TA7642 Circuit
Here is my circuit diagram for a TA7642 based AM radio. This circuit also uses the LM386 audio amplifier set to a gain of 200. The values of the components are based on the official documentation, however other values such as Rp and Cp are mine based on practical experimentation. This circuit definitely works providing you attach a good earth and antenna between the coils.
This circuit is still very much a crystal radio with amplification, so signal quality is very important. You will need to make sure that all the fluorescent lights are turned OFF. Any kind of high powered electrical equipment in the room will also interfere with the signal, hence you will need to turn those OFF as well.
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TA7642 AM Radio - Project TomTA7642 AM Radio Baseboard Construction
Ferrite Coil
TA7642 Ferrite Coil Connection
Radio Stage
TA7642 AM Radio IC
TA7642 Power Resistor Rp
TA7642 Circuit Build
Amplifier Stage
LM386 Amplifier - TA7642 AM Radio
LM386 Circuit Build
Misc
TA7642 Circuit
TA7642 AM Radio Parts List
TA7642 AM Radio Parting Shots