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Audio Amplifiers

Vacuum Tube Amplifier

I built a vacuum tube amplifier based on the PCL86.
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Simple Solid State Tesla Coil

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Plasma Speaker Based on TL494

This article is about a plasma speaker using a flyback transformer and a driver circuit based on the the TL494 PWM ic.
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ZVS Circuit

My take on the famous ZVS circuit, built with IRFP260N power MOSFETs.
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Balancing Robot

I built a little self balancing robot a while back. The project never really left the prototype stage, though it worked to some extent.
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CO2 Monitor

I built a device for monitoring the CO2 concentration of indoor air. It may be used e.g. in the office to remind one when it is time to ventilate the room.
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Field Oriented Control of a Stepper Motor

Although stepper motors are primarily intended for positioning tasks without position feedback from an encoder, fitting them with an encoder gives new possibilities for controlling them. The field oriented control scheme described in this article allows for controlling the torque of stepper motors.
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Magnetic Levitation

A crude magnetic levitation experiment quickly thrown together on some weekend.
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H-Bridge Current Sensing

I intend to do some experiments with motor control and switching converters. Some of these experiments require to control currents in power electronic circuits, in particular the currents through inductive loads in H-bridge circuits. For that purpose, currents in H-bridges first have to be measured.
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IMU Sensor Fusion

In this article, the combination of accelerometer and gyroscope data for angle and angular velocity estimating via an observer is discussed.
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Pulse Induction Metal Detector

Several years ago, I built a metal detector based on the pulse induction principle.
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