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  2. Wetting current - Wikipedia

    en.wikipedia.org/wiki/Wetting_current

    A related term sealing current (aka wetting current or fritting current) is widely used in the telecommunication industry describing a small constant DC current (typically 1-20 mA) in copper wire loops in order to avoid contact oxidation of contacts and splices.

  3. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    The best example is Flanges, there are multiple holes in the Flanges, the circle through the center of these holes is known as the pitch circle, and the diameter of this circle is known as Pitch Circle Diameter, in short PCD. PDM, PDMS: product data management, product data manager [app], product data management system [app]

  4. Via (electronics) - Wikipedia

    en.wikipedia.org/wiki/Via_(electronics)

    Another usage of PTH is known as a castellated hole where the PTH is aligned at the edge of the board so that it is cut in half when the board is milled out of the panel - the main usage is for allowing one PCB to be soldered to another in a stack - thus acting both as a fastener and also as a connector.

  5. Printed circuit board - Wikipedia

    en.wikipedia.org/wiki/Printed_circuit_board

    Through-hole (leaded) resistors Through-hole devices mounted on the circuit board of a mid-1980s Commodore 64 home computer A box of drill bits used for making holes in printed circuit boards. While tungsten-carbide bits are very hard, they eventually wear out or break. Drilling is a considerable part of the cost of a through-hole printed ...

  6. Bolt circle - Wikipedia

    en.wikipedia.org/wiki/Bolt_circle

    Drawing of 5-hole (left) and 4-hole (right) pitch circles A bolt circle diameter or pitch circle diameter ( PCD ), sometimes simply called bolt circle or pitch circle , is a common term for when a number of screw holes for bolts are evenly distributed with their centers along an imaginary circle with a given diameter .

  7. Single-ended primary-inductor converter - Wikipedia

    en.wikipedia.org/wiki/Single-ended_primary...

    Inductor L1 and switch S1 create a standard boost converter, which generates a voltage (V S1) that is higher than V IN, whose magnitude is determined by the duty cycle of the switch S1. Since the average voltage across C1 is V IN , the output voltage ( V O ) is V S1 - V IN .

  8. Through-hole technology - Wikipedia

    en.wikipedia.org/wiki/Through-hole_technology

    Through-hole (leaded) resistors. In electronics, through-hole technology (also spelled "thru-hole") is a manufacturing scheme in which leads on the components are inserted through holes drilled in printed circuit boards (PCB) and soldered to pads on the opposite side, either by manual assembly (hand placement) or by the use of automated insertion mount machines.

  9. Probe card - Wikipedia

    en.wikipedia.org/wiki/Probe_card

    Many wafers today are still tested one device at a time. If one wafer had 1000 of these devices and the time required to test one device was 10 seconds and the time for the prober to move from one device to another device was 1 second, then to test an entire wafer would take 1000 x 11 seconds = 11,000 seconds or roughly 3 hours.