Xtal radio amp--no PS--Possible?

[captainkirksdog]

Hello,
A long time ago I saw a schematic for a crystal radio that had an audio amplifier that was powered by another crystal radio. I wasn't able to copy the schematic and have found nothing online about it. The radio-powered audio amplifier was used so high-impedance headphones would not be needed. Standard 8-ohm headphones were supposed to work. I've tried using 8-ohm 'phones with a 1000-ohm to 8-ohm transformer, but the audio level was very weak. Anyone have any helpful thoughts? Thanks. <ckd>

 

[forumlicker007]

Do you mean a crystal radio which has voltage doublers using a couple of small signal diodes?
https://hibp.ecse.rpi.edu/~john/xtal.html

 

[Nigel Goodwin]

Hello,
A long time ago I saw a schematic for a crystal radio that had an audio amplifier that was powered by another crystal radio. I wasn't able to copy the schematic and have found nothing online about it. The radio-powered audio amplifier was used so high-impedance headphones would not be needed. Standard 8-ohm headphones were supposed to work. I've tried using 8-ohm 'phones with a 1000-ohm to 8-ohm transformer, but the audio level was very weak. Anyone have any helpful thoughts? Thanks. <ckd>

I know the sort of thing you mean - using a VERY, VERY high power, VERY, VERY local, transmitter to power the audio amplifier - but you're going to struggle in almost all places finding a local station striong enough.

Buy yourself a crystal earpiece - even better than old 2000 ohm ones.