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BackAn 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 schematic start, and some example modules 811ef45c764021f623b8bb59234df1314fce4e91 12V, -12V and ground needed, probably up to 1amp
- LED, Round, FlatTop, diameter 3.0mm, 2.
- 10VA, neutral, http://www.eratransformers.com/product-detail/18 Trafo Printtrafo CHK EI38.
- Center 3.0mm, 2 pins, diameter 3.0mm z-position.
- Https://abracon.com/datasheets/PRO-OB-471.pdf Antenna ProAnt OnBoard 868Mhz 915Mhz.