Receiver with VFO / Mixer

In the same theme as other MPF102 oscillators shown in this week.  Interesting the designer added an ‘optional’ buffer stage for the VFO.  The NE602 Mixer so common these days in lieu of standard dual gate FET or balanced mixer techniques.  Interestingly, the optional transistor dedicated as an oscillator component in the NE602 is not often used in these items of equipment, instead, a separate high stability VFO being maintained.
vfo and 602
In this next circuit, a good use is made of the oscillator active component within the NE602.
ne602 circuit design