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Charles van Den

I create electronic projects, sometimes useful but most of the times not, with microcontrollers + tubes

Den Haag, the Netherlands

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This user joined on 09/11/2017.

My Projects

No-Si clock, with digital readout 0:00-11:59 TOTALLY WITHOUT SILICON. No microcontrollers, no chips, no transistors. Valves/tubes!

No-Silicon digital clock

charles-van-den Charles van Den

I created my own custom keypad by grabbing the hacksaw and literally cutting the QWERTY off an old PS2 keyboard.

Saw your keyboard!

charles-van-den Charles van Den

My Pages

Audel's handy book and some weird 21 segment displays therein
09/01/2025 at 20:55 • 2 comments

Some pages from Audel's handy book of practical electricity with wiring diagrams from the beginning of the 20th century.

And here is the animated gif that I made from Bett's clock monogram, just the numerals 0-9:

And here also with the alphabet:

Things I've Built

The Eadweard Muybridge VCR head project

In this project I combined Eadweard Muybridge's 19th century horse photographs with 20th century VCR technology and 21st century microcontroller technology to create a moving work of art.

Projects I Like & Follow

The 2016 Hackaday Prize

A digital clock built with Diode-Diode Logic (DDL), a quirky new logic family using only common diodes and passive components.

The Diode Clock

ted-yapo Ted Yapo

The digital clock need not to have the square form - this one is bent like a pancake.

In memory of Dali

voja-antonic Voja Antonic

Back To The Future Time Circuit Clock with clock, alarm and FM radio receiver.

Back To The Future Time Circuit Clock

atheros Atheros

2021 Hackaday Prize

Large WS2812 LED cylindric display project (1600 LEDs)

LED matrix cylinder gaming display

Keychain USB multiple password manager/generator/injector

Key Pass

An AVR Programmer based on USBasp which uses a ZIF-Socket for Programming.

AVR-ZIF Programmer

An alarm clock that encourages tinkering and modification. Targeted for kids, but fun for old hacks like myself.

Hack-Ready Alarm Clock

Only a few AVR Microcontrollers comes with an on-chip temperature sensor. But they have a temperature sensetiv RC and Watchdog Oscillator.

AVR temperature measurement without a sensor

thomas-baum Thomas Baum

Official Hackaday Prize Entry

An experiment in group machine intellegence (Or lack thereof...)

The Emergence Project

A rethink of the number of segments required to display a digit

6 segments suffice

ken-yap Ken Yap

A clock that uses Abacus logic to display the current time.

Abacus Clock

steven-roch Steven Roch

Using an Arduino UNO a 20x4 LCD display and an analogue skeleton movement to make a portable master clock.

LCD and Analogue Skeleton Clock

brettoliver brett.oliver

Augmented Reality Sharky Glass Break

Augmented Reality Sharky Glass Break

edgaras-art Edgaras Art

An AVR Programmer based on ArduinoISP

AVR Programmer

land-boardscom land-boards.com

Putting old MM5371 clock chips to use

Ancient PMOS technology clock

ken-yap Ken Yap

A simple demo for writing a Windows App.

Music Stuio Player

jim-patchell Jim Patchell

6 segments, multiplexed, cascadable to 6 digits

6 segment 2 digit LED display board

ken-yap Ken Yap

A 20 character retro-display word clock in 5 minute increments

Five minute clock

View all

Bits

Charles van Den wrote 08/31/2025 at 19:19

I just can't get enough! Also check out the 21 segment display from 1924 in https://archive.org/details/audelshandybooko00grah/page/n673/mode/2up

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Ken Yap wrote 08/31/2025 at 10:53

Thanks for your interest in #Ancient PMOS technology clock #6 segments suffice and #6 segment 2 digit LED display board I couldn't resist one more tweak to the 6 segment font to fill the gap in segments C and F and constant current drive is needed. Stay tuned.

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