Circuits & Schematics: frequency meter - 9

81. Generator has Independent Pulse Width, Frequency
    Circuits Oscillators Texas Instruments LM555
    .. the desired square wave is to use the inexpensive 555 timer. The need sometimes arises for a square wave with fixed frequency but variable pulse width or vice versa. It's difficult to satisfy these requirements with a ...
    Apr 20, 2020

82. Analogue charge pump produces high-frequency, high-voltage pulses
    Gavin Watkins
    Circuits High Voltage Oscillators Texas Instruments LM6171
    A recent project evaluated the feasibility of a dynamic load modulation (DLM) RF power amplifier for 5G. DLM amplifiers typically use high-voltage varactor diodes in their output network, which need to be driven by high-speed large linear voltage ...
    Aug 27, 2020

83. DIY Low Frequency Generator - Op-Amp Tester
    Валерий Бабанин
    Circuits Oscillators Measurement Amplifiers GL5506
    .. with 10-15% tolerance. Timing capacitors C1-C2 are installed in the header socket (Figure 3), allowing almost the full frequency range of the op amp to be tested if necessary. The capacitors pairs to cover the range of 14 Hz-140 kHz ...
    Nov 20, 2024
84. Frequency source feeds entire lab
    Mitchell Lee
    Circuits Oscillators Measurement Analog Devices LT6551
    .. a laboratory with a standard frequency makes a lot of sense if the lab uses multiple frequency counters, spectrum analyzers, and other ...
    Dec 14, 2020
85. Square-wave modulator has variable frequency and pulse width
    Circuits Oscillators Texas Instruments SN74LS123
    .. in Figure 1 satisfies all these criteria. The circuit delivers a unipolar (adjustable from 0 to 12 V) pulse with adjustable frequency and pulse width. The first half of a dual, retriggerable monostable multivibrator, IC 1A , generates ...
    Jan 13, 2021
86. Improved frequency modulator uses «negatron»
    Alexander Bell
    Circuits Wireless Measurement Analog Devices LT1124
    .. bias resistor R 4 , because of single-supply operation). The negatron portion of the circuit uses op amp IC 2 . The output frequency, f, of the modulator without the negatron is a function of the time constant Figure 1. The modulator ...
    Jan 28, 2021
87. Frequency Comparator has Status Output
    Susanne Nell
    Circuits Measurement NXP 74HC4046AD
    .. an engine with only one LED as an indicator. The measurement of the number of revolutions usually involves sensors with a frequency output proportional to the number of revolutions. The circuit compares the frequency output of such a ...
    Apr 20, 2021
88. Frequency doubler operates on triangle wave
    Circuits Analogue Design Texas Instruments TLC2272
    Frequency multipliers typically work with square waves. However, the circuit in Figure 1 performs frequency ...
    May 18, 2021
89. Triangle Waves Drive Simple Frequency Doubler
    Jim McLucas
    Circuits Oscillators Vishay 1N914 SD101
    .. you use a function generator, you may occasionally require a sine-wave output at a higher frequency than the generator can provide. If your function generator also produces a triangle-wave output, you ...
    May 26, 2021
90. Build A High-Frequency Portable Spectrum Analyzer Using Two Filter ICs
    Circuits Measurement MSI MSLSA MSMXVHF
    .. This can be achieved, for example, by using an IC such as Mixed Signal Integration’s Mixed Signal MiXer and Very High frequency Filter ( MSMXVHF ) to baseband, while the Mixed Signal Low powered Spectrum Analyzer (MSLSA) provides ...
    Jun 29, 2021

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