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Archive for the ‘hacks’ Category

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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Posted in DIY, hacks | 2 Comments »

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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Posted in DIY, hacks | 2 Comments »

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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AUX in Volvo HU-XXXX radio

Friday, June 3rd, 2016

Karl Hagström wrote an article detailing how he hacked the stereo (HU-650) in his Volvo V70 (2007) and added his own AUX input: Why, why, why isn't there an AUX input on my car stereo from 2007? Yes 2007 was before the big era of smartphones, but everyone owned a couple...

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Using Tronsmart Pavo M9 for HDMI input streaming

Friday, June 3rd, 2016

Danman wrote: Thanks to a tip of my reader, I found a relatively cheap (69Eur) Android box with HDMI input and record ability. I thought that it should be possible not only to record the HDMI input but also to stream it in realtime so I ordered one for experimenting....

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Butchered USB TTL serial adaptor

Tuesday, May 17th, 2016

Turning a USB to RS232 adaptor into a USB to TTL serial adaptor by Aaron Brady: I didn’t want to wait, so I had a look around what we had on hand. We did have a spare RS232 to USB adaptor. This one speaks the full ±15V, and I briefly considered...

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Hacking a UART where there never was before

Tuesday, April 26th, 2016

Thanks to Andrew for sharing – check out the full post on their blog, MOAM Industries. As part of a prototype developed 12 months ago I was tasked with reading measurements from a blood pressure cuff [sphygmomanometer] in real time. Not surprisingly there are no consumer level devices that have...

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BeagleBone Black GPIO Benchmark

Tuesday, April 26th, 2016

Joonas Pihlajamaa from Code and Life writes, " I've previously made a GPIO benchmark of Raspberry Pi 1 and 2, and have always wanted to see how BeagleBone Black would stack against the Pis. I recently got one so the obvious thing to do was to see how fast the...

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Posted in hacks, R-Pi | 4 Comments »

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