A battery eliminator
is a device powered by an electrical source other
than a battery
, which then converts the source to a suitable DC voltage
that may be used by a second device designed to be powered by batteries.
A battery eliminator eliminates the need to replace batteries but may remove the advantage of portability. A battery eliminator is also effective in replacing obsolete battery designs.
Some examples of battery eliminators:
Early commercial battery eliminators were produced by Edward S. Rogers, Sr.
company in 1925, as a complement to his line of "batteryless" radio receiver
. Another early producer of battery eliminators was the Galvin Manufacturing Corporation (later known as Motorola
) which was opened on September 25, 1928 by Paul Galvin
and his brother Joseph E. Galvin, to build battery eliminators for radio receivers installed in automobiles.
While it might seem surprising to use such a device in a car to power a radio, the first car radio
receivers were based on vacuum tube
technology which required two or three different voltages to function:
- LT, typically 4 or 6.3 volts at high current to power the filaments
- HT, typically 100 to 300 volts at low current to power the anode circuitry
- Additional voltages were sometimes also required for grid bias.
Batteries designed... Read More