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2. Power supply unit (computer) - Wikipedia

   en.wikipedia.org/wiki/Power_supply_unit_(computer)

   A power supply with a 24-pin connector can be used on a motherboard with a 20-pin connector. In cases where the motherboard has a 24-pin connector, some power supplies come with two connectors (one with 20-pin and other with 4-pin, i.e. 20+4-pin form) which can be used together to form the 24-pin connector.

3. ATX - Wikipedia

   en.wikipedia.org/wiki/ATX

   An ATX power supply provides a number of peripheral power connectors and (in modern systems) two connectors for the motherboard: an 8-pin (or 4+4-pin) auxiliary connector providing additional power to the CPU and a main 24-pin power supply connector, an extension of the original 20-pin version. 20-pin Molex 39-29-9202 at the motherboard. 20-pin ...

4. 7400-series integrated circuits - Wikipedia

   en.wikipedia.org/wiki/7400-series_integrated...

   The pin assignment of this early series differed from the de facto standard set by the later series in DIP packages (in particular, ground was connected to pin 11 and the power supply to pin 4, compared to pins 7 and 14 for DIP packages). [5] The extremely popular commercial grade plastic DIP (7400N) followed in the third quarter of 1966. [18]

5. IC power-supply pin - Wikipedia

   en.wikipedia.org/wiki/IC_power-supply_pin

   These are known as the power-supply pins. However, the labeling of the pins varies by IC family and manufacturer. However, the labeling of the pins varies by IC family and manufacturer. The double subscript notation usually corresponds to a first letter in a given IC family (transistors) notation of the terminals (e.g. V DD supply for a drain ...

6. 555 timer IC - Wikipedia

   en.wikipedia.org/wiki/555_timer_IC

   The dual version is called 556. It features two complete 555 timers in a 14-pin package; only the two power-supply pins are shared between the two timers. [21] [16] In 2020, the bipolar version was available as the NE556, [21] and the CMOS versions were available as the Intersil ICM7556 and Texas Instruments TLC556 and TLC552.

7. Dual in-line package - Wikipedia

   en.wikipedia.org/wiki/Dual_in-line_package

   When the identifying notch in the package is at the top, Pin 1 is the top left corner of the device. Sometimes Pin 1 is identified with an indent or paint dot mark. For example, for a 14-lead DIP, with the notch at the top, the left leads are numbered from 1 to 7 (top to bottom) and the right row of leads are numbered 8 to 14 (bottom to top).