This is yet another balanced modulator circuit for SSB transmission. This two-diode circuit was found in a 1980s documentation. The diodes are commonly used.
This circuit uses the LM34 sensor for degrees Fahrenheit and has a scale from 3 to 300º F...
This radio's transistor is powered with the signal's own energy, producing its amplification....
In this circuit the CA3140, an operational amplifier, is used as a comparator with the zener diode...