Guide - Christian Liljedahl

Battery Voltage Measurement

Exploring ways to measure voltages in a battery bank. Using resistors or optocouplers.

DIY "Humbugger" balanced pickup

A really quick and dirty way to make a pickup in a pinch. A bolt, some wire and a super magnet. Attach to a xlr microphone cable and plug it

Guide, Fire

Making a pulsejet trombone

A bit of a guide to the shape and construction of the pulsejet trombones - What we did to make them ignite and burn reliably.

Light, Water, Guide

Underwater Lights

I have done underwater lights in many ways. Most fun was using oil filled jam jars and plastic bottles with 1000 W halogen tubes. My Instructable on Underwater Lights.

Guide, Electronics, Sound

Balanced Piezo Microphone

Using two piezo contact microphones sandwiched together makes for an easy noise free balanced contact microphone. I have explained this pretty well in this Instructable.

Light, Guide

Smd LED Flowers

Mounting smd LEDs sideways in laser cut acrylic made these pretty flowers possible. Made a full instructable of the whole process of this.

Fire, Guide

Gas + Air = Fire

Experiments with mixing air and propane using the venturi effect - like a bunsen burner. This little guide should show you one way to make it work.

Guide, Fire, Electronics

Arduino and Spark Plugs

This little guide will show you how to make a spark plug spark - and control it from an Arduino. Using a Mosfet or a dedicated spark plug drive IC.

Guide, Electronics, Water

Watertight cable junctions

Working with installations in and under water at illutron, we often need watertight cable connections. Commercial products exist for this - But they are very expensive - And can be

Guide

Simple Rotary Encoder

Using just a small dc-motor and a resistor to make a crude rotary encoder for the Arduino. I came up with a very simple way to make rotary encoders. I

Guide, Electronics

Arduino and Load Cells

I have been doing some experiments to get load cells working with Arduino. This is a collection of my experiences. Something about: * What is a load cell * How did I

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