If you take a piano and play the middle A note (A4), it makes a specific tone which has a frequency of 440Hz. Why do we need an exponential converter? The answer is in the nature of human hearing and music theory! This converter will take a linear voltage in and produce an exponential voltage which is fed into the VCO. Now for this module to work correctly, it needs an exponential converter on the input. This means that for every 1V increase on the input, the output frequency will go up by one octave (i.e., by a factor of 2). The synthesizer that we will be designing was extremely common back in the day. In this project, we will be building the heart of the synthesizer, the VCO (voltage-controlled oscillator), which takes in analogue voltages and generates the raw sounds ready to be further processed by filters, modulators, ADSR modules, and step sequences.Ī Minimoog Model D synthesizer (the kind used by Kraftwerk from the 70s to 1981). 311 TRANSISTOR PANDORA HOW TOHow does an old fashion synthesizer work? This series of projects will show how all the different parts in a synthesizer work and how to build your own modules. These synthesizers (unlike most ones you will find today) were all analogue which means that, instead of relying on software and processors, the sound generation was done by manipulating electrical signals against time. Music used to be done entirely with REAL instruments such as guitars and pianos but synthetic sounds have made their mark on the musical scene, as well. A great band to look at for an example is Kraftwerk, which in the 1970s used synthesizers to create all their sounds from the aggressive sawtooths to the gentle beep and boop of a computer. Today’s music is mostly made using computer software to master tracks, add instrumentals, mix songs, manipulate sounds and much more- but how do they use to make music? Learn how to make your own old-school 1V/octave synthesizer.
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