Make MonoBox - Trash speaker

Many mix engineers will cross reference a mix through an alternative set of speakers. The concept is that no one out in the real world has a set of studio monitors. This is part of the reason that NS10s and Aurotones are such sought after speakers.

Make magazine has published a small amplifier circuit based on the LM386 op-amp, which is well suited to use in small form powered speakers. Unbalanced line level feeds the amplifier, which is powered by a 9V wall adapter.

 Internal Layout

 Rear Panel

 Veroboard Layout

Schematic
R1 is 10K for line level source. Change to 100R for headphone level source. If using a wall adapter, remember to filter your psu with a 100uF electro cap.

Heterodyne Space Explorer

A circuit from Beavis Audio (website now defunct).
This is a CMOS multi-waveform noise tone generator which can be used for droning experimental sounds.

The chip is capable of six simultaneous waveforms, but I only used four for this project. Veroboard layout:

Remember to filter your power if using a wall adapter.

Noisy Cricket Amplifier

The Noisy Cricket amplifier from Beavis Audio is one of my favorite circuits, but I always think small form amps like this are never really taken seriously.

I decided to do some serious over-engineering to present this 1/2 watt amplifier in a large amp format.

Original schematic from Beavis Audio (website now defunct)

I re-designed the circuit layout for turret-board; this has no impact on the sound of the amp, but it sure looks cool.

I think the amplifier looks a lot better in this form, than the tiny project box. It pairs well with my fuzz speaker.

Here is the original Beavis Audio board layout.

Tailed Bridge Guitar

Tailed bridge guitar, based on Yuri Landman's strat eraser project. Fender Jazzmaster body design.

Tail tuned to 5th harmonic of the neck, with pickup behind the bridge.This makes massive resonance on some frets.

Output using switched sockets can be:

1 - Guitar only (mono)

2 - Guitar and Tail (mono)

1+2 - Guitar and Tail (stereo). Plug into two amplifiers.

Artwork for pickguard (stolen from) artist and musician Jad Fair