Voltage probe (CB8184E)

Found in a 90s Popular Electronics, this circuit uses general-purpose transistors, serving to indicate the polarity of circuits.

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Low temperature sensor (CB7814E)
Found in 90s Radio Electronics, this circuit is indicated for reading temperatures below zero....
Voltage converter for pulse duration (CB6095E)
This circuit was found in a Signetics documentation from the 1980s. Next to the figure are the...
Light-Activated AND Gate 1 (CB5317E)
This circuit makes use of an unusual component today, a LASCR. It is a light-activated SCR. The...