Friend brought his turntable not working.. It was old Omnitronic DD-2250 poor thing, no reasonable spare parts available, of course..🎉 Problem was broken wire of primary coil in mains transformer..♻🆗🚮
So i replaced the old double secondary transformer with single secondary toroidal one(~10€), plus DC-DC supply with LM2596(<2€).. 🆒
The switching-mode power supply is adjusted @ 15V DC and connected just where the original AC wires were plugged, counting with voltage drops on rectifying diodes and stabilizer LM7812.. Reason was to modify as little as possible to keep things simple..
I was shocked by tremendous 400mA current when i stopped the motor with two fingers..😂😂😂😂😂🤣
Normal spinning took only 80mA, its so greeeeenNNN!!!✅♿ 🤣
(measures were done DC powered @ 29.5V and 15V)
Update: Its still working after half of year..💪🎶🔊

Hello there!

KiLLA’s got some new stuff to share 😉

I have plans to use most of these ICs @ 12MHz SPI so i made proper shield instead of breadboard because some guy found it too noisy to work properly that way(link at bottom).
The shield is drilled a bit off axis as i did make it fast with 550W handheld drill 😛

First tests with built in libraries reach sort of low speeds, probably due to latency growing with bus speed, getting ~20kB/s with byte transfer for both writing and reading @ 12MHz and ~50kB/s for 4MHz SPI 🙄

SRAM ICs:
23LCV512-I/P 64kx8bit SRAM 20MHz SPI – TESTED WORKING up to 12MHz
IP12B256I-TU 32kx8bit SRAM 20MHz SPI
IP12B512C-TU 64kx8bit SRAM 20MHz SPI

todo:
# do some more tests..speed!!!
# find fastest library or make own, this guy juiced off ~120kB/s

usefull info:

the noisy guy:
https://dave.cheney.net/2014/01/25/avr11-building-an-spi-sram-shield-for-an-arduino-mega

microchip 23xx spi pinout:

Simplest SRAM library i found:
https://github.com/panStamp/sram

SRAM library:
https://github.com/SV-Zanshin/MicrochipSRAM/blob/master/MicrochipSRAM.cpp

This library example compiles, but throws errors on serial monitor running on Arduino:
https://github.com/MattairTech/SRAM_23LC

Well, this is still under development as i found that even example is weird, because it refuses to read properly whatever RS232 except for bytes sent by the sketch for me.. https://www.arduino.cc/en/Tutorial/ArduinoSoftwareRS232

..managed to correct it, but its weird somehow..

Yeah..

I was quite sure that this wont work, but we have been forced to try.. Not that much.. 😛
Normally the LAN is got over FTP and UTP cables, aka the twisted ones.. Yeah, the twisted wires.. Or even twisted pairs of twisted wires.. Cat6e has 6 twists per inch..
But using old 12 x 1.5mm² AC mains cable with no twists which is 20 to 30 meters long, is under ground and dated to late 70’s or 80’s must fail..or..?

why this could work?
1st: i used only 10Mb/s mode
2nd: we were totally lucky

update 2/2017: i will be finishing this project soon!

Last month i have been asked to code program to my work..
It took huge amounts of time.. but.. it was fun to hack Windoze 😀

what does it do:

• after starting Win7 and login to username the desktop is not showed & our IS is started and held fullscreen
• checks for our IS running, if its shutdown by user our app asks for pass or restarts it
• hotkey to invoke our login / logout to system with timeout of 10min to login again
• while user is logged in an unmovable & switchable window shows rest of time until next login window appears
• checks for instances of web browsers (IE, Opera, Chrome, Mozilla) and asks for pass to our login or quits them
• checks for instances of autoruns etc. and kills them so absolutely no way computer can be penetrated from local user
• switching keyboard language via hotkey or automated because our IS needs EN keyset
• is able to disable itself while certain user is logged in Win7 and enable again at logout
• verbose logging to both local and remote files over network
• ability to control TeamViewer QuickSupport executable and send its login over network  (dropped due to uncommon / unknown licensing until it gets clear)
• overlay debugging window via hotkey

recent version 1.7.1.0 source code has size of ~30kB