Switched step down regulator (CB9950E)

Found in a 70s documentation, this circuit uses integrated circuits of the time, without further information about its operating conditions.

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Electronic Roulette (CB7002E)
Found in a Popular Electronics from the 90s, this game can be seen in other configurations on this site. The...
Single-Channel Radio Control Transmitter (CB3817E)
This single-channel remote control transmitter operating in the FM range uses common components and...
Astable Modulated CMOS (CB10724E)
Although it is a common configuration today, this circuit was taken from an old publication. The...