Available as an assembled Module and as a DIY project.
This Module is currently available.
Dual Rectifier and Frequency Doubler
Dual RECTIFIER offers two clipping and frequency doubling sections.
The first output clips inputs below mid-grey and accentuates the bright portions of the signal. The second output clips signals below mid-grey and accentuates the darker portions of the signal. The third output gives a single stage solarization or frequency doubling effect.
The third output of the first section is normalled into the section input’s section for more variations of one signal. Putting a signal into the top input and taking the bottom output will give you a twice frequency doubled output.
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These merchants probably sell this module. Huh?