At your risk. Batteries are potentially dangerous devices if protection for overcharging, short circuit etc is not implemented. A fuse also should always be used is series for fire hazard safety.
A small gift from Vicky was a miraculous tiny key chain holder which consists of a small box containing a solar cell. As it seems the solar cell continuously charges an internal battery or capacitor even when there is no direct sunlight. It is just sitting anywhere in a living room. Then a small switch lights up a bright LED when needed.
Is it possible to power in this way small Pleiades with minimum number of components. 1 or 2 active device amplifiers (see earlier posts) so that they have the advantage of being battery powered without the hassle of inserting batteries?
For example the Pleiades one transistor headphone amplifier in class A. It is automatically powered when the headphones are inserted as the headphones themselves are the emmiter load, collector load or the source follower load, drain load etc.
Or a Pleiades mic booster amplifier. Few tens of micro amps are enough for great sound and low noise, see older posts. A schematic like Pleiades V6 but with a bipolar transistor of JFET or even a direct filament electron tube.
If the JFET or bipolar transistor is feeding a hi fi line in device then the input resistor can be the load resistor of the mic booster amp. So again powering can be done automatically by connecting the devices together.
In other cases such mic booster amps can be phantom powered by the next device. For example an iPad which gives a small voltage ag it's headphone socket for condenser electret microphones.
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