The PS-19 is a regulated bipolar power supply that puts out low-voltage bipolar voltages between +/-5Vdc to +/-24Vdc. It uses an LM317 for the positive output and an LM337 for the negative output. The PS-19 PCB is only 3.7" by 3.2" and, like all GlassWare PCBs, is extra thick (0.094 in), US-made, with heavy 2-ounce copper traces. The rectifiers used are ultra-fast MUR410G types, each of which are shunted by a 0.1µF ceramic capacitor to reduce RFI creation. The power supply requires an external power transformer.
The kit includes all the parts, capacitors, resistors, rectifiers, regulators, including the user guide, and four sets of standoffs and screws and O-rings. It offers the option of a 1.5in or 2.5in tall heatsinks. Most OpAmp-based circuits draw relatively little current, say a total of 50mA, which against a voltage regulator's voltage drop of 4Vdc equals only 0.2W of heat. But if the OpAmp circuit is a headphone amplifier or a complex OpAmp-based circuit, then the larger heatsinks become a much bigger asset.
The PS-19's schematic is simple and straightforward. A full-wave bridge rectifier circuit converts the secondary's center-tapped AC voltage to bipolar DC voltages. Thereafter, the positive and negative adjustable regulators put out the desired rail voltages. The actual star of this show is the rectifier, a MUR410G, which is an exemplary 4A/100V rectifier, which offers ultrafast 25nS recovery times, 175°C operating junction temperature, low forward voltage, and low leakage current. Co-staring in the PS-19 are capacitors C7 & C8, which are Panasonic FM series types, a low-ESR capacitor adored by many audiophiles—well, at least those in the know.
The new PS-19 can deliver a bipolar voltages between +/-5V to +/-24V by selecting different values for resistors R2.