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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Voltage Relay (CB4151E)
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Differential Amplifier and 15 MHz Low Pass Filter (CB12514E)
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Combined light and dark switch (CB7869E)
Found in American documentation from the 90s, this circuit can be used as a shield with the...