06-10-2021, 06:25 PM
(This post was last modified: 06-10-2021, 06:33 PM by Mike Watterson.)
(06-10-2021, 05:37 PM)BusyBee Wrote: I too have that Nasa schematic. I also have a copy of the document that it came from, if anyone is interested. It does show four circuits, if I remember rightly.Yes, please.
But you could run two with filament in series, 16 mA to 18 mA and the gm is squared.
I did a very low power TRF AM radio once by using very low collector currents, which means low gain, but the gains multiply and the currents add. Ran for over a month with no on/off and a crystal earphone off an AAA cell. Matchbox, small rod aerial and no aerial wire. MW & LW. Penalty is it's noisier.
