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- Back to Work! IBM Wheelwriter Restoration, part 3
Finishing the Wheelwriter repair and restoration process.
0:00 Intro1:20 Ribbon Cassette Mechanism Fix12:20 Keyboard Recombobulation22:30 Testing23:50 Cover Reassembly25:12 Scale Fix34:40 Printer Option Reassembly37:20 F1 in Paper - On-Hand Quick Instructions39:45 Mains Switch Oops!42:15 Soundproofing Cover Fix45:00 Printer Setup and Testing49:30 Printing!53:25 Reattaching the Soundproofing Cover55:30 Some Failed Experiments1:02:10 AfterwordPart 1: https://youtu.be/Y2plorrsppk
Part 2: https://youtu.be/gCRCN1h9jIoSupport me on my Patreon page at https://www.patreon.com/KeritechElectronics
...or via PayPal https://paypal.me/keritechInstagram - https://www.instagram.com/KeriSzafirHackaday - https://hackaday.io/keritech#electronicscreators #typewriter #keritechelectronics
0 min - Dumpster Find... USSR Computer Tech!
Look, Mum! Soviet Computer!
A look at tens of Soviet computer boards from the '60s/'70s found in a e-waste dumpster. All germanium diode & transistor logic, nicely hand-routed single layer boards, way looser than those in the Soemtron, easy to follow... with some interesting twists too.
The modules might come from early generation of the ES EVM "Ryad" a.k.a. "Unified Series" mainframe computers, based on reverse-engineered IBM System/360. It's worth noting that apart from components from all over the Eastern Bloc (e.g. GDR transistors and capacitors, Polish capacitors), Western capacitors and semiconductors are there too.
RFC @ChernobylFamily - any info on these?
0:00 Intro (With Koko!)
1:38 Box Of Boards!3:20 Germanium Transistors... What Am I Supposed To Do With These?3:50 Different Substrates, Different Components4:25 Unholy Alliance5:40 Germanium Diodes6:50 Toshiba?!8:56 Rust and Failure9:40 UFO! None of that UAP rubbish...10:30 Aftermarket Service Jobs11:15 We have an alien invasion!12:00 The Big Ones14:15 Miflex Cap (and greetings to @SkunkieDesignsElectronics )15:30 Impostor Syndrome In Tech16:40 Curvy Traces17:07 Botched Repair17:55 On SMT In Soviet Electronics19:20 Afterword (With Koko!)Support me on my Patreon page at https://www.patreon.com/KeritechElectronics or via PayPal https://paypal.me/keritech
Instagram - https://www.instagram.com/KeriSzafirHackaday - https://hackaday.io/keritech#ElectronicsCreators #Keritech #Electronics
0 min - Inside An Old Polish Cumulative Recorder, and Ethically Questionable Science
Yet another thing I got from a university clearance... This time, it's more sinister in nature, involving experimenting on living test subjects. Questionable ethics time! No unforeseen consequences though.
0:00 Intro
1:00 Skinner Boxes and the Cumulative Recorder4:18 Overview of the CR-26:26 Writing, Marker, Reset and Paper Advance Demonstration10:00 Paper Feed and Drive Mechanism11:10 Taking Off the Bottom Cover13:25 Back Panel14:15 Controls, Mains Wiring and Mechanism17:15 Pen Advance Driving Mechanism19:57 Solenoid & Escapement Mechanism21:37 Cleaning and Lubricating the Pen Drive Shaft33:30 Mechanism Reassembly37:30 Engineering Brilliance! Phone Dial Return Mechanism39:20 Fire It Up Again41:00 Semi-Automatic Testing18:45 Afterword... And More Ethically Questionable Scientific InstrumentsSupport me on my Patreon page at https://www.patreon.com/KeritechElectronics or via PayPal https://paypal.me/keritech
Instagram - https://www.instagram.com/KeriSzafirHackaday - https://hackaday.io/keritech#ElectronicsCreators #Keritech #Electronics
0 min - Inside a 1960s Medical Device - Unistom G-9
Teardown of an old Polish dental pantostat made by FAMED (Medical Apparatus Factory), which interestingly was located a few hundreds meters away from my old home. I saw the factory everytime I looked out the window.
The Unistom G-9 was made in the 1960s/70s, it was used for several types of dental procedures: electro-surgery (electrotomy and electro-coagulation), endoscopy, sample viewing, ionophoresis and dental pulp testing using Faradic current.
