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
$128.00
PS-1A Includes all
parts, circuit board, Less transformer
$ 80.00
PS-1B Same as PS-1 but
with smaller toroid transformer 5-14
Vdc @0.6A $110.00
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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