Two transistor audio oscillator

Audio Oscillator 2-Transistors

A simple direct-coupled oscillator with two transistors. (August 3, 2009)
Category: circuits audio - Updated: 2009/08/02

Homemade Gramophone (Phonograph)

I'm ending the year listening old music from Vinyl disks, So I build my home-made gramophone using a pin and a plastic cup. With my lego set of "mindstorms" I was able to spin the disk at 33 RPM (approximately). Here are some photos an a video of my gramophone. (12/31/2006)
Category: lego projects science diy homemade audio howto - Updated: 2009/07/23
homemade hi fidelity speaker.

Hi-fidelity Homemade Loudspeaker.

From the Inventor of the Styrofoam Plate Speaker, here are the instructions to build the "Hi-Fidelity homemade styrofoam-plate speaker". (8/6/2007)
Category: hacks science projects diy homemade audio howto - Updated: 2014/03/02
home made speaker

How To Make a Speaker

A homemade speaker using a plastic cup, business card, wire, magnet and some Lego blocks. I built this speaker from scratch; I was surprised of the quality of the sound. Updated! (6/14/2007)
Category: diy homemade science projects audio - Updated: 2009/07/24
Simple Lie Detector.

Lie Detector

A simple and easy to make lie detector circuit. (August 3, 2009)
Category: circuits audio diy science - Updated: 2009/08/02

Mini Amplifier with LM386.

The LM386 is a low voltage audio power amplifier, simple and easy to build a mini amplifier with only a few components. (7/3/2006)
Category: electronics circuits homemade audio - Updated: 2009/07/23
NXT Record player

NTX Gramophone / Vinyl Record Player

This is my second version of my homemade Gramophone/Phonograph using my LEGO Mindstorms NTX. (2/11/2007)
Category: lego science projects homemade audio howto - Updated: 2014/03/02
Apple iPod frozen

Reset a frozen iPod.

It happens sometimes. With no apparently reason the iPod freezes and needs to be reset. Here is how to do that. (July 30, 2009)
Category: howto audio electronics - Updated: 2009/07/29
Sound Meter Schematic


A simple soundmeter using the PIC 16F628 or 16F84 (5/20/2006)
Category: microcontroller circuits audio - Updated: 2009/07/24



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