Second Attemp



After the first not so positive try, I decided to build my own receiver using the same concept. after the 1€ receiver, here ist the 2€ receiver. The 2 transistors are replaced by a double balanced mixer (ne602/612). The tuning process ist the same.
The received signal is stronger, the signal-noise ratio is much better (between 15 and 19dB).



the schematic (click to enlarge)

the schematic (click to enlarge)
Received spectrum

The next step is the Digital Direct Synthesis Receiver, to listen to all DRM broadcast between 0.5 and 30Mhz.