All Sections Fairchild - 2

11. BC309 — Datasheet Fairchild
    Datasheets Fairchild BC309
    

    PNP Epitaxial Silicon Transistor in TO-92 Package
    Aug 25, 2025
12. BC308 — Datasheet Fairchild
    Datasheets Fairchild BC308
    

    PNP Epitaxial Silicon Transistor in TO-92 Package
    Aug 25, 2025

13. BC307 — Datasheet Fairchild
    Datasheets Fairchild BC307
    

    PNP Epitaxial Silicon Transistor in TO-92 Package
    Aug 25, 2025
14. FKPF12N80 — Datasheet Fairchild
    Datasheets Fairchild FKPF12N80
    

    Bi-Directional Triode Thyristor Planar Silicon
    Aug 4, 2025
15. FKPF12N60 — Datasheet Fairchild
    Datasheets Fairchild FKPF12N60
    

    Bi-Directional Triode Thyristor Planar Silicon
    Aug 4, 2025
16. Cross connect complementary current sources to reduce self-heating error
    Stephen Woodward
    Circuits Fairchild LM317
    Lively discussions have sprung up here in editor Aalyia Shaukat’s Design Ideas regarding the limitations and quirks of, and design tricks for, the current control topologies shown in Figure 1. Figure 1. How to control amps of I OUT with mA of ...
    Jul 30, 2025
17. Current monitor
    Peter Demchenko
    Circuits Fairchild BC560
    Almost every wall power supply has no indicator showing whether current is consumed by the load or not. It seems that this was a shortcoming that was not only noticed by me: I once saw the solution given in Figure 1. Figure 1. Wall power supply ...
    Apr 24, 2025
18. KSD1691 — Datasheet Fairchild
    Datasheets Fairchild KSD1691
    NPN Epitaxial Silicon Transistor
    Apr 23, 2025
19. PWM-programmed LM317 constant current source
    Stephen Woodward
    Circuits Fairchild LM317
    LM317 fans will recognize Figure 1 as the traditional LM317 constant current source topology. It closely regulates I OUT = V ADJ /R S by forcing the OUTPUT pin to be V ADJ = 1.25 V positive relative to the ADJ pin. Thus, I OUT = V ADJ /R S to a ...
    Apr 16, 2025
20. Infrared (IR) receiver circuit minimizes power consumption
    David Lees Donald Schelle
    Circuits Fairchild FDN359AN FDS6679 QSE113
    Receiving infrared (IR) signals while conserving system power is difficult, and typically requires the inclusion of complex power-management routines in the firmware. You can avoid that problem by disconnecting power to the microcontroller when IR ...
    Apr 15, 2025

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