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KBD 2e

Keyboard Converter

Other names for this product: kbd2e,
Courtesy/Thanks to: EFM

Description: Please observe that this project IS
NOT suported by EFM anymore


Keyboard converter / interface.
Features...
- 1 volt per octave control voltage
- Key gate
- Modulation LFO
- Modulation VCA
- Scaleable over 8 octaves.
- +/-12 or +/- 15V
Requires one or two switch per key
keyboard with a voltage divider of 1
resistor per key 100ohm 1%.
Like most EFM modules the KBD2e is multi
functional. It's primary function is to
convert a cheap plastic keyboard into a
synthesizer controller. It can be built
on a panel and bolted in the rack or
installed in the keyboard case. Getting
the keyboard can be a problem. The
easiest to convert I have found so far
are the four octave Casio's. Once you
have one you can ether build it in the
case it came in or remove the keyboard
and build it a more useable new case.

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CV 


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Files
kbd2e.pdf
   Information, Assemblyplan, Schematics and parts list for the KBD2E.
kbd_2e_forum.pdf
   PDF with the old EFM forum about the KBD2E.
efm_kbd2e.jpg
   Picture of the EFM KBD2e Keyboard to CV converter
Manufacturers
EFM
   Electronic for music
Parts used
1N914
   High Conductance Fast Diode
2N3819
   N-Channel RF Amplifier
2N3906
   PNP switching transistor
2N3904
   NPN switching transistor
TL072
   Low-Noise JFet-input Operational Amplifier
LM13600
   Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers