Crystal Radio 2 Diodes 1 Resistor pt2

I am a home learning electronics hobbyist and I find the simplest of circuits fascinating. I especially like the simple circuits which do so much. This two Diodes and 1 Resistor circuit really does receive radio broadcasts. I also noticed, the TDA7267 amp circuit works best at 6 volts. For some reason applying more voltage reduced reception and going lower than 6 volt the amp did not want to work.

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