Voltage Controlled Filter

I created a new voltage controlled lowpass filter in 2013. It is registered at Deutsche Patentamt as "Gebrauchsmuster" (registered design). This vcf can also be used as sine wave generator. Such filters are used in analog synthesizers.

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Schematic of the 4-pole filter
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I studied electrotechnical engineering in Köln / Germany. But my profession is technical assistant for metallography. I worked in the "Bundesanstalt für Materialforschung und -prüfung Berlin". In 2013 I invented an analog voltage controlled lowpass filter. My favourite pcb layout software is DesignSpark.

Voltage Controlled Filter

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