This amplifier uses a 1975 integrated circuit, which is uncommon today. The circuit has a gain of 30 dB and uses a transformer-less output with 9 V power.
We found this circuit in a Popular Electronics from the 90s. The circuit is for two-terminal...
This circuit can be used to listen for SSB signals on receivers that do not have the built-in...
This transmitter for the 40 meter or 7 MHz band was found in a magazine 73 for radio amateurs of...