12-06-2022, 10:38 AM
LR44 has too low a current limit. Even the CR2032 is too low for any set driving other than 4K earphones, use 3 stacks paralleled with 1N4148, and fuse on each stack. An 80V stack will go on fire if shorted. About 14c each online.
Use Zinc biscuit PP3 batteries, never Alkaline or lithium. Cheaper and safer!
I'd maybe try Alkaline button cells for HT of a one or two tube rod valve set with a "crystal earpiece". The modern ones are just a ceramic beeper disc, which will work with about 10 K ohms in parallel as a load on a diode radio or simple valve set. Make an insulated earbox for acoustics and safety!
Use Zinc biscuit PP3 batteries, never Alkaline or lithium. Cheaper and safer!
I'd maybe try Alkaline button cells for HT of a one or two tube rod valve set with a "crystal earpiece". The modern ones are just a ceramic beeper disc, which will work with about 10 K ohms in parallel as a load on a diode radio or simple valve set. Make an insulated earbox for acoustics and safety!
