This circuit was found in a Popular Electronics from the 90s. It is intended to power the filament of old radio valves in recovery works. It is indicated for tubes that use 5 V of filament.
This power source can supply currents in the range of 100 mA to 1 A, depending on the transformer and the...
This circuit for receiving or transmitting low power was found in old American documentation. It is...
This circuit is suggested by the National semiconductor and is based on an increased power...