Update thing out there
A place to catalogue analogue drum experiments, clonings, mods, hacks, bends, MIDIbox integration, specialised drum sequencers, MBSEQ firmware, SID as drum machine, triggering, E-Drum heads etc etc etc.
MIDIBox SEQ v2 - a simple control surface can be built with 16 LEDs/switches and one encoder (according to the SEQ Drum Mode tutorial below), and still have full access to this amazing sequencer engine. Up to 48 seperate MIDI drum note assignments x 16 steps.
With added code, a LED matrix to display all drum patterns simultanously may also be possible, as in the Simmons SDS6. Moxi has already implemented a 4×16 button/LED matrix, and TK has indicated up 1024 may be possible (in MIOS, not necessarily in the SEQ). 4x16 LED matrix wiring - PDF. Also see the Sparkfun parts listed below.
MIDIO128 - up to 128 on/off signals and 128 input switches from one core. Useful for a simple fixed velocity MIDI to trigger/gate converter, sequenced from other equipment or software. A user adaption has added a DOUTx4 module for another 32 fixed velocity trigger outs.
MIDIBox CV - 8 gates and 2 analog CVs per AOUT module. Could be adapted for velocity triggers?
TR Sequencer - Discussion on the classic Roland TR-x0x drum sequencer user interface
DSEQ32 - mess's 32 step 8 track drum sequencer
MIOS Downloads - Code examples for:
* 8 CV outputs with the MBHP_AOUT module
* button matrix of 8×8 = 64
* 64 CV INs and OUTs
* 64 pots, 128 buttons, 128 LEDs
* velocity buttons (e.g. for drumpads)
* MIDIBox SID - steal matrix code
* MIDIBox SEQ
MIDIBox SEQ Drum Mode
MIDIBoxSID as drum machine - sounds like this!
Analog drum modules - cloning and triggering them - the thread that started it all
Moogah's 808/909 clone
Beginner's 16 step SEQ project
Alternative sequencer firmware
MB SEQ with button matrix?
SEQ with 4x16 buttons and LEDs
16x16 button matrix
4x16 LED/button matrix
using scan matrix together with led matrix? - Success!
MB-SEQ LED-Matrix in Firmware aktivieren - auf Deutch or in Google English
Diode matrix input - large matrix with MIDIO128
80 LEDs from one CORE
V-Trig, S-Trig and Gate - from Wikipedia
Gates and Triggers, Mystery Solved - from synthesizers.com
PIC MIDI programming - getting started
VC LFO and ADSR on PIC 16s - cloning analogue LFO and ADSR with PICs.
Drum pads and EDrums
TR-707 - Service manual, schematics, mods: you'll need to join to access files.
Drummachine - moderator approval to join
Roland Drum Machines
Simmons_Drums - schematics and service manuals galore
Circuit Bending - just a list of search results
Sparkfun Electronics have an 8x8 RGB LED Matrix with an SPI serial controller attached for $59.95. Red/Green version $34.95, matrix only small $4.95 large $29.95.
The serial controller backpack contains a reprogrammable AVR ATMega8 microcontroller, which bumps up the value equation and opens a world of possibilities, such as LED sensors.
4×4 lighted key matrix
High power shift register
Shift register 8 bit high power - serial in, 8 pins out at up to 50V/150mA each. $1.95. Sparkfun again :) This would be handy for triggering modules that expect more than +5V as from a DOUT.
S-Trig to V-Trig converter - also see below. 505/707 internal triggers are S-Trig.
V-Trig to S-Trig converter - different one below
Simple switch/trigger with transistors - ground switch with NPN or +ve pulse with PNP. The example given uses a PC parallel port and the BendControl Win95 sequencer
Arista Drum machine
SynthOllie's scans - Boss PC-2 Percussion with noise generator mod, Boss handclap, Casio VL-1, clap, synbal, synclap, syntom II.
Matrixsynth blog entry - where I got the link to synthollie and also a SynTom II and Cymbal II Zip file.
Papareil Synth Labs - Coron Drum Synth clone schematics, also lots of other FX and synth modules, MIDI projects, etc.
Roland TR-505 8x trigger out mod
R80 - Kick R75 - Snare R2 - Clap/Rim R69 - Cowbell R68 - Conga R63 - Hats R62 - Ride/Crash R60 - Toms
S-Trig to V-Trig converter
This will produce a voltage trigger in response to an s-trigger out. The trigger Off voltage will be 0 or 9 volts. ___o ___________ Close the switch to use, open / | 9-volt | it to save the battery life. |-----o o---- +| battery |-- ground ________________| On |___________| \ \ / / 10k \ 10k \ / / | |----------------------- to tip of jack | | sleeve to ground | 100k / ___________|___/\/\/\___|/ | |\ 2N3904 or equivalent 1 -|- S-trigger \ _____ in | 2 | | | --- | ground - --- ground
V-Trig to S-Trig (another)
The circuit that I have is very simple. One VMOS FET (something like the VN10KM). No power, nothing... it's something like: S|-----------------o S-Trig --- G | | trig o---------| | |___| V-Trig. | D | gnd o------------------------------o gnd where G, S, and D stand for Gate, Source and Drain - and I may have them mixed up, coz I'm doing this from a bad memory)
* MBFM drums (duh)
* 505/707 as trigger source
* LED matrix