Circuits & Schematics Light: led - 2

11. Astable multivibrator lights LED from a single cell
    Circuits Supply Light Fairchild BC550C
    .. 1.5 V cell poses a problem because their forward voltages are higher than the cell’s. The simplest way to light the LED is to use a step-up dc/dc converter. This Design Idea offers a simple and reliable alternative for applications in ...
    23-12-2022

12. Switching regulator efficiently controls white-LED current
    Circuits Supply Light Texas Instruments LM2852
    .. mA. Today's white LEDs deliver more light and thus must operate at ever-higher bias currents. Maintaining control of an LED's bias point while operating at high current near its maximum rating requires a new approach. The simplest and ...
    18-05-2022

13. White-LED driver operates down to 1.2V supply voltage
    Circuits Supply Light Maxim MAX1595
    .. LED drivers, using both charge pumps and inductors, are available to boost the 1.2 to 2.4 V available from single- and ...
    18-04-2022
14. Use LEDs as photodiodes
    Circuits Automation Measurement Light Texas Instruments CD4011B
    .. simple circuit in Figure 1, which can be powered with a 3.6 V nickel-cadmium rechargeable battery, lets you use an LED to detect light. The circuit consumes practically no quiescent power. Two LEDs act as photodiodes to detect and ...
    08-03-2022
15. Circuit Drives Mixed Types and Quantities of LEDs
    Circuits Supply Light Maxim MAX1698 MAX4040
    .. of dissimilar LEDs from the same source, you can regulate the current through multiple strings. Four strings of varying LED types derive power from a single power source (Figure 1). The circuit mixes LEDs of different forward-bias ...
    09-02-2022
16. Switch circuit controls lights
    Circuits Automation Light Texas Instruments LM397
    .. and towns worldwide are considering and installing LED streetlights to help save electric energy, reduce costs, protect the environment, and improve lighting for their ...
    28-10-2021
17. LED driver doubles as fault monitor
    Circuits Supply Light
    .. find wide use as indicators and as light emitters in devices such as optocouplers. In some applications, the LED or the emitter may be located remotely at some distance from the main unit. Typical examples are dashboard-mounted ...
    19-07-2021
18. Circuit controls intensity of reflex optical sights
    Circuits Automation Games Light Fairchild L14Q1
    .. as astronomy, archery, and shooting. In the reflex sight, light from an internal source typically a high-intensity red LED reflects from a curved, transparent optical (reflex) element through which you view the target. The result of this ...
    03-03-2021
19. Voltage-to-Current Converter Drives White LEDs
    Circuits Supply Light Fairchild BC548C BC558C
    .. sometimes need to drive a white LED from one 1.5 V battery. Unfortunately, the forward voltage of a white LED is 3 to 4 V. So, you would need a dc/dc ...
    12-02-2021
20. Scheme provides high-side current sensing for white-LED drivers
    Circuits Supply Light Sipex SP6690
    .. phones, PDAs, and MP3 players. Multiple LEDs often connect in series to ensure that the same current flows through every LED. To forward-bias these LEDs, a voltage of 10 to 16 V comes from an inductor-based boost regulator, such as an ...
    25-11-2020

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