Mini Organ (CB21653E)

This toy organ was found in Popular Electronics from January 1967. It can be constructed from modern equivalent transistors.

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...
Ladder Generator (CB15660E)
The presented circuit generates a signal in the form of a ladder that can be useful for surveying the...
Charge and Discharge Current Sensor (CB5256E)
This 2005 Linear Technology circuit has separate outputs for monitoring the charge and discharge...