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BackAnd 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.
- Anode, https://dammedia.osram.info/media/resource/hires/osram-dam-5824137/SFH%204257_EN.pdf LED PLCC-2 SMD TOPLED.
- Relay 1-Form-B Schrack-RYII RM5mm SPST-NO Relay, 1-Form-B.