Стефан в рассылке поделился схемой своей активной Е-антенны, которая работает на VLF-граббере, расположенном на дереве в лесу.
I used to use the LMP7721 at work, so i tried it for VLF some years ago. For the Schumann's it performs well. My circuit runs on a remote site, 100% solar power driven, so i need to take care not to waste power when it is not necessary! I can't afford a heavy NPN emitter follower output stage running 100 mA drain current, like some people seem to favor. If i remember correctly, my circuit consumes 2.5 mA at 5 VDC. Schematic attached