The device runs on two EL81 pentodes in parallel as a HF current generator for electro-surgery and a TG0,1/1,3 thyratron for generating current spikes at up to 10% duty cycle on the dental pulp test setting which uses Faradic currents.The 110V DC power supply on the terminal board on the side is used for ionophoresis, with the milliammeter for measuring the current.The voltmeter is used in pulp test to set the voltage low enough to be relatively comfortable to the patient, but high enough to be felt when inflammated tissue is stimulated.0:00 Intro
2:48 Unistom On The Outside5:45 Taking It Apart7:19 We're In!9:05 The Enclosure10:03 Function Switch11:12 The Knobs11:47 Pilot Light and Botched Fix14:56 The Schematic!15:56 Electro-Surgery HF Current Generator20:05 Voltages and Medical Safety Mini-Rant23:05 Endoscope Power and Lights24:25 Ionophoresis Explained28:40 Pulp Test Explained30:00 Make an Amplifier! Make an Amplifier! Yet Another Amplifier!30:55 ASMR Project Update31:35 GoodbyeSupport me on my Patreon page at https://www.patreon.com/KeritechElectronics or via PayPal https://paypal.me/keritech
Instagram - https://www.instagram.com/KeriSzafirHackaday - https://hackaday.io/keritech#ElectronicsCreators #Keritech #Electronics
0 min - The Cake Is A Lie! Keritech Electronics Channel 2nd Anniversary Special
We've been together for two years! I missed the date... again.
How did it start?
I was inspired by @ContraPoints and @PhilosophyTube to start a channel in the first place, with video-essay / social issues content. It took months before I made my first video though, and it went in a completely different direction: tech stuff. I've been doing electronics since I was a teenager, building and fixing amps and tube stuff for two decades now. I'm neither a businesswoman, a career person at all, or a professional Youtuber... just a nerdy autistic 37 year old Polish trans gal who makes a poor living out of designing, building and fixing electronics, because that's what I was doing for most of my life. It's been two years of making videos now. I'm sticking to my guns running a non-commercial channel, which is about sharing tech and building a community first and foremost, and also an anti-capitalist anarcho-transfeminist neurodivergent propaganda outlet, and a space for creativity.
The Keritech Electronics name predates the channel by a few months. I came up with it soon after I choose a new name for myself when I was transitioning in 2020. Nerdy as I am, I chose it after a character in some of my favorite pop-culture... Keri was a non-player character in Fallout 1. She co-ran Crimson Caravan in The Hub with her father Demetre; she looked punk as hell and had the attitude. My kind of gal.
0:00 Unusual Intro
1:00 Hunky Dory1:50 Not In It For The Money!3:00 Nagging for Subs and Patrons3:45 Early Beginnings4:22 Keri's Story of Discovering @FranLab ... Again!7:25 Channel Highlights Overview9:30 Little Red Devil Analytics10:45 Extrayoutubular Recommendation Algorithms11:10 Open Circuits Book Review Analytics13:17 ZX Spectrum +2 Analytics14:23 Keritech AC-1 Analytics15:06 Unistom G-9 Analytics16:13 Maya1010 Reverse Engineering Analytics16:58 LRD Story Video Analytics18:00 First Video Analytics19:33 @UsagiElectric Shoutout20:36 Fallout Story Analytics... and Pin-Up Girls!22:44 Queer/Transphobia on Youtube Mini-Rant23:44 Analog Meters Video Analytics24:40 The Biggest Tube I Ever Had! Tesla ZD1000F Transmitting Triode26:40 It's Keri... Again... At The Bench!26:57 Internal Construction of ZD1000F28:55 Testing Setup30:19 Fire To The Wire!30:55 Glowup31:20 Full Power32:30 Sopot Vintage Computer Meet Story (C64 Cameo Appearance!)35:38 Youtube Enshittification Rant38:55 Saying What Needs To Be Said!Support me on my Patreon page at https://www.patreon.com/KeritechElectronics or via PayPal https://paypal.me/keritech
Instagram - https://www.instagram.com/KeriSzafirHackaday - https://hackaday.io/keritech#ElectronicsCreators #Keritech #Electronics
0 min - Boss TE-2 Effect Pedal Latching Mod
An electronic latching mod for the Tera Echo TE-2 pedal. Look, mum - no microcontrollers! All it takes is just three transistors, a few diodes and some passive components, none of that newfangled Arduino stuff. It's just a RS trigger, a base building block of the old school digital electronics. Built with diode-transistor logic, as seen in the Soemtron!
