AC Tachometer (CB9353E)

This circuit was found in a 1969 EEE. It detects when there is a phase failure in a circuit using an inductive sensor.

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Binary Neon (CB6806E)
This flip-flop with neon lamps was found in a 1969 publication that deals precisely with neon...
Indicator for windscreen wiper (CB6038E)
This sophisticated circuit is from old Motorola documentation, using common integrated devices...
Preamplifier with NE542 (CB1258E )
This circuit is from the Philips manual of 1990. The integrated circuit is not very common. The...