Apollo's analog multiplexer - a very clever piece of 1960's engineering

[twospoons]

Found this  fascinating video about the massive analog multiplexer used in the Apollo missions' telemetry system. It uses BJTs with dual emitters and forward biased base-collector as switches, and square loop magnetic cores to control them.

[BrianHG]

I've been posting the full series here: https://www.eevblog.com/forum/chat/rf-porn-teardown-of-apollo-comms-the-s-band-transponder-and-amplifier/msg6151629/#msg6151629