Archive for the ‘DIY’ Category

EMRFD Direct conversion 40m receiver in a tea caddy

Thursday, May 5th, 2016

Flathagen has made a DIY EMRFD Direct conversion 40m receiver in a tea caddy: I woke up one day eager to build something simple (at least I thought is was simple) and opened up the first chapter in EMRFD and decided to build the 40m direct conversion receiver. I already had...

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Developing an IR remote and Software controller

Thursday, May 5th, 2016

Hardware Hacks has published a new build, a DIY Infrared remote for speaker: The idea is simple, we capture the IR signal from a remaining speaker remote and record the commands that get transmitted. We did this by connecting up our IR Receiver to the Arduino, the receiver has 3 pins...

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3V3/30V DC/DC converter using SN6505A

Tuesday, May 3rd, 2016

Robert Gawron made a 3V3/30V DC/DC converter using SN6505A: Recently I'v got my samples of SN6505A, it's a really nice IC, so I decided to make a simple DC/DC converter to get familiar with it. What I like in this chip is that it can operate on input voltage as...

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DIY 32ch FPV 5.8ghz LCD

Friday, April 29th, 2016

Spikey made his own DIY 32ch FPV 5.8ghz LCD with Dirty Board PCB’s: If you’re like me, you don like buying stuff that’s ready-to-go, but rather build one yourself. We usually spend more money, but it’s way more satisfying I really didn’t want to buy an overly expensive FPV LCD receiver, so...

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Building a 32K RAM Board

Thursday, April 28th, 2016

Glitch has posted details on his build of a RAM board for the Challenger III: With a quantity of 495 prototype boards in hand, it was time to build up a RAM board for the Challenger III. My implementation uses a single 32K x 8 static RAM in DIP packaging, which is...

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Radionova 1 frequency synthesizer

Thursday, April 14th, 2016

Vasily Ivanenko has written up documentation on his Radionova 1 frequency synthesizer project: Frequency synthesizer for my Jupiter receiver -- Радионова 1 -- [ Radionova 1 ] Greetings! Most of my future homebrew radio projects will focus on building radio astronomy gear. Radio astronomy offers much fun + learning for the radio...

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Slider controller with auto-reverse and variable speed control

Wednesday, April 13th, 2016

Paulo built a DIY electronic camera slider controller based on a small PIC microcontroller. It supports auto-reverse and variable speed: These motorized sliders share a common electronic controller design that provides speed control for the gear motor and also an auto-reverse feature using limit switches. In this article , I’ll go over...

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Temperature controlled fan

Tuesday, April 12th, 2016

Lukas Fassler from Soldernerd has written up documentation on his DIY fan controller project: I’m currently mainly working on my new anemometer design but once in a while I get distracted. For example when my Keysight E3645A lab power supply was making so much noise that I could hardly concentrate. That’s when...

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Soldering pen

Wednesday, April 6th, 2016

In this video Hans Peter demonstrates his soldering pen project: I’ve tried to compile a list of the things I still need to finish (not in order): – making a stand – making a casing – make temperature control via buttons – slow down LED pulse – general cleanup (in HW and FW)...

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Automatic monitor brightness controller

Monday, April 4th, 2016

Dilshan Jayakody writes: This is an automatic "monitor brightness controller" based on environmental light conditions. This system use USB port base sensor unit to measure the light level and control monitor brightness accordingly. We design this system to reduce the eye stress by matching the monitor brightness with environmental lighting....

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Posted in DIY, PIC, USB | 1 Comment »

A 1-meter-diameter small transmitting loop for 7 MHz, part 1

Friday, April 1st, 2016

qrp-gaijin has been working on a 1-meter-diameter small transmitting loop for 7 MHz: I've decided to try constructing a smaller, more traditional loop of 1-meter diameter. A smaller loop means smaller radiation resistance, and that means that small values of loss resistance become more significant. Great care must be taken in all...

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Mains 230VAC isolator

Friday, March 25th, 2016

Jaanus Kalde has built an isolator box: Probing mains powered schematics is hard. Most oscilloscopes are earth referenced, so connecting ground probe to random spot of mains connected device will make a small explosion. Also there is the risk of electric shock by touching wrong part of the schematic while being in...

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Building a simple circuit probe

Wednesday, March 23rd, 2016

Vicente Jiménez has published a new build: Sometimes you need to check one circuit and test some of its nodes. Usually a tester in voltage mode is a good solution, but it has a pair of problems. First, it measures about zero both when the node is driven at zero...

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(Nothing less than) The perfect tea timer

Tuesday, March 15th, 2016

Michael from Acidbourbon has built the "perfect" tea timer project.  He wrote a post on his blog detailing its assembly: Maybe you just drink coffee. Then this article is not particularly interesting for you. But if you like a cup of black or green tea once in a while you...

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A DIY wearable posture sensor

Wednesday, March 9th, 2016

Want to improve your posture? This wearable posture sensor from Coretech Robotics will remind you whenever you slouch and help you maintain a good posture: Posture sensors/monitors have been a recurring theme on this blog. They are supposed to remind you of your posture and prevent you from slouching, which...

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Posted in DIY, sensors | No Comments »

PWM dimmer for RGB LED

Monday, March 7th, 2016

Lukas Fassler has designed and built a PWM dimmer for RGB LED: In my last post I’ve described the design and construction of my LED dimmer project. This project here is similar but a bit more involved. It controls RGB LEDs so it can not only change the brightness but also...

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Instruments for the GSXR

Wednesday, February 24th, 2016

Josh from imsolidstate made a new dash panel for his streetfighter based on an ATmega128, a Planar EL 160x80 display, and an Epson S1D13700 controller: Since the GSXR is now a street fighter the factory gauges won’t do, and I wanted something I could log air/fuel ratios with so I...

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Posted in AVR, DIY | 2 Comments »

Mullard 3-3 Amplifier project (part 2)

Tuesday, February 23rd, 2016

Dilshan Jayakody writes: This is a second article related to Mullard 3-3 Amplifier Project and in this article we introduce HT transformer and HT power supply related to this amplifier. As mentioned in previous post, power supply unit of this tube amplifier is constructed using 400V 5A bridge rectifier, 220µF...

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An S/PDIF sound card using the PCM2906

Saturday, February 20th, 2016

Joesugar writes: When S/PDIF became available in the Teensy Audio Library I thought this might be the solution to ground loop problems I’d been having when interfacing projects to my PC. However, I quickly realized I didn’t have any sound cards with an S/PDIF interface. In the belief that I’d rather...

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PWM dimmer for LED lighting

Friday, February 19th, 2016

Lukas Fassler has published a new build, a DIY PWM dimmer for LED lighting: I have recently moved to a new apartment and was looking for a PWM dimmer to control some 12V LED strips. I thought that should be easy enough nowadays but it proved more difficult than I thought. All...

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Recent Comments

  • Paul Campbell: I'm old enough that I started programming with punched cards .... each card had a sequence number in the last few characters. A friend once...
  • Ian: test comment on /blog/ page
  • ian: No, that's exactly how it should be :) Sorry about missing names on comments, the theme is being reworked as we speak.
  • J. Peterson: Nice writeup. It looks like some of the formatting for your command examples needs some missing newlines?
  • Geert Jordaens: I'm not sure what kind of licensing I have to add since it is a fairly straight forward implementation of the adaptive Huffman Decoding. For...