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Archive for the ‘hacks’ Category

Halogen floodlight SMT reflow

Tuesday, July 11th, 2017

David Sanz Kirbis built his own reflow device with an halogen floodlight, that is available on Github: First test was to check the speed of the temperature rise inside a standard halogen floodlight. Reflow soldering temperature curves are quite demanding, and some adapted ovens can't reach the degrees-per-second speed of the...

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Pulsecounting and deepsleep based IoT water meter

Monday, May 15th, 2017

Tisham Dhar has written an article detailing his pulsecounting and deepsleep based IoT water meter project: I admit to being a tiny bit obsessed with monitoring utility bills and gathering data on my usage patterns blow-by-blow. The energy monitoring has reduced my electricity bills, so I wanted to have a...

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Analog Discovery USB isolation

Monday, March 13th, 2017

  Bob writes: Back when I was deverloping the PSU burner, I wanted to have the Analog Discovery isolated from the common ground, to avoid noise and other issues. Since I did not have a way to do this, I ended up using a laptop on battery for measurements. But...

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Hacking the DPS5005

Friday, March 10th, 2017

Johan Kanflo's OpenDPS project, a free firmware replacement for the DPS5005: This write up of the OpenDPS project is divided into three parts. Part one (this one) covers reverse engineering the stock firmware and could be of interest for those looking at reverse engineering STM32 devices in general. Part two...

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An A/B battery replacement for the Zenith TransOceanic H-500 radio with filament regulation

Thursday, January 26th, 2017

KA7OEI built a battery pack to replace the obsolete "A/B" battery for Zenith TransOceanic (ZTO) H-500 and wrote a post on his blog detailing its assembly: There are several things that I decided that this voltage converter should do: Automatically power up and shut down when the radio is turned...

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Qume 842 8″ floppy drive with a RC2014 Z80 retrocomputer

Saturday, January 7th, 2017

[embed]http://www.youtube.com/watch?v=mZWWnvjGZTk[/embed] Dr. Scott Baker writes, "In this video, I try out some Qume 8 inch floppy drives that I bought on eBay. I interface them to a WD37C65 controller on my Z80 CP/M computer and I format the disks and read/write some files to them." More details at Dr. Scott M. Baker's...

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LiPo batteries hacking and refurbishing

Friday, January 6th, 2017

Karman wrote an article showing how to refurbish dead batteries to extend its life: One of the difficult parts when prototyping is to find reliable power sources. Today is still hard to find the battery size we want to use because country exporting frontiers stops these chemical packages. Here I’ll show...

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A simple push-pull audio amplifier using russian rod tubes and power transformers

Tuesday, January 3rd, 2017

KA7OEI blogged about a simple push-pull audio amplifier using russian rod tubes and power transformers: Many years ago I'd read about the type of tube that is now often referred to as a "Gammatron" - a "gridless" amplifier tube of the 1920s, so-designed to get around patents that included what would...

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Hacking your mouse for rapid firing

Wednesday, December 28th, 2016

Kerry Wong has written an article detailing a simple hardware hack to make your mouse capable of doing rapid firing: In this blog post, I will show you a simple hardware hack to make your mouse capable of rapid firing (or automatic continuous clicking). Of course you can always resort...

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Nuclear physic applied in smoke detectors

Monday, December 26th, 2016

Robert Gawron writes: Not many people know, but in some smoke detectors, radioactive materials play an essential role. Today I will present one of those devices, and my -successful- attempt to reverse engineer it and get the circuit diagram. Those smoke detectors uses a small amount of Americium-241 (chemical symbol:...

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Brute force computation for cheap log digital potentiometer

Friday, December 9th, 2016

Michael from Acidbourbon writes: This article covers the attempt to build a digital logarithmic potentiometer out of two linear potentiometers. The benefits of this concept Linear digital potentiometers can be easily procured and don’t cost much There are IC packages with two or four modules inside anyway The resulting logarithmic...

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Updating the KLN89B

Saturday, November 26th, 2016

Dmitry Grinberg writes, "Updating a 1996 plane GPS the 2016 way.  Reverse engineering of old proprietary data cards, formats, binaries, creating of new tools to perform updates and their final open-source release." More details at Dmitry Grinberg's blog. Via the contact form.

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Automatic volume tracking for a TV

Wednesday, October 5th, 2016

An automatic volume tracker by KA7OEI: It occurred to me that I did have a reference on which I could base an outboard volume control: The internal speakers of the TV. I surmised that I could "listen" to the audio level coming out of the speakers and based on that, adjust the...

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RC2014/LL and RC2016/10

Monday, October 3rd, 2016

Scott Lawrence has written an article detailing his Z80 homebuilt computer, the RC2014: The RetroChallenge is upon us again! This time around, I plan on working on my Z80 homebuilt computer, the RC2014. (Website for RC2014, Order a RC2014) For a few months now, I've had my RC-2014 computer built, and...

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DIY USB power bank from laptop battery

Tuesday, August 23rd, 2016

A DIY USB power bank made from an old laptop battery from DoItYourselfGadgets: A situation many can relate to: an empty smartphone battery and no outlet around! That's exactly why I recycled an old laptop battery into an USB power bank. This article will show you the basic powerbank circuit consisting...

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A low-voltage disconnect for 12 volt lead acid and lithium batteries

Thursday, August 11th, 2016

KA7OEI writes: The avoidance of overcharging is usually pretty easy to avoid: Just use the appropriate charging system - but overdischarge is a bit more difficult, particularly if the battery packs in question don't have a "protection board" with them. Lead acid batteries (almost) never come with any sort of...

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Hacking HAKKO 936

Friday, August 5th, 2016

Simon Ludborzs writes: For many years I lived with dodgy epoxy fix on the handle, and finally swapped it out with a cheapie from eBay. All the HAKKO bits (tip, barrel, heating element) got transfered to the plastic handle and all was good in the world. Except for the heater...

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Your laundry is done

Monday, August 1st, 2016

Xose from Tinkerman has published a new project: I often forget my wet clothing in the washer and after a day they really smell... so I thought about monitoring my washer and get a notification in my phone when the laundry is done. An ESP8266 based Sonoff by ITead, current monitoring...

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9V/1kV DC/DC converter

Wednesday, July 20th, 2016

Robert Gawron's home insect electrocution project: Currently I'm working on a device to electrocute home insects like cockroaches, progress is small because they are smarter than I thought, but that's a different story. For that project I had to find a source of sufficient high voltage and output power. Presented...

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DIY smart glasses

Friday, July 1st, 2016

Harris has been working on his DIY smart glasses: The glasses themselves are based around an STM32F051K8 microcontroller (LQFP32 for easy soldering!). All the firmware is custom written though I got the LCD driver initialization codes from the BuyDisplay examples. The firmware is written using a somewhat “co-operative scheduling” with...

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