Doepfer DIY Synth do-it-yourself analog synthesizer - Manual (Page 11)

User's Guide page 11 DIY Synth Kit
JP2: VCO and VCF connections
JP2 contains some VCO and VCF terminals.
ribbon cable pin header top view
Function Explanation Remark / Recommendation
VCO PW CV2 Control voltage input #2 for
rectangle pulsewidth Range about 0…+5V, recommended for
PWM input (socket with attenuator)
VCO PW CV1 Control voltage input #1 for
rectangle pulsewidth Range about 0…+5V, recommended for
PW manual control
VCO PW CV SUM Control voltage summing
input for rectangle
pulsewidth
Required only if the number of CV inputs
for pulsewidth has to be increased, serial
resistor 100k recommended for 0…+5V
VCO RECT VCO rectangle output about 5V level (+/- 2.5V), DC coupled
VCO CV1 Control voltage input #1 for
VCO frequency Sensitivity: 1V/octave, e.g. for manual
frequency control
VCO CV SUM Control voltage summing
input for VCO frequency Required only if the number of frequency
CV inputs is not sufficient, serial resistor
100k required for 1V/octave
VCO CV3 Control voltage input #3 for
VCO frequency Sensitivity: 1V/octave, e.g. for CV input
socket
VCO CV4 Control voltage input #4 for
VCO frequency Sensitivity: 1V/octave, e.g. for CV input
socket
VCO CV2 Control voltage input #2 for
VCO frequency Sensitivity: 1V/octave, e.g. for FM input
(socket with attenuator)
VCO SAW VCO sawtooth output about 6V level (+/- 3V), AC coupled
VCO SYNC Hard Sync Input Negative slope causes a sawtooth reset
(rectangle or sawtooth input required,
min. level 5V required)
2 x GND
VCF RES IN
VCF resonance connector Has to be wired to the VCF Bandpass
output via attenuator (resonance control,
recommended value 50...100k linear)
VCF AUDIO IN VCF audio input Usually connected to one of the VCO
outputs via attenuator (for clipping/
distortion control), if both VCO
waveforms have to be mixed the VCF
AUDIO SUM has to be used (see JP7)
VCF BANDPASS VCF bandpass Output Usually connected to a socket labelled
"VCF Bandpass", also required for
resonance control (VCF RES IN)