Hackaday.io Hackaday.io
Projects
Discover Contests Courses Stack
More
Courses Tutorials Events Hackerspaces Hackaday.com Tindie Marketplace
Sign up Log in
Close
0%
0%

Keri Szafir

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

Gdańsk, PL
Following Follow me
Send a private message
Similar accounts worth following
24 Followers
69 Following
19 Projects
  • Projects 19
    • View All
  • Contributions 1
    • View All
  • Hackerspaces 1
    • View All
  • Pages 6
    • View All
  • Following 168
    • View All
  • Bits 14
keri-szafir
Send a private message

Who I Am

I've been building electronics for most of my life... Vacuum tube amps (guitar & hi-fi), vintage gear restorations, audio stuff, test gear, automation, fun projects etc. both for myself and for an occassional customer. I own and run Keritech Electronics - my little lab in the center of Gdańsk, Poland, where I live and work. I'm also a mechanic who knows a thing or two on operating and maintaining Monotype typecasting machines. Open to collaborations.

Why I'm on Hackaday.io

For getting out of my tiny lab to the broader world! Your regular mad scientist's plot to conquer the world.

electronics audio Vacuum tube studio gear amplifiers raspberry pi arduino home automation electrical engineering python C gnu/linux
  • Twitter
  • GitHub
  • Youtube
  • Patreon

This user joined on 12/21/2021.

Proud member of

Hackerspace Pomorze

My Projects

6.6k
668
0
16
Equipment power remote control, networked audio interface and a NAS for the digital music collection
Project Owner Contributor

Keritech AC-1 Audio Computer

keri-szafirKeri Szafir

8.3k
29
5
22
A single-ended tube stereo amplifier with a modern technology twist
Project Owner Contributor

Keritech "Little Red Devil" Single-Ended EL84 Amp

keri-szafirKeri Szafir

1.3k
6
2
6
An automatic vacuum tube tester built around the AVT5229 board
Project Owner Contributor

Keritech P-5229/1 vacuum tube tester

keri-szafirKeri Szafir

1.7k
8
9
13
Recombobulating a 1970s vintage digital electronic calculator from Eastern Germany
Project Owner Contributor

Soemtron ETR220 Restoration Project

keri-szafirKeri Szafir

1.1k
10
0
10
Adding a WiFi, NTP and MQTT remote control & measurement unit to a storage heater.
Project Owner Contributor

IoT Storage Water Heater Control

keri-szafirKeri Szafir

250
8
1
10
Combining a Nixie milivoltmeter and an arbitrary number of manually switched LM35 temperature sensors.
Project Owner Contributor

ThermoNIX Multi-Channel Thermometer

keri-szafirKeri Szafir

View all 19 projects

Projects I Contribute To

365
362
0
15
Play Music ? Like Music? Hack Music? Lets hangout and chat!
Project Owner Contributor

Music Chat!

avrAVR

My Hackerspaces

80
0
0
A space for hanging out, playing, discussing, working together and doing projects. Open days on Thursdays 18:00 local time!
Project Owner Contributor

Hackerspace Pomorze

keri-szafirKeri 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

147.1k
388
27
225
A journey into re-purposing old laptop screens
Project Owner Contributor

LVDS Laptop Display Interfacing

jared-sansonJared Sanson

122.9k
1,616.8k
75
2.5k
Follow for the 'Hacklet' and latest news about hackaday.io
Project Owner Contributor

Hackaday.io Project

lutetiumLutetium

  • Hackaday Prize 2019
97k
4k
53
368
Portable Power Platform for Pi Zero
Project Owner Contributor

PiSugar Battery for Raspberry Pi zero

jdaieJdaie

  • The 2017 Hackaday Prize
83k
597
42
183
The only thing worth doing, is the thing worth doing right!
Project Owner Contributor

DAV5 V3.01 Raman Spectrometer

david-h-haffner-srDavid H Haffner Sr

  • The 2015 Hackaday Prize
58.4k
441
1
37
DIY Hifi Phono Stage
Project Owner Contributor

Muffsy Phono Preamp PP-3

skrodahlskrodahl

  • 2021 Hackaday Prize
54.1k
5.2k
24
280
A physical switch for my computer to choose between Linux and Windows
Project Owner Contributor

