Syntiac pages - OB-VCF Module

Syntiac pages - OB-VCF Module

This filter is basically a dual RC filter with feedback, where the R's are replaced with OTAs. Changing the control current on the OTAs shifts the cutoff frequency of the two lowpass filters. Creating HighPass and BandPass by use of two lowpass filters is simply basic arithmatic in the frequency domain. Where HiPass=Input-LowPass and BandPass=Input-(LowPass+HighPass). The resistors scale all voltages to the correct levels. The feedback path creates a resonance peak around the cutoff frequency.

Conversor de dente de serra para triangulo e senoidal

Simple op-amp - Chapter 5: DISCRETE SEMICONDUCTOR CIRCUITS - Volume VI - Experiments

Simple op-amp - Chapter 5: DISCRETE SEMICONDUCTOR CIRCUITS - Volume VI - Experiments

Designing discrete opamps.

Designing discrete opamps.

Referencia para a minha montagem: o esquema elétrico do TB original.

"The Vocoder"

"The Vocoder"

Este vcf e' muito bom.

Link

Montei uma versao simplificada e funciona muito bem, apesar de ter uma queda de ganho nos graves.

minimoog vca

Link

Tuning A Discrete Minimoog

Tuning A Discrete Minimoog
Um oscilador de minimoog, no link "schematics".

SN# history

SN# history
Like the original modular oscillators, they used a exponential current source and a unijunction transistor to generate a sawtooth wave.

Synthesizer DIY pages

Synthesizer DIY pages

You've reached the Synthesizer DIY pages of René Schmitz!

SSM VCF Inside the monster

SSM VCF Inside the monster: "MAD SCIENCE SSM 2040 Voltage Controlled Filter with LFO"

Vide Vcfs high pass e lowpass.
E http://bermuda.ucd.ie/bridge/cs80.html

VCF complicado demais para o que eu quero