0:00 Intro
1:33 How Others Did It2:05 How I Did It4:00 Pitfalls and Problem Solving4:50 At The Bench... Again!6:00 Control Demonstration7:30 Wiring8:00 Schematic9:10 Circuit Deep Dive14:30 Earlier Prototypes15:25 Old Schematic and Failed Experiments17:35 Redesign19:00 Factory Error, Problem Solved20:10 Reassembly22:00 Fully Reversible23:00 AfterwordSupport me on my Patreon page at https://www.patreon.com/KeritechElectronics or via PayPal https://paypal.me/keritech
Instagram - https://www.instagram.com/KeriSzafirHackaday - https://hackaday.io/keritech#ElectronicsCreators #Keritech #Electronics
0 min - Medical electronics teardown again! Grass Instruments SIU-4B
Where is the grass greener? In Philadelphia, or in Gdańsk?
@FranLab just posted a video of the Grass Instruments P511 amplifier - https://www.youtube.com/watch?v=St_wtPv85McThis reminded me of the little treasure I once got from a lab clearance at the Gdańsk Medical University (GUMed), also made by Grass Instruments, but older and almost totally tubular, save for detection diodes. I was going to make a video about it for a long time.It's the SIU-4B stimulus isolation unit. It was used either in electro-medicine or biologic research, and provides galvanic separation between waveform generator and the patient or test subject.
A beautifully built little device with a single vacuum tube Hartley oscillator driving a transformer used for galvanic separation between the equipment side and patient side. The high amplitude AC signal applied to the tube's plate modulates the radio frequency signal passing through the core-less HF transformer and then is demodulated, filtered and attenuated, optionally with phase inversion. Perfect simplicity, astonishing build quality! It's built on a 2.5mm (or .1" a.k.a. 100 mils - if you stick with Vader and Emperor Palpatine) thick glass-epoxy substrate normally used for making printed circuit boards, only this is not a PCB - it has no traces. It's a turretboard, not unlike those found in boutique tube guitar amps. A thing of beauty, a joy for ever. I'm keeping this loveliness as a museum piece for the future generations to see and be inspired by.
0:00 Intro
1:41 Touchyfeeliness2:15 Front Panel4:05 Taking It Apart4:45 Look At These Lovely Parts!7:13 Aftermarket Mod8:10 Schematic14:37 Enclosure15:10 Medical Electronics Commentary16:55 AfterwordSupport me on my Patreon page at https://www.patreon.com/KeritechElectronics or via PayPal https://paypal.me/keritech
Instagram - https://www.instagram.com/KeriSzafirHackaday - https://hackaday.io/keritech#ElectronicsCreators #Keritech #Electronics
#teardown #reverseengineering0 min - Radio Intro
Time for a new one!
Support me on my Patreon page at https://www.patreon.com/KeritechElectronics or via PayPal https://paypal.me/keritech
Instagram - https://www.instagram.com/KeriSzafirHackaday - https://hackaday.io/keritech#ElectronicsCreators #Keritech #Electronics
0 min - New Gear! A Look At A Fluke 179
That girl got a new toy, and it's a lot of joy! I bought a secondhand Fluke 179 and that's gonna be a huge leap compared to the cheap Uni-T 890D+.
0:00 Intro
0:45 Mailbag!3:10 First Tries4:09 Fluke Story5:22 Taking It Apart9:00 Attention To Detail10:00 Made In The USA!11:00 Recombobulation12:10 Multimeter Rant12:30 For All Ya Threaded Inset Afficionados14:30 Testing the Fluke17:50 Capacitance Tests Against UT890D+21:00 12000µF Electrolytic Cap Challenge22:55 AfterwordSupport me on my Patreon page at https://www.patreon.com/KeritechElectronics or via PayPal https://paypal.me/keritech
Instagram - https://www.instagram.com/KeriSzafirHackaday - https://hackaday.io/keritech#ElectronicsCreators #Keritech #Electronics
0 min - Vintage Industrial Rheostats (with Teardown!)
A box full of vintage German industrial grade high power wirewound potentiometers, a.k.a. rheostats. Different types, some of them dual-ganged, with different travel angle... and a teardown of a damaged one to see how it is built.
Support me on my Patreon page at https://www.patreon.com/KeritechElectronics or via PayPal https://paypal.me/keritech
Instagram - https://www.instagram.com/KeriSzafirHackaday - https://hackaday.io/keritech#ElectronicsCreators #Keritech #Electronics
0 min
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