Our facilities permit the finished power supply or filter to be cost as a solid epoxy assembly, dipped epoxy, oil filled, air insulated, or any combination of these features. The decision which influences the method of insulation between parts depends on many factors: outage, heat generation, size requirements, altitude, shock, vibration, etc.

These power packs or filters can be cased or of open chassis construction, with or without dust covers. Thin rack type units can also be designed. Terminations can be plug-in high voltage connectors, stand-off steatite terminals, or wire leads. Low voltage test points or metering circuits can be included in the design. Filament voltages or high AC voltages can also be included.

Selenium rectifiers are generally used for currents up to 10 milliamperes. Silicon rectifiers are used for higher currents or higher temperatures. Class O, A, B or F insulation is used to meet specific operating temperatures. Special capacitors and transformer designed for the specific power packs and filters are built at PLASTIC CAPACITORS, INC. All basic materials are supplied by well established firms which maintain high quality levels. Components are chosen with adequate deratings to meet specifications. Complete environmental testing facilities are available at our plant.

It is desirable for certain types of apparatus and equipment to design with encapsulated components. The PCI "F" series consist of filter and rectifier networks, encapsulated in epoxy.

These are vacuum processed and pressure filled to be void free. Expoxies are used which have high thermal shock resistance as well as suitable electrical characteristics. The encapsulated components are made of treated materials which are compatible with the epoxies. Cases are made f an insulating material. The usual finish is light bluegray lacquer. The resulting package is capable of withstanding thermal and mechanical abuse.

Low voltage terminations are brought out to solderable turret lugs or wire leads. High voltage terminations are brought out with high voltage cables or to high voltage jacks. Mounting provisions are stainless steel studs extending from the base of the case.

The following information, if pertinent, is required to properly design filters, power supplies, etc. This data will enable the PCI engineering staff to design the optimum unit.

1. Input Voltage Including Variation.
2. Input Frequency Including Variation.
3. Output Voltage Including Tolerance.
4. Output Current Including Variation and Type of Load.
5. Ripple in Percent RMS or Percent Peak to Peak.
6. Altitude Operating and Transport.
7. Vibration Requirements.
8. Humidity and Salt Spray.
9. Life Expectancy.
10. Terminations.
11. Enclosure.
12. Metering.
13. End Use.

The following types are available.

These are complete POWER PACKS which operate from 60 cycle or 400 cycle sources. They contain the high voltage transformer, rectifiers, capacitors and resistors.
Selenium or silicon rectifiers can be supplied depending on current and temperature requirements. Output potential can be supplied from a 1,000 volts up to 25,000 volts DC. Ripple levels as low as 0.1% can be maintained.

The FR-type circuitry consists of rectifiers, capacitors, inductors and resistors as required. They are designed to operate from an external transformer which can be powered by line frequencies of 60 and 400 cycles, and by other sources of power up to 10KC.
A sine wave, square wave or other wave shape can be used. A considerable size and ripple reduction can be made by operating the POWER PACKS at high frequencies. Half wave or full wave multipliers can be made for low power level units to reduce transformer size.

PCI filter blocks are useful where ripple reduction and small size are necessary. Less output capacitance results which reduces the RC time constant and shock hazard.
Series resistors or chokes are provided depending on the current and regulation desired. Load currents up to 5 ma approximately can economically utilize resistors.
Chokes are more efficient at current levels above 5 ma. One or more stages of Pi networks can be included in one or more blocks.