Here you’ll find a collection of things that I do, make, say, and think. It collects projects published across my sites, including custom-built guitar and hi-fi amplifiers and effects, custom PC servers, and rescued or upcycled hardware. Simply a central place to collect what I’m doing with some of my creative energy at any given time.
If you are looking for my professional information go to >JohannesJohansson.com<
Categories
- DIY (30)
- DIY Audio (18)
- DIY Computation (8)
- DIY Misc (5)
Random Posts
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Dumble Overdrive Special: 1 Head & Circuit
An introduction to the Dumble Overdrive Special build, why the original amplifiers are legendary, and what makes the project worth chasing.
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High Gain SLO/Ubershall: 1 Intro
An overview of the main high-gain amplifier platform: a heavily modified SLO/Ubershall-inspired build with a long list of switchable ideas.
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Amiga Next-Gen Build: 2 Motherboard repair & power supply
The second Amiga Next-Gen Build entry chases heat-related instability through motherboard repair and power-supply suspicion.
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Guitar Pedals: 3 Fixing a Temu digital delay
A cheap Temu digital delay arrived broken, so this post follows the attempt to diagnose and fix it anyway.
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Restomod Car: 1 Engine
The Restomod Car series starts with the engine and the realities of reviving a long-stored 1996 Opel Astra project.
Homelab: 2 Tiny 24 Core virtualization Computation with hacked hardware
For some time, a good way to get cheap and powerful computers, outside of cutting-edge gaming or single-core heft, has been to get used server CPUs. There is even an interesting hardware-hacking community around this practice coming out of China, where chipsets are removed from old server computers and attached to brand new custom motherboards, allowing some delightfully unintended uses for server processors. You see, a lot of corporate computation often upgrade masses of computers at a time letting go of the leftovers for quite silly money, for instance what I use here cost when new $2.949 (and there is two of them so double this price), now 8years later, you can buy them for $80 or less each… This is a crazy world.
Well, after letting that sink in a bit, it is possible to run a machine such as this, with 24cores 48threads, at 2.5Ghz base 3.5Ghz boost using a hardware hacked motherboard, in a case not much larger than your regular shoe-box. Simplified, that’s about the power of 6 individual laptops of today 2021, perfect for virtual servers and machine-learning, any computation that can be parallelized and does not work on GPU’s. As far as the case go, it had ventilation with far to few openings so required some cutting and installing fan grilles, as well as reorienting flow and adding a fan to the bottom, making a 20C change.
This incredible thing here is in a sub Micro-ATX formfactor, containing the same sockets that usually require a massive server motherboard, hacked together from new and scrounged parts. Sometimes the most fun engineering are not found in cutting edge things.
Homelab: 4 Family & apartment friendly server cabinet
Homelab: 3 Turning laptops into mini-servers
Homelab: 1 25 Year old computer as a firewall: 60Mbps throughput
Continue in this series
More in Homelab & Compute