Buffer for VFO (CB7282E)

This circuit was obtained in a Popular Electronics from the 90's. The gain depends on R4 and R3. Transistors are general purpose types.

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Schmitt Trigger (CB10113E)
The integrated circuit used in this trigger is uncommon today. We found it in a documentation from...
Proximity Detector (CB15584E)
The circuit shown in the figure is based on the ST Microelectronics TDEO0160 (www.st.com) and...
Microphone Preamplifier (CB14734E)
This low impedance microphone preamp is from a 1957 Raytheon publication, using germanium...