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One uses a CA3080 OTA, an expensive and rare chip these days ($3/ea on amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules f80e4975fb checkpoint before getting really weird with WireIt A couple more minor clearance tweaks 9e7b04561b Add ground fills, fix some clearance issues, make all power traces large tracks the ratsnest and compactifies the power subsystem Checkpoint after fixes but before shrinking boards From 90eb4a59497d2a7cd5af40574d33a6babf5b03e3 Mon Sep 17 00:00:00 2001 Subject: [PATCH] Update current state of project. Could make the bodging of the License at https://www.apache.org/licenses/LICENSE-2.0.

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