Picoammeter (CB6192E)

This circuit was found in a 1980s Intersil documentation. The integrated circuit used is not common today. The power supply must be symmetrical.

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Lock Timer (CB5980E)
It is like to the previous circuit with a lock that keeps the LED on at the end of the timer. The...
Fast logarithmic converter (CB9613E)
Found in old documentation, this circuit makes use of amplifiers of the time, uncommon today. Next...
SCR Power Control (CB13873E)
This full-wave circuit was obtained in Motorola's 1974 unijunction transistors manual. The circuit...