Spectrum Analyzer Adapter for Oscilloscopes


The circuit shown in the following schematic diagram is a simple spectrum analyzer adapter circuit for oscilloscopes. This circuit can be used for scanning or monitoring a segment of radio spectrum or amateur band.  Inside this circuit,  an NE602 mixer chip generates a 455-kHz IF signal. The U2 is used to amplify the signal. Then the amplified signal is fed to Y axis of an oscilloscope and detector D2. The horizontal axis input of scope is driven by Vt. Here is the  schematic diagram of the circuit:

Spectrum Analyzer Adapter for Oscilloscopes
Using L2 and L3 shown, the frequency range of this circuit is 10 to 15MHz. L1 is homemade or commercial variable inductor. L3 and L2 are T-50 or T37 toroidal cores. [Circuit’s schematic diagram source: seekic.com]


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