Hardware boot selection switch

stephen-holdawayStephen Holdaway

  • The 2017 Hackaday Prize
39.4k
3.1k
11
204
Quickly identify radioactive materials with a pocket-sized ion chamber. Built from standard parts for easy manufacture and low cost.
Project Owner Contributor

Open Radiation Detector

carlos-garcia-sauraCarlos Garcia Saura

  • Hackaday Prize 2019
35.5k
7.7k
30
194
An Off-the-grid messaging system.
Project Owner Contributor

Skrypt

taiwoTaiwo

31.8k
183
38
140
A mc68k-based computer motherboard, some expansion cards, and a very basic multitasking OS, all built from scratch.
Project Owner Contributor

Motorola 68000 computer

stuartStuart

28.6k
124
5
70
A fully featured tape emulator for the C64 that loads TAP files from an SD Card and allows the user to interact via an LCD and button panel.
Project Owner Contributor

Tapuino, the $20 C64 Tape Emulator

peter-edwardsPeter Edwards

27.2k
207
38
236
cordwood + smt + jewelry + blinkies + zinc-air batteries
Project Owner Contributor

cyborg ring

zakqwyzakqwy

  • The 2016 Hackaday Prize
26k
82
10
80
a 16-bits YASEP computer (mostly) made of DIP/SOIC chips like in the 70s and 80s... with 2010's twists!
Project Owner Contributor

Discrete YASEP

yann-guidon-ygdesYann Guidon / YGDES

25.4k
90
15
48
Embedd an esp8266 embedded inside the roomba for web based control and statistics
Project Owner Contributor

ESP8266 controlled Roomba

fredrik-markstrmFredrik Markström

23.9k
50
18
42
A tiny low voltage tube guitar amp!
Project Owner Contributor

The Milli-Amp

kris-slykaKris Slyka

  • The 2018 Hackaday Prize
23.8k
88
22
111
Von-Neumann 16-bit relay computer with Brainfuck++ instruction set
Project Owner Contributor

BrainfuckPC Relay Computer

artem-kashkanovArtem Kashkanov

21.3k
1.8k
13
33
Hacking a digital audio output (i2s and/or optical) onto an Amazon Echo Dot V2
Project Owner Contributor

Hi-Fi Digital Audio from the Echo Dot

mattMatt

19.6k
24
12
32
15.7KHz composite sync generator for old arcade monitors and SCART TVs enhanced following visenri's indications
Project Owner Contributor

The ultimate VGA to SCART adapter

scart-vaderSCART VADER

19.4k
103
24
125
The PERSEUS-8 is the enhanced version of the minimum configuration type the PERSEUS-7 6502 computer
Project Owner Contributor

PERSEUS-8 homemade 6502 computer

mitsuru-yamadaMitsuru Yamada

View all

Share this profile

Share

Bits

Log In/Sign up to comment

Become a Hackaday.io Member

Create an account to leave a comment. Already have an account? Log In.

Sign up with Github
Sign up with X OR
Mitsuru Yamada wrote 07/02/2026 at 01:12 • point

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.

  Are you sure? yes | no

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

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.

  Are you sure? yes | no

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

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!

  Are you sure? yes | no

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

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.

  Are you sure? yes | no

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

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.

  Are you sure? yes | no

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

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.

  Are you sure? yes | no

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

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

  Are you sure? yes | no

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

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.

  Are you sure? yes | no

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

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.

  Are you sure? yes | no

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

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

  Are you sure? yes | no

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

Thanks for liking #6 segments suffice !

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

  Are you sure? yes | no

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

An AL4, old European side contact power pentode.

  Are you sure? yes | no

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

Wow, respect! Way older than me too.

  Are you sure? yes | no

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

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

  Are you sure? yes | no

Send a private message to Keri Szafir

Become cool instantly

Create your Hackaday.io profile like Keri Szafir and many others
Going up?

About Us Contact Hackaday.io Give Feedback Terms of Use Privacy Policy Hackaday API Cookie Management

© 2026 Hackaday

Report user as inappropriate

You are about to report the user "Keri Szafir", please tell us the reason.