Circuits & Schematics: power supply - 4

31. Infrared (IR) receiver circuit minimizes power consumption
    David Lees Donald Schelle
    Circuits Microcontrollers Usage Fairchild FDN359AN FDS6679 QSE113
    .. infrared (IR) signals while conserving system power is difficult, and typically requires the inclusion of complex power-management routines in the firmware. You ...
    .. are present, it returns the circuit to standby mode by de-asserting the Hold line. The circuit draws less than 2 uA of supply current while in standby mode, and approximately 40 uA when active. The combined battery monitor and ...
    Apr 15, 2025

32. White-LED driver provides 64-step logarithmic dimming
    Will Hadden
    Circuits Supply Light Analog Devices MAX1573 MAX4480
    .. circuit of Figure 1 is designed for portable-power applications that require white LEDs with adjustable, logarithmic dimming levels. The circuit drives as many as ...
    Apr 14, 2025

33. Test technique quantifies jitter of discrete-comparator design
    Tim Davis
    Circuits Measurement Analog Devices AD8220 ADR5041 LT1634 LT3081 REF195
    .. comparator compared to an IC comparator, which was used with an ultrasound application. To set up the test, a special power-supply circuit was designed for the comparator as well as for a crystal-clock module with specified jitter. The ...
    .. colleague asked for the measured jitter number on a single-supply comparator design based on the LM359 IC ( Ref. 1 ). He wanted to know how the jitter performance of the ...
    Apr 9, 2025
34. Flip ON flop OFF without a flip/flop
    Stephen Woodward
    Circuits Supply Texas Instruments CD4069UB
    .. been a lot of interesting conversation and DI teamwork lately devising circuits for ON/OFF power control using inexpensive momentary-contact switches (See Ref. 1 Ref. 4 ). Most of these designs have ...
    Apr 7, 2025
35. Dual comparators match precision industrial, instrumentation application needs
    Tim Davis
    Circuits Analogue Design Measurement Texas Instruments LM359
    .. short propagation delays (TPD); accurate duty-cycle generation; push-pull, rail-to-rail output; and operation from a supply above 15 V. Figure 1. The schematic and text include several circuit options (current source, transistor ...
    Apr 4, 2025
36. A novel approach to creating a high-efficiency, simple buck-boost converter
    Mike Wong Tamara A. Papalias
    Circuits Supply Renesas EL7515
    .. stable voltage from an input supply that is higher and lower than the output is often required. A common solution is to use a boost converter ...
    Apr 3, 2025
37. Versatile multistep resistor load bank is simple and modular
    Vijay Deshpande
    Circuits Measurement
    .. and resistors while providing the maximum number of steps. An array or bank of load resistors is often required for testing power products, characterization of solar panels, and many other applications that require evaluation under various ...
    Apr 1, 2025
38. BJT muting switch
    Rod Elliott
    Circuits Audio Fairchild BC549 BC559
    .. turned on. Performance is far better than a FET, and unlike analogue switch ICs, you don't need to mess around with odd power supply voltages. In the off state, distortion is typically less than 0.004% and attenuation in the on state is ...
    Apr 1, 2025
39. Can a free running LMC555 VCO discharge its timing cap to zero?
    Stephen Woodward
    Circuits Analogue Design Oscillators Texas Instruments LMC555
    .. of operation, the discharge of C1 ends when the trigger input level is crossed. This normally happens at one third of the supply rail differential and one third is a long way from zero! But it turns out the 555, despite being such an old ...
    Mar 24, 2025
40. Use current-mirror biasing to avoid squegging in RF oscillators
    Madhu Siddalingaiah
    Circuits Oscillators Texas Instruments LM3046
    .. The cycle repeats at a frequency related to time constants within the bias network. Poor circuit layout or inadequate power-supply decoupling can also cause squegging. These causes are readily addressed, but the solution to the ...
    Mar 11, 2025

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