The PS-1 is a high quality low voltage regulated power supply. It is recommended for use with solid state preamplifiers, active crossovers, filters, CD players, and other circuits with low-to-medium current requirements. The PS-1’s voltage can be fixed from +/- 5 volts to +/- 24 volts by the selection of a few resistors, and its output is capable of supplying up to one ampere of current. The regulators are rated at 3 amps, so if your current requirements are higher than 1 amp, a larger transformer can be substituted without altering the present circuit configuration. The supplied toroid transformer can be used with both 120Vac/60Hz or 240Vac/60Hz operation. The figure on page 2 depicts the schematic diagram of the PS-1 circuit. This power supply is similar to the one designed by Walt Jung and Gary Galo and published in TAA and uses the Linear Technologies LT1085CT/LT1033CT voltage regulators. These regulators are low dropout, high efficiency devices highly recommended for audio applications. The main differences between the TAA design and the PS-1 are: The PS-1 uses a smaller VA rated transformer and a lower value output filter capacitance (the 4A transformer was really overkill); More bypass capacitors are used throughout the PS-1 circuit to prevent transients and other supply-related noise from reaching the audio circuitry, we have added the schottky low-noise rectifier diodes, use Nichicon ultra low impedance electrolytics and most importantly the PS-1 is less expensive. Available with or without the toroid power transformer.

PS-1 Includes all parts, circuit board, toroidal transformer $118.00

PS-1A Includes all parts, circuit board, Less transformer $ 70.00

PS-1B Same as PS-1 but with smaller toroid transformer 5-14 Vdc @0.6A  $100.00

The following equation can be used to calculate the resistor values required for a specific output voltage:

Vout = 1.25 ( 1 + R1/R3) + R1 (50 x 10^-6)