Mini Organ (CB21653E)

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

4040 Oscillator (CB14984E)
This traditional rectangular oscillator configuration generates signals up to a few megahertz...
Music Generator (CB9882E)
This circuit is just a curiosity found in a 1990 documentation, since the integrated circuit used...
Voltage Drop Alarm (CB1530E)
This circuit goes into operation producing a sound on a small speaker when the supply voltage...