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  2. Charlieplexing - Wikipedia

    en.wikipedia.org/wiki/Charlieplexing

    A Charlieplexed digital clock which controls 90 LEDs with 10 pins of a PIC 16C54 microcontroller.. Charlieplexing (also known as tristate multiplexing, reduced pin-count LED multiplexing, complementary LED drive and crossplexing) is a technique for accessing a large number of LEDs, switches, micro-capacitors or other I/O entities, using relatively few tri-state logic wires from a microcontroller.

  3. LED circuit - Wikipedia

    en.wikipedia.org/wiki/LED_circuit

    Simple LED (Light Emitting Diode) circuit diagram. In electronics, an LED circuit or LED driver is an electrical circuit used to power a light-emitting diode (LED). The circuit must provide sufficient current to light the LED at the required brightness, but must limit the current to prevent damaging the LED.

  4. List of 7400-series integrated circuits - Wikipedia

    en.wikipedia.org/wiki/List_of_7400-series...

    line driver/memory driver circuits - MOS memory interface, damping output resistor 16 SN74S436: 74x437 1 line driver/memory driver circuits - MOS memory interface 16 SN74S437: 74x438 1 system controller for Intel 8080A (equivalent to Intel 8238) 28 SN74S438: 74x440 4 quad tridirectional bus transceiver, non-inverting outputs open-collector 20 ...

  5. TL431 - Wikipedia

    en.wikipedia.org/wiki/TL431

    The IC, loaded with the very low impedance of the LED, operates as a current source; undesirable voltage ripple passes from the output rail to the cathode almost unimpeded. [36] This "fast lane" dominates at mid-band frequencies (ca. 10 kHz–1 MHz), [ 37 ] and is usually broken by decoupling the LED from the output capacitor with a zener diode ...

  6. ULN2003A - Wikipedia

    en.wikipedia.org/wiki/ULN2003A

    The drivers can be paralleled for even higher current output. Even further, stacking one chip on top of another, both electrically and physically, has been done. Generally it can also be used for interfacing with a stepper motor , where the motor requires high ratings which cannot be provided by other interfacing devices.

  7. List of 4000-series integrated circuits - Wikipedia

    en.wikipedia.org/wiki/List_of_4000-series...

    The following is a list of CMOS 4000-series digital logic integrated circuits.In 1968, the original 4000-series was introduced by RCA.Although more recent parts are considerably faster, the 4000 devices operate over a wide power supply range (3V to 18V recommended range for "B" series) and are well suited to unregulated battery powered applications and interfacing with sensitive analogue ...

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