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Keri Szafir

The vacuum tube witch and a vintage electronics nerd doing projects on a budget tighter than Ethel Granger's laces.

Gdańsk, PL

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This user joined on 12/21/2021.

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Hackerspace Pomorze

My Projects

Equipment power remote control, networked audio interface and a NAS for the digital music collection

Keritech AC-1 Audio Computer

keri-szafir Keri Szafir

A single-ended tube stereo amplifier with a modern technology twist

Keritech "Little Red Devil" Single-Ended EL84 Amp

keri-szafir Keri Szafir

An automatic vacuum tube tester built around the AVT5229 board

Keritech P-5229/1 vacuum tube tester

keri-szafir Keri Szafir

Recombobulating a 1970s vintage digital electronic calculator from Eastern Germany

Soemtron ETR220 Restoration Project

keri-szafir Keri Szafir

Adding a WiFi, NTP and MQTT remote control & measurement unit to a storage heater.

IoT Storage Water Heater Control

keri-szafir Keri Szafir

Combining a Nixie milivoltmeter and an arbitrary number of manually switched LM35 temperature sensors.

ThermoNIX Multi-Channel Thermometer

keri-szafir Keri Szafir

View all 19 projects

Projects I Contribute To

Play Music ? Like Music? Hack Music? Lets hangout and chat!

Music Chat!

My Hackerspaces

A space for hanging out, playing, discussing, working together and doing projects. Open days on Thursdays 18:00 local time!

Hackerspace Pomorze

keri-szafir Keri Szafir

My Pages

Vintage Polish Vacuum Tube Catalogs
05/31/2024 at 19:01 • 0 comments

Recent acquisitions in the lab: vacuum tube catalogs by Piotr Mikołajczyk, in addition to the two I already had by Leon Niemcewicz, with vast amounts of vacuum tube data. I love vintage printed catalogs, can't get enough. Enjoy!
Channel 2nd Anniversary Special
12/18/2023 at 20:30 • 0 comments
Keritech Electronics Lab Tour!
04/19/2023 at 23:04 • 0 comments

View all 6 pages

Projects I Like & Follow

Supplyframe DesignLab: 2023 Hackada…

A different approach for a solar tracker, alternative movements, to be installed on the outside, to optimize the efficiency of solar panels

mysoltrk - a solar tracker, reinvented

my-solar-tracker My Solar Tracker

This is a 1/60 scale model of the Saturn V and Launcher - Umbilical Tower. This model is huge! I have been working on it for two years.

Apollo Saturn V and LUT

This is the oldest PCB in my collection, acquired from a scrap sale at an old NASA test stand. What did it do?

Reverse Engineering an Apollo-Era Circuit Card

A smart cat bowl that uses facial recognition

Cat Bowl Monitor

New developments in planetary position calculation applications and external PROM modules for PERSEUS-9.

PERSEUS-9 2023 Update

mitsuru-yamada Mitsuru Yamada

3D Printed Selectric Typeballs

sam-ettinger Sam Ettinger

My not so fancy example of Magnetic Core Memory using fairly cheap cores and free parts from my junk box.

Magnetic Core Memory The Dr Cockroach Way

dr-cockroach Dr. Cockroach

This is a tube amp build using only the 5V supply of a USB connector.

Battery tube amp using only 5V USB power

A vacuum tube computer without semiconductors, 4-bit Von Neumann, 4096 words core memory, graphics output

GLASNOST Vacuum Tube Computer

paul-kocyla Paul Kocyla

Intel 4004 single board computer running calculator program, VTL interpreter, 8080 emulator, and so on

Intel 4004 Homebrew Computer

ryo-mukai Ryo Mukai

This article presents an actual operation and internal circuitry of my own Digital Sampler in 1979.

Homebrew Digital Sampler in 1979

mitsuru-yamada Mitsuru Yamada

Just doing some restoration on vintage synthesizers

Synth Restoration

An 8 line by 3 trunk telephone exchange

Mockingbird Telephone Exchange

I build a model railway controller using analog PWM & block detection with manual and automatic control, and I evaluated the passing siding.

Model Railway Controller using Analog PWM

mitsuru-yamada Mitsuru Yamada

My long journey to understanding the architecture and fixing what ended up being a trivial resistor failure.

Fixing a Fluke 412b High Voltage Supply

collin-matthews Collin Matthews

My entry to the 2024 business card contest, a big-muff guitar pedal in a business card form factor !

Party in the front, business in the back

chloe-chateau Chloe CHATEAU

Utilizing a low cost electrophoresis high voltage supply and DMMs to test a rare Powertube for use in Fluke regulated power supplies.

Simple Vacuum Tube Tester

collin-matthews Collin Matthews

An Arduino compatible board for Polish Makers

Polduino UNO

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Bits

Mitsuru Yamada wrote 07/02/2026 at 01:12

Thank you for liking and following my #Model Railway Controller using Analog PWM! I think I've managed to recreate the feel of some kind of control panel from decades ago.

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Mitsuru Yamada wrote 07/01/2024 at 10:49

Thank you for liking and following my #Homebrew Digital Sampler in 1979! I remember myself back then, seeing the light dots on the analog oscilloscope screen dancing for the first time in over 40 years.

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Keri Szafir wrote 07/01/2024 at 12:02

That's a lovely project - especially for 1979! That was pretty advanced back then. I'm impressed, and I admire your build quality. Spare no expense!

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Mitsuru Yamada wrote 08/16/2023 at 23:32

Thank you for liking and following my #PERSEUS-9 2023 Update! I was able to find and fix bugs in my own floating-point interpreter by running a somewhat complicated calculation program such as astronomical calculations.

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Mitsuru Yamada wrote 03/20/2023 at 01:48

Thank you for liking and following my #Homemade Floating Point Interpreter for 6502! I recently uploaded a YouTube video of me updating the PROMs of this interpreter with my own PROM programmer. And I added a link to this video to the project.

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Mitsuru Yamada wrote 12/07/2022 at 00:17

Thank you for liking my #Prehistory of my homemade PERSEUS computers ! It was more than 40 years ago, but I have the feeling that I was quite formed in the way I am today.

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Keri Szafir wrote 12/07/2022 at 02:53

I love your Perseus computer project, and what comes with it! Beautifully made - and much appreciated.

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Mitsuru Yamada wrote 12/07/2022 at 14:21

Thank you for liking my several projects ! I make sure that my own creations have a solid housing and design to keep them in practical operation for even 10 years or more.

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Keri Szafir wrote 12/07/2022 at 15:42

That's a sign of good engineering! I'm inspired by the Cold War era electronic design, try to re-create some of that in the devices I build, using vintage components.

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Ken Yap wrote 12/06/2022 at 15:00

Thanks for liking #Restoring a Beckman neon display clock I admire its digits everyday.

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Ken Yap wrote 12/06/2022 at 04:08

Thanks for liking #6 segments suffice !

Wow, that's a really old tube you're holding. Octal base or even older?

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Keri Szafir wrote 12/06/2022 at 09:30

An AL4, old European side contact power pentode.

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Ken Yap wrote 12/06/2022 at 09:38

Wow, respect! Way older than me too.

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Keri Szafir wrote 12/06/2022 at 14:16

This one wasn't that old - 1960s or so, but the type dates back to pre-WWII times.

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