Circuits & Schematics: frequency - 9

81. Linear and switcher LED supplies combine, overcome disadvantages of each topology
    Fabien Franc
    Circuits Supply onsemi CAT4101 CAT4201
    .. especially when the supply voltage drops and approaches the LED forward voltage. In automotive applications, RFI (radio-frequency interference) is a major concern. EMI/RFI filters are recommended in front of the switching converters ...
    Dec 28, 2023

82. New full-wave precision rectifier has versatile current mode outputs
    Stephen Woodward
    Circuits Analogue Design Signal Processing, Filters Texas Instruments TLV2371
    .. quadrature signals are summed, the result is an approximate (roughly 3% nonlinearity) triangular waveshape at double the frequency of the sine, with amplitude proportional to the sine’s. Adjustment of the quasi-triangle’s ...
    Dec 22, 2023

83. Multivibrator also makes true-zero output of the op-amp
    Peter Demchenko
    Circuits Signal Processing, Filters Supply STMicroelectronics BAR43A
    .. applications. Dual Schottky BAR43A performs like a full-wave rectifier, its symmetry reduces the level of the multivibrator frequency in the output noise. The same can be said about the symmetry of the multivibrator itself. Like its ...
    Dec 19, 2023
84. Bridge measures small capacitance in presence of large strays
    Jeff Witt
    Circuits Measurement Analog Devices LT1004 LT1413 LT1462 LTC1043
    .. Two traditional circuit types have drawbacks: integrators are sensitive to noise at the comparator and voltage-to-frequency converters typically measure stray as well as sensor capacitance. The capacitance bridge presented here ...
    Dec 18, 2023
85. Single supply function generator outputs buffered squares, triangles, and sines
    Stephen Woodward
    Circuits Oscillators Texas Instruments TLV9064
    .. V DD /2) squares and triangles. The peak-to-peak amplitude of the latter is fixed by R5 and R6 at 0.909V DD , and the frequency of both is settable over two decades (and perhaps a bit more) by R1C1. Conversion of A2’s ...
    Dec 13, 2023
86. Bandpass filter has adjustable Q
    Frank Cox
    Circuits Signal Processing, Filters Analog Devices LT1228
    .. filter is defined as the ratio of the 3 dB pass bandwidth to the stop bandwidth at some specified attenuation. The center frequency of the bandpass filter in this example is 3 MHz, but this can be adjusted with appropriate LC tank ...
    Dec 12, 2023
87. Force/sense connection eliminates multiplexer on-resistance error
    Stephen Woodward
    Circuits Amplifiers Analog Devices LT1028
    .. and, therefore, the source of 100% error. The obvious approach, using larger resistors, works poorly when you need high-frequency performance. The resulting RC delay products can cause frequency peaking, ringing, and, sometimes, ...
    Dec 8, 2023
88. HV flyback converter improves efficiency
    Anil Maini Nakul Maini Varsha Agrawal
    Circuits Supply Texas Instruments LM311 LM555 VFC32BM CD4011A
    .. and transfer cycle that takes the load to its final voltage. Any attempt to design the converter using a fixed switching frequency results in poorer efficiency. In the case of higher switching frequency, energy transfer would be ...
    Dec 1, 2023
89. UVP protects rechargeable batteries
    Peter Demchenko
    Circuits Supply Diodes TL431
    .. be minimized to reduce power dissipation. For a quick charge of Q2’s gate capacitance C G during turn-on, oscillator frequency should be high (it’s about 900 kHz here). For quick turn-off, R5 should not be too high: the time ...
    Nov 30, 2023
90. Circuit forms satellite-dish command decoder
    Mark Giebler
    Circuits Signal Processing, Filters Microcontrollers Usage TV
    .. only the coaxial cable between the receiver and the dish to send commands for actions such as changing the low-noise-block frequency range or switching between dishes for multisatellite reception. The DISEqC protocol specifies a bit ...
    Nov 9, 2023

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