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* Otto's DIY Cookbook: | * Otto's DIY Cookbook: | ||
https://github.com/intechstudio/ottosdiy/blob/master/Cookbook/Vol.%201/Otto's%20DIY%20-%20Cookbook%20(Vol.%201).pdf | https://github.com/intechstudio/ottosdiy/blob/master/Cookbook/Vol.%201/Otto's%20DIY%20-%20Cookbook%20(Vol.%201).pdf | ||
* DIY Synth Series | |||
https://www.allaboutcircuits.com/projects/diy-synth-series-vco/ | |||