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On amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some supporting components. ~$6 in parts, needing only one side to center of package, Thorlabs photodiodes TO-46-3, Pin2 at center of hole, with a diameter between 16-19 mm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, CR1220 battery holder, http://www.comf.com.tw/ProductDetail.asp?no=148 Keystone type 103 battery holder coin.

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