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Johan Carlsson

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6 Followers
32 Following
4 Projects
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johan-carlsson
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This user joined on 03/11/2017.

2.1k
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Software and hardware for storing 8-kHz, 8-bit (or less) audio on an AVR MCU, and playing it back
Project Owner Contributor

Storing and playing back lofi audio on an MCU

johan-carlssonJohan Carlsson

1.2k
5
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Exploring a couple of alternative uses for vacuum fluorescent displays (VFDs)
Project Owner Contributor

Vacuum fluorescent display (VFD) hacks

johan-carlssonJohan Carlsson

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Four IN-3 neon glow lamps powered by a 9 V battery, a Colpitts oscillator and a 7-stage Greinacher voltage multiplier
Project Owner Contributor

Neon glow lamp advent candelabrum

johan-carlssonJohan Carlsson

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My son and I did this 3-cell, 4-penny Volta pile for his 3rd grade Science Fair. His school is closed, so we're putting the project online.
Project Owner Contributor

Science-Fair Penny Volta Pile

johan-carlssonJohan Carlsson

126.2k
2.1k
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IP over 430MHz Ham Radio, 50 to 500kbps, 20W RF. Extension for HSMM-Hamnet-AREDN. 100% open-source.
Project Owner Contributor

NPR New Packet Radio

f4hdkf4hdk

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A 3D printable, MEMs based microphone is proposed in this project. The microphone is laboratory grade, IEPE powered, and less than $30.
Project Owner Contributor

MEMs Based IEPE Powered Instrumentation Microphone

peter-riccardiPeter Riccardi

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Playing vacuum tube is not so difficult as expected. Let's play great heritage of human being by modern technology!
Project Owner Contributor

Vacuum tube game in 21st century

kodera2tkodera2t

14k
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Transmit radio signals using just a serial port? You bet!
Project Owner Contributor

Serial Port SDR

ted-yapoTed Yapo

8.8k
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A custom build of a valve amplifier using two 6AK5/EF95 valves, 4S battery pack with protection, charging module and battery level indicator
Project Owner Contributor

Battery Operated Hybrid EF95 Valve Amplifier

ratti3Ratti3

7.9k
27
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How an Attiny85 self-regulates its cheap power supply.
Project Owner Contributor

A Cheap And Dangerous Garden Light Boost Converter

randy-elwinRandy Elwin

7.8k
27
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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

7.3k
30
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How to make a very simple single tube amplifier that also works at low voltage and is powered by 12V DC.
Project Owner Contributor

DIY Simple PCL82 Low Voltage (12V) Tube Amplifier

mircemkmircemk

6.8k
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Building my first tube amplifier, on a tight budget.
Project Owner Contributor

Dirt Cheap Tube Guitar Amp Build

electroidiot_electroidiot

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We will use the E32 LoRa module. E32 is a 1 Watt LoRa high power module and we will also take a look at its breakout board.
Project Owner Contributor

E32-433T LoRa module Tutorial | DIY breakout board

akarshagarwal98akarshagarwal98

5.2k
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An interesting project that describes how to make several useful devices using a CFL bulb ballast, with minimal modification.
Project Owner Contributor

Induction Heater and HV source from CFL Bulb

mircemkmircemk

3.9k
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This projectdescribes the making of an unusual tweeter speaker that is much appreciated in the high-end audio class.
Project Owner Contributor

DIY Plasma Tweeter (speaker)

mircemkmircemk

3.6k
10
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Hacking the "I can solder" pin with a fancy steampunkish neon bulb lamp and a high voltage joule thief
Project Owner Contributor

I can hack – Pin

suedbunkersuedbunker

3.2k
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Musical instrument without batteries!, created with the motor of a PC CD player and a piano generated with the incredible 555
Project Owner Contributor

Acordeonador

bernaBerna

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Have a close look at how Electrical Discharge Machining (EDM) works and what can be achieved with a simple setup
Project Owner Contributor

Spark erosion: Detailed view, simple machinery

norbert-heinzNorbert Heinz

2.2k
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A home brew mini-synth idea using no transistors with the Patrick Oscillator
Project Owner Contributor

Transistorless Sound Synthesizer

dr-cockroachDr. Cockroach

2.1k
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Blueprints for network alternative navigation tools.
Project Owner Contributor

Aweigh

aweighaweigh

1.7k
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How to make a Geophone sensor yourself for free from parts that can be found in any workshop.
Project Owner Contributor

DIY Extremly Sensitive and cheap Geophone sensor

mircemkmircemk

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Peter Walsh wrote 10/25/2021 at 23:01 • point

I was just rummaging around on DigiKey for neon lamps, and was surprised that the one I chose had a lifetime of 1500 hours. Then I looked at another one and it had a lifetime of 20,000 hours.

Both of these are rather low - it's about 2.2 years of continuous use. This may explain why your hot test shortened the life of the bulb.

But more importantly, watch out for the short lifetime bulbs - this may make standard bulbs unsuitable for listening for girder failure. It might be OK for nuclear reactors when you can tolerate changing the bulb every year as part of maintenance.

It might also be possible to adjust the design for longer life, such as embedding the device in plastic.

  Are you sure? yes | no

Peter Walsh wrote 10/27/2021 at 03:46 • point

Thinking it through, I have a trivial fix for this. It's obvious, but IM me if you're interested.

  Are you sure? yes | no

Randy Elwin wrote 04/26/2019 at 16:12 • point

Thanks for following #A Cheap And Dangerous Garden Light Boost Converter !

  Are you sure? yes | no

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