FRMT SustainerA Greatly Improved LM386-Based Sustainer Circuit

From the vendor

After reverse engineering the Sustainiac Stealth, I was contacted by several people who lived in foreign countries that, for various reasons, were unable to find the PCB's or parts necessary to make the circuit themselves and the cost of PCB assembly services were prohibitively high. Given these circumstances, I decided to challenge myself to come up with a sustainer circuit that would work really well but would be buildable with the most common parts available. I decided that what I would attempt would be to use an incarnation of the Sustainiac Stealth opamp stages, but simplified as much as absolutely possible, with an LM386 power amp. Additionally, I wanted to use through hole parts and layout so that people could use perf board, vero board, or fabbed PCB's depending on their circumstances and preferences.

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The LM386 amplifier is the most common amplifier used in DIY sustainers, bu