TinySDR by LY1GP It's a very simple direct conversion receiver consisting of nothing more than three parts:
1) Simple LC band pass filter;
2) Mixer; and
No AF amplifier stage, it just feeds the output direct to the sound card MIC input and leaves it to do the amplification etc. Oh, and the VFO is coupled into the mixer via a phase transformer thereby providing two different phases - one at 0 degrees and one at 90 degrees - and thereby making the output that of (I believe) an IQ SDR receiver.
My 1st version work very nice ,It need more work at VFO.
tnx VK1IS for the webblog .
See a Clip at youtube