Two-channel mixer (T372E)

This mixer circuit was found in the 1961 RCA tube manual. The gain for each triode is approximately 20 times. The input impedance is high.

Temperature Controller (CB6010E)
This triac temperature control circuit was found in an 80s power semiconductor documentation. The circuit...
Complete Shift Register Using the 4027 (CB157E)
Figure bellow shows how n flip-flops can be associated to perform a shift register. Data is...
Automatic Station Finder (CB4318E)
This circuit is from 1986 documentation, being adaptable in radios of that time. The circuit uses the...