Quadrature Modulator, analog synthesizer module 3rdWorldRack

Published on Jul 7, 2019 Sbranvlztronics

"The Quadrature Modulator comprises a Quadrature VCO (Yusynth VCLFO) and a "Dome Filter" (from J. Haible's Frequency Shifter)

The VCO portion has 3 potentiometers (coarse and fine frequency tuning and modulation CV attenuation), one CV input, 4 outputs and 4 LED indicators.

The dome filter section has one input and two outputs. The outputs are 90º phase shifted from each other. The video shows the waveforms from the VCO and Dome Filter on oscilloscope.

Differences from Yusynth Quadrature VCLFO are the capacitor value (1nF instead of 10nF), and changes in the freq control (fine tuning pot, reduction of the CV input resistor value).

It can operate at audio and sub audio ranges (0.2 to 4000 Hz approximately), but 1V/8ª tracking is only marginal (~2 octaves).

There is no significant differences in the dome filter circuit.

Some examples shown in the video:
Quadrature VCO controlling 4 VCOs, 1V/8ª CV for the Quadrature VCO input coming from the CV Quantizer.*
Frequency Shifter patch using the Quadrature Modulator and two Ring Modulators.*
Adding FM CV to Quatradure VCO (from the Arduino Clock Divider Logic Thing Octal DAC).*

Thanks for watching"

Frequency Shifter Patch: Oscilloscope and Spectrogram

Published on May 19, 2019 Sbranvlztronics

Follow-up to this post.

IQ Ring Modulation : analog Frequency Shifter patch

Published on May 15, 2019 Sbranvlztronics

"An Allpass filter network and a Quadrature VCO on protoboard, plus LFO and two Ring Modulators 3rdWorldRack modules."

I'd love to see the audio output on the oscilloscope.

Update:

Frequency Shifter Patch: Oscilloscope and Spectrogram

Published on May 19, 2019 Sbranvlztronics

3rdWorldRack synth jam

Published on Apr 14, 2019 Sbranvlztronics

"3rdworldrack modules built so far: 2 VCOs, VCF, ARP VCF, dual VCA, dual ARP AR (ADR), VCDelay, Mixer/LFO/Digisound Ring Modulator, Power Supply, Arduino CV Quantizer and CV Quantizer Extender, Arduino Clock Divider Logic Thing and Octal DAC."

Sbranvlztronics - Testing the almost finished CV Quantizer . 3rdWorldRack 'Jazz'

Published on May 27, 2018 Sbranvlztronics

"Testing the almost finished CV Quantizer . 3rdWorldRack 'Jazz'"

First video in eurorack format. You can find breadboard build videos for the Sbranvlztronics CV Quantizer in the archives here.