Timer for Windshield Wiper (CB19868E)

This circuit found in old documentation can be used on old cars that do not have this feature. The integrated circuit used is uncommon today.

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Battery test (CB25306E)
This test circuit was found in the PE Hobbyst Handbook in a 1990s edition. The circuit tests the...
16 V Power Supply with Pulse Generator (CB14708E)
We found this circuit in GE's 1977 transistors manual. Transistors admit equivalents according to the...
Internal telephone exchange up to 9 extensions (CB17649E)
Here is a very useful circuit that can be expanded, including the use of more integrated circuits...