Mini solar organ (CB20506E)

This circuit was found in an old documentation and can be powered by a solar panel. The touch resistor is a nichrome wire.

NB FM audio amplifier (CB7462E)
Found in a documentation from the 90s, this circuit limits and amplifies a voice signal in the 800...
Four-quadrant photoconductive detector (CB20687E)
This circuit was found in documentation from the 90s. The operational amplifier is NE5514, which is...
Constant Voltage Source (CB24066E)
We found this circuit in the August 1970 issue of Radio Elecronics magazine. It uses the CA3018...