All Sections Fairchild - 3

21. QSE114 — Datasheet Fairchild
    Datasheets Fairchild QSE114
    Plastic Silicon Infrared Phototransistor The QSE113/114 is a silicon phototransistor encapsulated in a wide angle, infrared transparent, black plastic sidelooker package.
    Apr 15, 2025
22. QSE113 — Datasheet Fairchild
    Datasheets Fairchild QSE113
    Plastic Silicon Infrared Phototransistor The QSE113/114 is a silicon phototransistor encapsulated in a wide angle, infrared transparent, black plastic sidelooker package.
    Apr 15, 2025

23. BJT muting switch
    Rod Elliott
    Circuits Fairchild BC549 BC559
    Introduction In general, muting and/or signal switching is done by relays, FETs or CMOS analogue switch ICs. All have limitations, but a little known technique that really doesn't look like it could ever work is to use bipolar transistors. The ...
    Apr 1, 2025
24. Tracking preregulator boosts efficiency of PWM power DAC
    Stephen Woodward
    Circuits Fairchild LM317 2N3906
    This design idea revisits another: “PWM power DAC incorporates an LM317” ( Ref. 1 ). Like the earlier circuit, this one implements a power DAC by integrating an LM317 positive regulator into a mostly passive PWM topology. It exploits ...
    Feb 17, 2025
25. FDC604P — Datasheet Fairchild
    Datasheets Fairchild FDC604P
    P-Channel 1.8V Specified PowerTrench MOSFET This P-Channel 1.8V specified MOSFET uses Fairchild’s low voltage PowerTrench process. It has been optimized for battery power management applications.
    Feb 11, 2025
26. PWM power DAC incorporates an LM317
    Stephen Woodward
    Circuits Fairchild LM317
    Instead of the conventional approach of backing up a DAC with an amplifier to boost output, this design idea charts a less traveled by path to power. It integrates an LM317 positive regulator with a simple 8-bit PWM DAC topology to obtain a robust ...
    Jan 14, 2025
27. Simple circuit tests twisted-pair cables
    Mark D Braunstein
    Circuits Fairchild LM317T
    Using the system shown in Fig. 1, you can quickly test a cable containing twisted-wire pairs and detect open or reversed pairs, shorted pairs, and shorts between unrelated pairs. The tester consists of an active test set that plugs into one end of ...
    Nov 11, 2024
28. MM74C928 — Datasheet Fairchild
    Datasheets Fairchild MM74C928
    4-Digit Counters with Multiplexed 7-Segment Output Drivers The MM74C925, MM74C926, MM74C927 and MM74C928 CMOS counters consist of a 4-digit counter, an internal out- put latch, NPN output sourcing drivers for a 7-segment dis- play, and an internal ...
    Oct 10, 2024
29. MM74C927 — Datasheet Fairchild
    Datasheets Fairchild MM74C927
    4-Digit Counters with Multiplexed 7-Segment Output Drivers The MM74C925, MM74C926, MM74C927 and MM74C928 CMOS counters consist of a 4-digit counter, an internal out- put latch, NPN output sourcing drivers for a 7-segment dis- play, and an internal ...
    Oct 10, 2024
30. MM74C926 — Datasheet Fairchild
    Datasheets Fairchild MM74C926
    4-Digit Counters with Multiplexed 7-Segment Output Drivers The MM74C925, MM74C926, MM74C927 and MM74C928 CMOS counters consist of a 4-digit counter, an internal out- put latch, NPN output sourcing drivers for a 7-segment dis- play, and an internal ...
    Oct 10, 2024

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