Circuits & Schematics: Design - 6

51. 3-leg regulator in shunt mode makes variable power supply symmetrical
    Circuits Supply Fairchild LM317
    .. if allowed to persist, but U1 subtracts a matching 2.5 V and thereby fixes it. If you’re considering using this design, please be aware it assumes that current drawn from the positive output will be always at least as great as ...
    30-10-2023

52. Low-cost digital DAC provides digital three-phase-waveform synthesis
    Circuits Oscillators NXP UDA1330ATS
    .. sampling frequencies of 8 to 55 kHz. These features make the DACs attractive for three-phase DDS with few components. This Design Idea implements DDS techniques using an ARM microcontroller, IC 1 ; one stereo-DAC, IC 2 ; and one op amp, IC ...
    27-10-2023

53. Temperature controller has "take-back-half" convergence algorithm
    Circuits Automation Analogue Design Texas Instruments CD4053B LMC6484
    .. the problem by adopting a better estimate of H whenever the system's temperature crosses the setpoint, T = T S ). This Design Idea outlines a TBH (take-back-half) method that takes deliberate advantage of the approximate equality of ...
    26-10-2023
54. Momentary switch controls mains with latch-on and remote shutdown
    Circuits Supply Nexperia 1N4448
    .. purpose of this Design Idea was to improve reliability, add new features, and replace a latching power switch with a momentary one. ...
    25-10-2023
55. Low-cost precision adjustable current reference and application
    Circuits Measurement Supply Microchip LM4040
    .. with either and a current reference would often be the better fit. The current reference idea presented here is a simple design for both a current source and current sink that offers good versatility and performance at a budget price. ...
    19-10-2023
56. Single switch controls digital potentiometer
    Circuits Interfaces Digital ON Semiconductor CAT5114
    .. Design Idea is an evolution and simplification of another (Figure 1, Reference 1 ). Replacing the three ...
    10-10-2023
57. A 50 MHz 50:50-square wave output frequency doubler/quadrupler
    Circuits Signal Processing, Filters Texas Instruments SN74AC86 SN74AC74 TLV2374
    .. and, as the name implies, divide daytime into nominally equal intervals of sunlight and night. Author of multiple EDN design ideas, Jim McLucas (Mr. Equinox) evidently has a passion and a talent for devising circuits that also divide ...
    10-10-2023
58. Dual op amp takes absolute difference
    Circuits Analogue Design Signal Processing, Filters Texas Instruments LM2902
    .. a difference circuit followed by an absolute-value circuit; the entire circuit requires at least three op amps. The design problem is complicated in single-supply-only systems, which usually require an artificial ground, typically ...
    05-10-2023
59. Circuit's RMS output is linearly proportional to temperature over wide range
    Circuits Measurement Analog Devices LT1001
    .. amplifier conditioning circuit for direct readout. Output calibration is achieved using a voltage reference. In this design idea the concept of the p-n diode driven at constant current is extrapolated, potentially eliminating voltage ...
    03-10-2023
60. An LED display adapted for DIY projects
    Circuits Microcontrollers Usage Digital Texas Instruments CD74HC137 CD74HC259
    .. a microcontroller in Figure 1 has a simple interface with only 6 data/control wires and can be easily accommodated to a DIY design. The display has static indication. Figure 1. The expandable LED display for a microcontroller has a ...
    14-09-2023

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