4U 100 and 200 Series Modules

I own some 200 series format modules so I do builds and repairs for others.  I did build the 266 Source Of Uncertainty, Lopass Gate, and the Pulser, Cross Fader, and Timbre generator functions in 5U format modules for my system with modifications for MOTM-signal levels.  I also have my own 208 Music Easel and built a 36U slant cabinet for my other 200 series modules.  There is good historic Buchla reference material at www.fluxmonkey.com/historicBuchla/BuchlaIndex.htm

I've started a spreadsheet of module power consumption. I have measured some and consolidated comments I've found on various forums from others including Jim Fowler and Steffen Ahmad.

200 Series Module Power Consumption


The following links are pages for 4U 100 and 200 series format modules with my photos, build tips, operation, and calibration procedures.


Toppobrillo Mini-Bus and Xtndr power supply


25S Analogue Waveform Generator V1 and V2


102 Stereo Locator

111 Ring Modulator

140 Timing Pulse Generator

144 Dual Square Wave Generator

158 Dual Sine-Sawtooth Generator

204 Quad Spatial Director


205 Dual Matrix Mixer

207 V1, V2, V2.1, V3 & custom build Mixer/Preamp


208 V1 Stored Program Sound Source

208 V2 Stored Program Sound Source

208 V2.1 black version Stored Program Sound Source


Boops Card12 Replacement

Portabellabz perfBOB

Portabellabz VCS3 Card

Klinkenberg Sequencer Expander

Klinkenberg Triple Sequential Voltage Source  New


208 Stored Program Sound Source 1973/74 Early Version

Music Easel Manual 1974   

A scan of the manual

Music Easel Manual 1974   

A better color scan of the manual contributed by Luther R.


Aaron Lanterman has done several 208 derivative PCBs.

   Balanced Modulator

   Low Pass Gate

   Pulser and Inverter

   Timbre and Crossfade

   Envelope Generator


208 Dual Envelope Generator  based upon the above Envelope Generator PCB


211 Power Supply


212 Dodeca Module

216 Touch Controlled Voltage Source


218 V1 and V2 Touch Activated Voltage Source


221 Kinesthetic Input Port


227 System Interface V1 &V2

230 Triple Envelope Follower

232 Frequency Detector 1972 Early Version

244 CV Toolbox


245 Sequential Voltage Source

246 Sequential Voltage Source  New


248 'MARF' Multiple Arbitrary Function Generator V1 & V2 and Expansion

V2 Modifications


256 Dual Control Voltage Processor

257 Control Voltage Processor

258 Dual Oscillator V1, V2, & V3

259 Complex Wave Generator V1, V2 and Vintage


Verbos and Associates 263 Quantizer/Shift Register  New


265 Source Of Uncertainty

266 Source Of Uncertainty

275 Dual Equalizer/Reverb

277 Signal Delay Unit V1 & V2

BLM 277 Signal Delay Unit

280 Quad Envelope Generator


281 Quad Function Generator

284 Quad Voltage Controlled Envelope Generator

285 Frequency Shifter (Spin FV-1 version)

285 Frequency Shifter V2


285 Frequency Shifter 1977 Early Version


Verbos and Associates 288 Time Domain Processor


289 Dual Defect Processor

291 Voltage Controlled Filter

292C Quad Low Pass Gate V1 & V3

294 Four Channel Comb Filter

296 Programmable Spectral Processor



Vedic Scapes modules

259C Dual VCO

"Synton" Syrinx Filter Set Model 323

Quad Low Frequency Modulator

402 Quad Dual LFO

"Blacet" Time Machine

Metatron Generator Model 618

Wave Processor Model 45



Other 4U 200 series format modules

RSF Kobol Expander Dual VCO


Dual Waveform Generator Tau  New

My custom 24 dB VCF and Clock

My custom Oakely midiDAC

My custom Joystick