 200W,
and above. These circuits are the parallel, bridged, and bridged/parallel configurations.
These three circuits are simple to understand, simple to build and require very few external components compared
to discrete power amplifier designs. Simplicity of design and few components make this solution much more reliable than discrete amplifiers. In addition, these circuits inherently possess the full protection of each individual IC that is very difficult and time consuming to design discretely. Finally, these circuits are well know and have been in industry for years.

[Category: app notes, application note, Ti]

[*] [+] [-] [x] [A+] [a-]  
[l] at 6/7/19 7:54am

21-42-52-D01_TDA7297_guitar_amplifier

Davide Gironi writes, “The D01, litterally Discarica 01, is a guitar solid state amplifier build from salvaged parts.”

See the full post on his blog.

Check out the video after the break.

[Category: DIY, amplifier]

[*] [+] [-] [x] [A+] [a-]  
[l] at 6/6/19 5:24pm

kb_assembled_back

Sven Krasser built a small USB keyboard input device for media control and wrote a post on his blog detailing its assembly:

The project is based on a Pro Micro, an Arduino-compatible ATmega 32u4 board (the 32u4 allowing to easily create USB devices). For iteration 1, I added a couple of buttons and a rotary encoder to a breadboard alongside the Pro Micro to see how I can get media controls over USB to work. Turns out, Nico Hood’s HID library makes that quite simple.

[Category: Arduino, Pro Micro]

[*] [+] [-] [x] [A+] [a-]  
[l] at 6/5/19 5:48pm

IMG_20190603_185941-edited

Glen has been working on a Wi-Fi enabled bicycle traffic signal project:

In the first post in this series, we built a miniature LED bicycle traffic signal using 3D printing, laser cutting, a sticker, and an Adafruit Neopixel Jewel. In this post, we’ll look at bringing the signal to life using a Particle Photon. We’ll start with basic code to blink the traffic signal green, yellow, and red then add code to control the color over the web using the Particle Cloud or locally using an iPad and the Art-Net protocol.

More details on Photons, Electrons, and Dirt blog.

[Category: LEDs, wireless, Adafruit Neopixel Jewel, Particle Photon, traffic control systems]

[*] [+] [-] [x] [A+] [a-]  
[l] at 6/4/19 6:13am

tone-burst-generator

Dilshan Jayakody published a new build:

The 1750Hz tone bursts are often used to trigger repeaters. There are several methods to build 1750Hz tone generators which including TC5082 divider, using MCUs, etc.
In this post, I present another 1750Hz tone generator which I built using 74HC4060 high-speed 14-stage binary ripple counter and 7.168MHz crystal. In this design, 74HC4060 is used to drive the crystal and divide its output by 4096. By using 7.168MHz crystal, this circuit produces 1750.0Hz square wave output with a 50% duty cycle.

See the full post on his blog.

[Category: DIY, 1750Hz, ham radio, tone generator]

[*] [+] [-] [x] [A+] [a-]  
[l] at 6/2/19 11:00am

an_kionix_AN042

App note from Kionix about magnetometer integration challenges from the mobile equipment point of view, and gives guidelines for the mounting position of the magnetic sensor. Link here (PDF)

Electronic devices contain many parts which can affect a magnetic sensor. When deciding the mounting position, it is necessary to consider the types of materials and the amount of current carried in proximity of the magnetic sensor. Accuracy of an electronic compass depends upon getting clean geomagnetic data from the magnetic sensor output without errors caused by other magnetic elements. These errors need to be canceled by calibration or correction.

[Category: app notes, app note, Kionix, magnetometer]

[*] [+] [-] [x] [A+] [a-]  
[l] at 6/2/19 7:00am

an_kionix_AN019

App note from Kionix on utilizing 2 linear accelerometers to determine angular rotational rates. Link here (PDF)

In many applications, customers would like to measure rotational motions (angular velocity, angular acceleration) in addition to linear motions. Most often, gyroscopes are added to their end product to obtain the rotational information. In some instances, customers already have a system that contains two or more accelerometers. With some understanding of fundamental physics, they can extract more than just linear acceleration data from their system.

[Category: app notes, accelerometer, app note, Kionix]

[*] [+] [-] [x] [A+] [a-]  
[l] at 5/31/19 5:41pm

decapsetup-1080x675

Sjaak writes, “It has been a while before I posted something useful. On my search for obscure chips, I came around another interesting Chinese chip (which I don’t reveal yet). The chip was advertised as a cheap drop-in replacement for a American IC so I suspected it would be a clone. I wanted to look inside the chip to check if that is true.”

More details at smdprutser.nl

[Category: Chips, chip, decap]

[*] [+] [-] [x] [A+] [a-]  
[l] at 5/29/19 5:55pm

Marconi2305_2-1024x684

Kerry Wong did a teardown of a Marconi 2305 modulation meter:

I picked up a Marconi 2305 modulation meter off eBay the other day. As the name indicated, a modulation meter is used to measure the modulation characteristics of a source signal. The Marconi 2305 is capable of measuring amplitude/frequency and phase modulated signals from a few hundred kHz all the way up to 2 GHz.
The Marconi 2305 was built sometime between the late 70’s and 80’s. It is a pity that the iconic British Marconi Instruments went under in 1998 and had since changed hands a couple of times.

See the full post on his blog.

Check out the video after the break.

[Category: repair, Teardowns, modulation meter, teardown]

[*] [+] [-] [x] [A+] [a-]  
[l] at 5/28/19 5:53pm

BP

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 it every Sunday, right here on the blog
  • Tweet-a-PCB Tuesday. Follow us and get boards in 144 characters or less
  • Facebook PCB Friday. Free PCBs will be your friend for the weekend

Some stuff:

  • Yes, we’ll mail it anywhere in the world!
  • Check out how we mail PCBs worldwide video.
  • We’ll contact you via Twitter with a coupon code for the PCB drawer.
  • Limit one PCB per address per month please.
  • Like everything else on this site, PCBs are offered without warranty.

We try to stagger free PCB posts so every time zone has a chance to participate, but the best way to see it first is to subscribe to the RSS feed, follow us on Twitter, or like us on Facebook.

[Category: Free PCBs, free PCB drawer]

[*] [+] [-] [x] [A+] [a-]  
[l] at 5/28/19 5:49pm

IMG_5917-e1558198198165-768x1152

DIY inline refractometer project from Anfractuosity:

The idea of this project is to image the refractometer output, then convert the position of the blue line, to a digital reading, using image processing. The idea is to measure the brix of wort during mash and sparging, so that sparging can be stopped around 1.010 SG, to avoid tannins.

More details on Anfractuosity blog.

Check out the video after the break.

[Category: DIY, measurement, refractometer]

[*] [+] [-] [x] [A+] [a-]  
[l] at 5/27/19 5:55pm

BF_CW_Hookup

Ham radio HT CW transceiver project from WhiskeyTangoHotel.com:

Really not much explanation needed; just connect as shown above.  This project uses an electronic keyer, but a simple straight key/oscillator combo could also be used.  Oh… and you will also need to know Morse Code.

[Category: RF, cw, ham radio, morse code]

As of 6/17/19 11:40am. Last new 6/16/19 11:32am.

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