Circuits & Schematics: Design - 8

71. Classic 3-leg adjustable regulators have a shunt mode? Who knew?
    Circuits Supply Fairchild LM317
    .. therefore rise to 0 V, and the internal regulator control amplifier to turn on the internal Darlington pass device. These design equations will then apply: Let V REF 1.25, e.g., 5 When V SET is attained, U1 transitions to a very ...
    24-07-2023

72. Light a white LED from half a cell
    Circuits Supply Light Texas Instruments SN74AUC1G14
    .. forward voltages typically ranging from 3 to 5 V, operating them from a single cell presents obvious difficulties. This design exploits the ultralow operating voltage of a single-gate Schmitt inverter, such as the SN74AUC1G14 or the ...
    20-07-2023

73. LED driver delivers constant luminosity
    Circuits Supply Light
    .. circuit in Figure 1 is similar in principle to that of a previous Design Idea ( Reference 1 ) but offers improved, more reproducible performance. The output current is almost ...
    19-07-2023
74. Circuit converts DAC's outputs from single-ended to differential mode
    Circuits Signal Processing, Filters Analog Devices AD5424 AD8042
    .. a positive common-mode voltage, you use a negative voltage for the DAC's reference voltage. The DAC's internal design accommodates ac reference input signals of 10 to +10 V. In this mode, the DAC provides a 5M-sample/sec ...
    13-07-2023
75. Simple dc/dc converter increases available power in dual-voltage system
    Circuits Supply Linear Technology LT1946
    .. sources at 5 V, 300 mA (1.5 W) and 5 V, 300 mA (1.5 W). Because the input uses different-polarity voltage sources, the design uses a flyback dc/dc converter to avoid a system-grounding problem. Level-shifted feedback sensing using a ...
    12-07-2023
76. How to recover a pulse signal with a large capacitance load
    Circuits Signal Processing, Filters Digital Texas Instruments OPA365 SN7407 TLV3501
    .. signals and negatively for decreasing signals. Figure 3. Differentiator and comparator used for pulse reconstruction. The design in Figure 3 uses a differentiator. Figure 3 also shows the simple gate solution (IC 2 ) for comparison. In ...
    10-07-2023
77. 300 volt, 4 second, self-calibrating Shannon decoder DAC
    Circuits High Voltage Measurement Microchip LM4040
    .. time. Of course, whether “nT” is really fast really depends on how long T really is! Figure 1 presents an SD design in which T = 500 ms (!), making an 8 bit conversion require nT = 8 × 0.5 = 4 seconds! In what ...
    06-07-2023
78. Self-heated ∆Vbe transistor thermostat needs no calibration
    Circuits Analogue Design Measurement Texas Instruments CD4053B TLV2374-Q1
    .. large and energy intensive, so they’re tricky to fit into miniature, power-efficient designs. The thermostat design presented (Figure 1) here can’t eliminate these problems, but it minimizes both. Figure 1. The ...
    04-07-2023
79. Complementary-pair dc/dc converter simultaneously doubles, inverts supply voltage
    Circuits Supply ON Semiconductor BCP56 MBRS1100
    .. circuit in this Design Idea uses an intrinsic property of collector voltages in one-transformer pushpull dc/dc converters: They have ...
    29-06-2023
80. Circuit extends battery life
    Circuits Supply
    .. previous Design Ideas describe simple ways to automatically disconnect a battery from its load after a preset on period, ...
    08-06-2023

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