marksard / eeaovco

Eurorack 8HP Single VCO using 3340 IC

EEAOVCO

Eurorack 8HP Single VCO using 3340 IC.

Specification

Power

Use Voltage	Current consumption
+12V	19mA
-12V	19mA

Input

Name	Description
V/OCT
FM
PWM
H.SYNC	NEG/POSI/BOTH are switched by jumpers on the back
S.SYNC

Output

Name	Description
PULSE	Bipoler 8Vpp
RAMP	Bipoler 8Vpp
TRIANGLE	Bipoler 8Vpp
SINE	Bipoler 8Vpp
RAMPH	Bipoler 8~11Vpp, Morphing between from RAMP+SINE to RAMP+PULSE

Controller

Name	Description
COARSE	About 0.6Hz～2.8khz (1nF) About 0.06Hz(16sec)～330Hz(11nF)
FINE	About ~8 semitone
PW	Pulse Width
PWM	PWM Depth
FM	FM Depth
RAMPH	Morphing between from RAMP+SINE to RAMP+PULSE

Image

Schematic

Waveform

Pulse(50%)

Pulse(0%)

Pulse(100%)

Ramp

Triangle

Sine(25%)

Ramph(0%)

Ramph(25%)

Ramph(50%)

Ramph(100%)

Triangle with FM

Triangle with H.Sync(NEG)

Triangle with S.Sync