This small and compact power supply is set up to furnish the voltages and currents usually required in elementary experiments with electronic circuits. It is stabilized with the aid of two voltage regulator tubes. Input fuses and an output indicator lamp are installed. Wire-wound three-terminal rheostats of ample overload capacity are used to adjust output voltages. The direct-current output from any one tap is limited to about 20 milliamperes, but two or more separate currents of this magnitude may be taken simultaneously from different taps. All parts of the circuit are insulated from the chassis and cabinet; therefore any one point in the circuit may safely be grounded. Also included is an unstabilized filament supply.