Passive tunable filter (CB7407E)

Found in American documentation from the 1980s, this circuit is a basic signal rejection filter network using only passive components.

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Mixer (CB26099E)
We found this 4-channel mixer in the August 1999 issue of Electronics Now magazine. The circuit can...
Gain 10 Amplifier with the CA3140 (CB12305E)
The configuration shown makes use of a simple source and the gain is given by the relationship between R3...
HFE meter with LED Indicator (CB17001E)
This circuit was found in a 1995 documentation and is very simple to assemble, as the components are...