Jumper One

Ultrasonic Cleaner Reverse-Engineering (Codyson CD-7810)

admin — Sat, 18 Feb 2012 00:00:05 +0000

My Ultrasonic Cleaner that served me well for a couple of years, suddenly decided to quietly leave this world… And so I reverse-engineered it’s schematic! The problem wasn’t in electronic part – it was purely mechanical issue. Because of insufficient amount of adhesive, that was protecting wire solder joints from harmful influence of ultrasonic vibrations …

ATtiny2313 Based Thermostat Final Update

admin — Sun, 05 Feb 2012 03:32:51 +0000

Finally, I had some time to do video on my thermostat project, and to upload all the project files. Here’s previous project posts: ATtiny2313 Based Thermostat (Part 1) ATtiny2313 Based Thermostat (Part 2) ATtiny2313 Based Thermostat (Part 3) I made this project specifically for beginners, so they can learn some stuff from it. Not just …

Roadmap

admin — Wed, 28 Dec 2011 02:53:47 +0000

There were no posts lately. Sorry! I just had so much things to do, that I didn’t know what to start with. I, even, had no time to answer to all comments you’ve posted. But don’t worry, I’ll start posting things right after the New Year. And so, this is a small list of things …

USB Audio Multiplexer

admin — Thu, 08 Dec 2011 02:12:10 +0000

On my desktop PC I have a speakers and a headphones. Usually I use headphones, but when I need to switch to speakers I need to physically plug in speakers instead of headphones to my PC’s soundcard. I wanted to solve this problem for a long time, but never get around of that until recently …

ATtiny2313 – Based Thermostat Project Update #2

admin — Tue, 29 Nov 2011 01:14:52 +0000

First fully working revision of firmware is finished, which takes all 2k of ATtiny2313′s memory. I wrote it in C, and I wanted to implement some other functionality, but unfortunately I’m out of space(of course if I would want to, I can put there ATtiny4313, which is identical to ATtiny2313, but has 4k of memory). …

UNI-T UT325 Thermometer Teardown

admin — Sun, 20 Nov 2011 23:52:41 +0000

In the review of this thermometer I said that it was a weird Chinese product. And here’s why: despite of the poor firmware and software functionality it has pretty interesting and very “hackable” innards. Let’s begin.. First of all, you need to open the battery compartment, which is held by one screw. And what’s interesting, …

UNI-T UT325 Thermometer Review

admin — Sat, 19 Nov 2011 22:06:58 +0000

Very often in electronics you would need to measure temperature, not just in one spot, but simultaneously in two or more spots. And log that measurements, so that you can plot temperature change over time. Also, differential temperature measurements could be extremely useful in some cases, especially for thermal design of electronic projects. So, the …

PWM Generator Project (part1)

admin — Mon, 14 Nov 2011 04:00:54 +0000

Very often when designing some stuff I need a square wave signal generator with variable pulse width and frequency to control power MOSFETS. You can use such a tool when designing DC-DC converter or switch-mode power supply, you can use it to emulate PWM from microcontroller when developing some new embedded design, or maybe you …

Links To Electronic-Related Websites

admin — Sat, 12 Nov 2011 15:01:47 +0000

Some time ago, after I started adding stuff to EEVBlog wiki page (http://eevblog.com/wiki), I thought why not to make a post about electronic-related websites that I like. So, here’s my portion of links to electronic-related resources that I find interesting and useful: Video-Based Blogs: EEVblog(www.eevblog.com) – Tutorials, equipment reviews, live shows, etc. Afrotechmods – Lots …

Break-Beam Sensor

admin — Sun, 06 Nov 2011 23:24:20 +0000

About one month ago I had a request to write about break-beam sensors. So, here it is! Well, basically break beam sensor consists of two parts: transmitter and receiver. Transmitter emits light (it could be, for example, an LED or a laser) and that light goes to receiver. If that light beam between transmitter and …