Using the MC3335P low
power narrow band FM receiver can be designed a very simple 80m SSB
receiver electronic project circuit using few electronic parts. The
MC3335P low power narrow band FM receiver includes dual FM conversion
with Oscillators, Mixers, Quadrature Discriminator, and Meter
Drive/Carrier Detect Circuitry.
The electronic project is very simple , requiring few external
components and it includes a simple audio power amplifier based on a
LM386 audio IC. Because the IC require a input voltage between 2 and 6
volts and the LM386 require a 9 volts DC power supply , in this circuit
is used two fixed three terminal regulators. Tuning of this receiver
circuit is done either with a varactor diode or variable capacitor as
shown in the circuit below .