It turned out that it was possible to create a simple tuned radio frequency (TRF) receiver by implementing the two features of the LM386 mentioned earlier and using a tuned standard MW ferrite rod inductor on the input. During the troubleshooting, it became apparent that the LM386 was acting as a high gain RF envelope detector, which could be used as an AM receiver by simply connecting a tuned circuit to its input. The LM386’s potential as a radio receiver was discovered a number of years ago while investigating anomalous behavior in a receiver that used one of these devices. Wow the engineering world with your unique design: Design Ideas Submission Guide In this configuration, the maximum voltage gain that may be achieved is in excess of 70 dB. A resistor with a value of 10 Ohms would give a gain of 15,000/10=1,500. This results in an extremely high undetermined audio gain of 15,000/?, but it may be defined by adding a small resistor in series with the 10 μF bypass capacitor. Moving the bypass capacitor between pin 1 and ground effectively bypasses the negative feedback resistors that determine the AC audio entirely. When a 10 μF capacitor is placed across pins 1-8, it bypasses the 1350 Ohm feedback resistor, causing the single input gain to change to 15,000/150=100. 【Download】The QA exchange deck in Solido Crosscheck enables an IP qualification handshake
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