User manual
39
Document history
o 1996-09-13: Initial version of “Release notes”
o 1996-10-04: Updated to reflect the availability of patch sheets and polycarbonate face-plates.
o 1999-06-01: For V2.1C.; 1999-02-05: For V2.1B.; 1997-09-22: For V2.1A.
o 2000-03-09: Added a section on “Known Reliability Problems”.
o 2000-04-12: Added to the “Known reliability problems”:
Discussion of the CV input socket problem.
An update on the 32 bank memory system C-cell battery problem.
o 2003-11-11: Added section on Slide In for V2.1D. Split the Slide section into Slew and Threshold sections. Added schematic
of diodes for pre-V2.1C Slide In activation of Gate. Mentioned replacement pots in normal and long-shaft lengths. Minor
improvements to the text, such as a description of “random” patterns of data in memory chips which are “cleared”.
o 2004-02-12: Added the V3.0 notes.
o 2004-12-09: Added notes on V4.0 and corrected erroneous resting voltage for Filter Frequency, which is 3.3 volts but was
previously stated to be 2.3 volts.
o 2005-01-18: Added notes about V4.0A.
o 2005-02-10: Added notes about V4.0B. Added a section on power adaptors.
o 2005-08-15: Added notes about V3.0B.
o 2005-08-26: Added notes about V4.0C and 3.0C. Added C-cell battery section and extra information on battery voltages and
Run/Stop LED as a power supply voltage indicator.
o 2005-11-22: Added notes about V4.1.
o 2006-08-25: Added note about restricted active rotational range of replacement Resonance pots.
o 2007-08-31: Revised Boss adaptor details to mention PSA-120. Fixed a formatting problem.
o 2009-12-15: Added notes about V4.2.
o 2010-01-03: Replaced HTML page of “Release Notes” with this PDF User Manual.
o 2010-03-23: Corrected (page 16) “prior to version 2.1C can’t internally use the Slide In voltage” to refer to 2.1D.
o 2010-04-25: Added note in Introduction about occasional problem with the CV In socket. Revised the section about this
problem in the Known Reliability Problems section.
o 2010-08-16: Updates for:
Omron sealed tact switches instead of ALPS unsealed tact switches with a flexible internal dust guard.
The 2009/2010 batch of Technology Transplant 6 small pots, which should be more reliable than the previous batches and
the original ALPS pots.
We can now install White LEDs on the TB-303 front panel.
o 2010-09-19 & 2010-08-25: The stems of the Omron tact switches now modified with two cuts through the middle, rather than
by making the outside of the stems slightly smaller.
o 2012-01-14: Added note in Version 4.2 section about wire between Output socket and Volume pot to reduce background noise.
Updated the Power Adaptor section to cover the PSA-xx0S switching adaptors.
o 2012-10-05: Added sections for the optional Headphone socket, Audio In to Filter switch and Quicksilver 303 CPU
replacement system.
o 2013-09-19: Added mention of the MIDI In and Out system and a note about capacitive coupling to the mains in switch mode
power adaptors.
o 2013-11-02: Added section on V4.2A.
o 2014-09-16: Added to the V 4.2A section further information on: capacitors and resistors on the Sync socket for MIDI In or
MIDI In and Out; and on replacements for the six small pots.
o
2015-02-06: Added the Version 2.4B section. Updated the description of battery arrangements for memory backup and pointed
to a new manual DF-Memory-Backup.pdf which describes these fully.