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[linrad] Mixer design - comments please
With the help of some very good chaps on this list I am now comitted to
working on a General Coverage receiver to work with Linrad in the I/Q mode,
to receive SSB and AM, both amateur and broadcast. My design is based largely
on the SDR-1000 articles, and I have just finished the design of what should
be the Tayloe Detector part.
I have replaced the (too expensive) Instrumentation amps with a cascade of
NE5534's, and have (tentatively) reworked for a single +5V supply. What I
would like is for you chaps to have a look at my circuit and make any
criticisms and reccomendations you see fit: I only have enough resources at
the moment to make one board for each part and would like them to work first
time! BTW, I am using Eagle for the CAD of these bits.
If you feel I should give the Op-Amps a 10V supply please tell me, and if you
can explain why the input bias to the Tayloe detector in the SDR-1000 seems
to be 1V, when the Instr. Amps have the whole 10V to play with!
The url for the schematic is:
I can also put the Eagle files up there if anyone is interested.
BTW, I know I need some electolytics on the ouput to the soundcard!
Thanks muchly in advance,