Solar charger MC34064 (CB14537E)

The integrated circuit used in this charger is not very common today. The circuit is from Motorola's 1990 Linear Databook.

Current to voltage converter (CB7332E)
This circuit is from a Popular Electronics from the 90s. The integrated circuit admits equivalents...
Hall Lamp Timer (CB16406E)
This very interesting project was obtained in a 1980 publication. It consists of a device that is...
Freezer Alarm (CB1281E)
This circuit beeps when the sensor is triggered by the opening of the freezer door or other...