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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 $140.00
PS-1A Includes all parts, circuit board, Less transformer $ 85.00
PS-1B Same as PS-1 but with smaller toroid transformer 5-14 Vdc @0.6A $125.00
Please specify desired output voltage.
Typical outputs available are +/-5V, +/-12V, +/-15V, +/-18V, +/-24V
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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)
The table below lists resistor values for several common voltages. If you order
our kit, be sure to specify which voltage you will be using, and we will send you the correct values.
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Resistance
R1/R2 = 2.74 Kohm R3/R4 = 1.00 Kohm
R1/R2 = 10.0 Kohm R3/R4 = 1.21 Kohm
R1/R2 = 10.5 Kohm R3/R4 = 1.00 Kohm
R1/R2 = 12.1 Kohm R3/R4 = 0.95 Kohm
R1/R2 = 33.2 Kohm R3/R4 = 1.91 Kohm
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Voltage
+/- 5 Volts
+/- 12 Volts
+/- 15 Volts
+/- 18 Volts
+/- 24 Volts
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