10.7 MHz Amplifier (CB4290E)

This is a classic FM amplifier IF amplification stage configuration. The circuit is from a 1980s documentation. CN is the neutralizing capacitor.

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Differential metal detector (CB7887E)
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Push-Pull Class B Transistor Amplifier (CB927E)
This circuit has more historical value than practical, unless the reader find all the components...
Busy Line Indicator (CB12442E)
We found this circuit in a 1991 publication. It indicates when an analog phone line is busy by...