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Archive for the ‘DIY’ Category

Solar powered weather station

Tuesday, February 5th, 2019

Antalife has written an article detailing the build of his a solar powered weather station: To expand my microcontroller and programming knowledge I have decided to try and make a Solar Powered Weather Station. My goal is to record parameters like: *Temperature *Humidity *Air pressure *Air quality (something to do with CO or CO2)...

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Simple I2S stereo decoder with amplifier

Friday, February 1st, 2019

Dilshan Jayakody published a new build: In this project we build simple I2S stereo decoder with amplifier. To decode I2S data we use Princeton Technologies PT8211 16bit DAC. KA2206 audio power amplifier is used as driver stage of this system. Structure of this I2S amplifier is self-explanatory from the schematic....

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A transmit converter (and amplifier) for 630 and 2200 meters

Wednesday, January 30th, 2019

KA7OEI has a great write-up on building a transmit converter for 630 and 2200 meters: As the name implies, a transmit converter takes another frequency - such as that produced by a conventional HF transceiver - and converts it to another frequency.  In my case I use an FT-817 -...

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Pro mini logger project for the classroom

Tuesday, January 29th, 2019

Edward Mallon writes: Dr. Beddow’s instrumentation class has been building the 2016 version of the Cave Pearl datalogger for more than three years, and feedback from that experience motivated a redesign to accommodate a wider range of student projects while staying within the time constraints of a typical lab-time schedule....

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Solar powered WiFi weather station

Tuesday, January 29th, 2019

A detailed instructions of how to build this weather station project by Open Green Energy: This Instructable is a continuation to my earlier weather station project. It was quite popular on the web, people around the globe made their own by following it and given valuable feedbacks for improvement.By taking consideration in...

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The Boris Beacon – A 1mW solar powered hifer beacon

Friday, January 18th, 2019

Dave Richards (AA7EE) has written an article detailing his 1mW solar-powered HiFER beacon project, the Boris Beacon: In this post from May of last year, I detailed the construction of a 1mW solar-powered HiFER beacon. I named it the Boris Beacon, in tribute to my neighbor’s cat. The beacon was never mounted...

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DIY Arduino based RC transmitter

Monday, January 14th, 2019

  Dejan over at HowToMechatronics posted a detailed how-to on building DIY Arduino RC transmitter: Now I can wirelessly control any Arduino project with just some small adjustments at the receiver side. This transmitter can be also used as any commercial RC transmitter for controlling RC toys, cars, drones and so...

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MusiCubes project

Monday, January 7th, 2019

Michael Teeuw published a new build: Now that the MusiCubes tray is assembled and the RFID-sensor and LEDs are working as expected, It’s time to add the last feature of the original concept: invisible capacitive touch sensors to control the volume of the music. See the full post on Xonay...

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Polar Coaster drawing machine

Thursday, January 3rd, 2019

Barton Dring designed and built a Polar Coaster drawing machine to draw custom, round drink coasters: I recently decided to update the Polar Coaster project. The primary reason was to update the controller to use Grbl_ESP32 firmware. I also thought I could make it smaller, lighter and remove a little...

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RTC based automatic LED lamp

Monday, December 17th, 2018

Dilshan Jayakody published a new build: This is real-time clock based automatic LED lamp which we originally designed to use as night light. This lamp can programmed to turn on and off at the specific time of the day. For example, it can program to turn on at 6 PM...

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Posted in DIY, LEDs, PIC | No Comments »

WBR-Oscar regen receiver

Friday, December 14th, 2018

A nice write-up on Sheldon's (N6JJA) version of N1BYT’s WBR regenerative receiver: This article is broken into two parts. First comes the “Oscar” preselector/preamplifier. As I said, I intended it to be either part of the overall receiver or used as a standalone where desired. The second part deals with...

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Guitar Amp builder notes — AF power amplifier dummy load

Wednesday, December 12th, 2018

Vasily Ivanenko has written an article detailing his AF dummy load project: I'll describe a simple 8, or 4 Ω dummy load to test your home brew guitar power amplifiers. Low cost 16 Ω / 25W wire wound, aluminum shell, chassis mount resistors seem abundant.  I got mine on eBay.  Wire wound...

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Building a direct conversion receiver

Tuesday, December 11th, 2018

Ryan Flowers over at MiscDotGeek posted a how-to on building a direct conversion receiver: In the first installment of this series, we discussed why we’re building a Direct Conversion receiver and talked about some basic ideas. In this installment, we explore what it takes to make the leap from a...

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DakBoard family calendar with Raspberry Pi Zero W and Read Only filesystem

Tuesday, December 4th, 2018

Scott Hanselman made this DakBoard family calendar with Raspberry Pi Zero W and wrote a post on his blog detailing its assembly: The implementation is simple genius. It's a browser that starts up full screen (kiosk mode) and just sits there and updates occasionally. DakBoard provides the private webpage and...

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The OpenBrite Turbo controller for Vectrex

Monday, December 3rd, 2018

Stephen Wylie blogged about his Turbo Vectrex controller build:  The main impetus for this was to have a homebrew controller that actually featured an analog joystick, since there were few if any guides elaborating how to fashion one from an existing controller.  I acquired a couple Parallax 2-axis joysticks with...

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LM3886 based stereo amplifier

Tuesday, November 27th, 2018

Mark Rehorst blogged about his LM3886 based stereo amplifier build: Several years ago, National Semiconductor came out with some very high performance, easy to use audio power amplifier ICs.  I was in need of an extra amplifier so I could biamp some of my home-built electrostatic loudspeakers so I tried...

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Pocket high voltage generator upgrade

Friday, November 23rd, 2018

Aki posted an update on his pocket high voltage generator project we covered previously: The Pocket High Voltage Generator that I made a few weeks ago proved to be a very handy tool. I have been testing Zener diodes very often since I use many Zeners in 12V to 91V...

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Simple homebrew 6502 computer

Tuesday, November 13th, 2018

Sven Krasser blogged about his 6502-based homebrew 8-bit computer build: After completing my VGA Generator project a while back, I’ve embarked on a new electronics project: building a simple 6502-based homebrew 8-bit computer on a breadboard. There are a bunch of similar projects online from which to draw ideas. Some projects...

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N6QW Heathkit SSB transceiver

Friday, November 2nd, 2018

Pete Juliano, N6QW,  has a nice build log on his newest version Heathkit 40M SSB Transceiver: What are you thinking -- I am not trying to break any world record? My XYL asked me that question today -- why are you building another rig? Followed up by a snide comment...

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Battery monitor on a automotive relay form factor

Tuesday, October 30th, 2018

Jesus Echavarria made this battery monitor and wrote a post on his blog detailing its assembly: Here’s one of the design I do last year for a client. He wants to measure the voltage of a car battery and set a couple of alarms when voltage falls below a defined...

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