The circuit is from a June 1995 Electronics Now. The relay is power-dependent and both R1 and R2 should have close resistances in operation.
This receiver uses only one transistor but has excellent sensitivity to the mid-wave range. The...
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We...
This circuit was found in old FET documentation, but it applies to any modern common JFET. The...