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UNIVERSAL VFO-BFO MODULE WITH SI5351
A Simple Metal Detector Circuit Using Beat Frequency Oscillator (BFO
The AA8V 6x2 Superheterodyne Receiver - BFO Schematic Diagram and
BFO Additonal Circuits
455_kHz_WITH_PRODUCT_DETECTOR_AND_BFO - Basic_Circuit - Circuit Diagram
Audio Frequency Generator Circuit Diagram - Wiring View and Schematics