Here is a functionally identical ciruit using MPF102's EXCEPT they have no
emitter/source resistor.


http://www.seekic.com/circuit_diagram/Audio_Circuit/Mixer/SIMPLE_UTILITY_MI=
XER.html

       Circuit diagram only
<http://www.seekic.com/uploadfile/ic-circuit/s2009795657611.gif>

Here is a RF mixer  RF + LO to IF with commoned drains BUT they use dual
gate FETs


http://www.next.gr/uploads//112/Balanced-mixer-circuit-consisting-of-two-du=
al-gate-field-effect-transistor-formed.png

_________________

This not quite the same arrangement separates emitter but commons
collectors - used as a colour channel separator in a mechanical TV system -
sounds like a black hole :-)
Circuit http://www.hawestv.com/mtv_color/colorize_images/inv_mixer.gif
>From here  <http://www.hawestv.com/mtv_color/mtv_colorize2.htm>

_________

Event Horizon - mechanical TV page - legion

      http://www.hawestv.com/
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