Description : A friend tells me it's possible. That he only plays as he receives the signal. That he plays quietly, but does not need any batteries. Possible?
Last Answer : Yes. These were once my first attempts at electrical engineering. We called it "crystal". see here: http://www.tranzistor.cz/krystalka-a-radio.html more here: http://www.tranzistor.cz/krystalka- ... /1694-fm-krystalka-r% C3% A1dio-without-battery / 1694-fm-crystal-r% C3% A1dio-without-battery.html