Circuits & Schematics: Design - 8

71. A simple, accurate, and efficient charge pump voltage inverter for $1 (in singles)
    Stephen Woodward
    Circuits Supply Texas Instruments CD4053B
    .. at and below zero volts, generating symmetrical output signals, and processing bipolar analog inputs, are all examples of design situations where a few milliamps of negative voltage rail can be a necessity. Figure 1 shows a simple ...
    Jan 10, 2024

72. Squashed triangles: sines, but with teeth? Part 1
    Nick Cornford
    Circuits Oscillators Texas Instruments LM393 TL081 TLV237x
    .. exponential waves are much use for generating sines, especially when their amplitudes depend on the supply. (My original design spec was for a PP3/6LR61 battery, giving about 9 V or 4.5 V when new, and a lot less when not.) A different ...
    Jan 8, 2024

73. Soft-start controller is gentle on loads
    Douglas Sudjian
    Circuits Supply Texas Instruments LM311 TLC555
    .. Note that the signal ground with respect to earth ground is floating; you must not tie these grounds together. The design in Figure 1 has successfully controlled fans and high-amperage universal motors (100 mA to 11 A). One example ...
    Jan 1, 2024
74. Adding one resistor improves anemometer analog linearity to better than ±0.5%
    Stephen Woodward
    Circuits Analogue Design Measurement Texas Instruments LM10 LMC555 2N5089
    .. back I published a simple design idea for a thermal airspeed sensor based on a self-heated Darlington transistor pair ( Ref. 1 ). See Figure ...
    Dec 29, 2023
75. Linear and switcher LED supplies combine, overcome disadvantages of each topology
    Fabien Franc
    Circuits Supply onsemi CAT4101 CAT4201
    .. 3 V, the linear driver takes over. Note that if the other half of the LM393 is not used for another LED power supply, good design practice dictates that all unused input and output pins on the LM393 be tied to ground. Figure 2 shows the ...
    Dec 28, 2023
76. RFL-class logic gates
    Thomas Scarborough
    Circuits Digital Microchip 2N7000
    .. Design Idea describes a new class of logic gates, which we have named resistor-FET-logic, aka “RFL.” How ...
    Dec 25, 2023
77. New full-wave precision rectifier has versatile current mode outputs
    Stephen Woodward
    Circuits Analogue Design Signal Processing, Filters Texas Instruments TLV2371
    .. dubious) advantages compared to competing topologies. This “new” (I haven’t seen it elsewhere) idea for a design shown in Figure 1 joins the mob with the following claims to fame. It requires only a single amplifier, runs ...
    Dec 22, 2023
78. Multivibrator also makes true-zero output of the op-amp
    Peter Demchenko
    Circuits Signal Processing, Filters Supply STMicroelectronics BAR43A
    .. zero output of an op-amp that is based on a symmetrical multivibrator for better efficiency than the previous photocell design idea. This second circuit is based on a symmetrical multivibrator and has far better efficiency than its ...
    Dec 19, 2023
79. Single supply function generator outputs buffered squares, triangles, and sines
    Stephen Woodward
    Circuits Oscillators Texas Instruments TLV9064
    .. of square, triangle, and sine waveform outputs is a familiar tool on electronics lab benches. It’s also a classical design exercise. Generally, the square and triangle are easy, so the problem is how to generate an acceptably ...
    Dec 13, 2023
80. Force/sense connection eliminates multiplexer on-resistance error
    Stephen Woodward
    Circuits Amplifiers Analog Devices LT1028
    .. controlled gain is an everyday analog-design element. You frequently find this element in an op-amp-based, transimpedance current-to-voltage converter. ...
    Dec 8, 2023

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