Radio Road

Which tuner to get and getting the most from it. Thank God, for the radio!

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RE: It's almost a crude crystal radio but the tuning portion is connected wrong....

Posted by Eli Duttman on January 16, 2017 at 00:08:12:
Right you are about the diode attaching to the antenna. I missed that. Also, the place the diode is currently attached to should be grounded.

From my quick look at the LM386 data sheet, it does use low I/P impedance BJTs. Perhaps a simple JFET source follower between the diode and IC is needed. When I was a youngster, we used tapped tuning coils to connect to the diode and (ultimately) the BJT AF amp.

With a genuine long wire antenna and earth ground, a lightning arrestor is ESSENTIAL. That device can be made from a non-resistor spark plug.

Another tweak for the external antenna/earth ground setup is to connect them to a separate winding on the same form as the tuning coil. That winding has quite a fewer turns. Presto/chango step up transformer.