Signal Tracer (CB22217E)

Using old germanium transistors like the CK722, this circuit has good gain. We found it in a publication from the 50s.

Bridge Photometer (CB18545E)
This simple photometer circuit uses an LDR as a sensor and the indicator is a sensitive...
Wien Bridge Oscillator (CB8089E)
This circuit generates sinusoidal signals between 300 and 3000 Hz. We find a 303 Circuits from the 90's....
Complementary Transistor Oscillator (CB946E)
This oscillator uses germanium transistor avaialble in 1958 when the project was published....