[spectre] 808-Kick Drum Module - Workshop, Berlin 23Aug
post at wolfgang-spahn.de
Sun Aug 10 23:06:16 CEST 2014
Paper-Synthesizer 808KD - Kick Drum Module
Functional Clone of Tr-808 Bass Drum
Workshop by Antti Pussinen and Wolfgang Spahn
The sound of 808 bass drum is one of the most recognizable electronic
instruments. It is The sound of 80´s hip hop and electro and one of the
most cloned and copied electronic musical circuits of all time. A number
of Masters and Phd works have been built around the clever functionality
of this particular circuit and it is a good starting point in learning
analog percussive sound synthesis.
In the workshop we build a functional clone of the circuit, using
contemporary replacements for op-amps and transistors. in the module are
controls for Accent, Decay, Tone and Level, like in the original. it has
a trigger input and a sound output with a jack connector and possibility
to use external accent input. All the known modification points are
marked in the paperboard.
The original circuit expects two different triggers, the actual trigger
and the accent trigger, to arrive exactly at the same time and to be 1
ms long.To allow triggering with a button, we have to add in a small
conditioning circuit. This makes it possible to also trigger the bass
drum with another sound that has a strong and fast transient, for
example hi-hat sound. it also can be triggered with any cmos style
triggers, for example with an arduino.
The circuit consists of trigger input conditioning, bridged-t type
oscillator with a separate filter circuit for decay control of the
sound, passive lo-pass filter, and a swing type voltage controlled
When a short electric pulse is fed in to the circuit, it transfers that
pulse into a sound. The circuit is full of cool and elegant design
tricks. For example the voltage of the trigger pulse, called accent in
the original TR-808, changes all the parameters of the sound to make the
sound feel like more loud or accented, thus making variable dynamics in
the drumming possible.
The building system is based on working methods of both of the artists,
in field of sound and visual art. The Basic building block is the
stripboard/prototyping board and the circuit is laid on top of that as a
printed paper sheet. One then assembles all the components per printed
circuit design. In the era of copy-paste also synthesizer circuits can
be produced in large numbers with a help of a printer and easily
All the tools and materials will be provided.
The workshop will be held in German and English.
August 23 2014, 11am - 5pm
Mülhauserstr. 6. Hofgebäude 1. OG, 10405 Berlin
Costs: 30,00€ plus 20,00€ for the materials.
Registration: post at wolfgang-spahn.de
____________kastanienalle 85_________10435 berlin
__Atelier:__gerichtstrasse 12-13_____13347 berlin
__030 39200060______________________ 0179 7935447
More information about the SPECTRE