Circuits & Schematics: frequency meter - 4

31. A two transistor sine wave oscillator
    Cor van Rij
    Circuits Oscillators
    .. 1 shows a variation on a sine wave oscillator, it uses just two transistors and a single variable resistor to set the frequency. Figure 1. Just a couple of components are needed for a simple tunable sine wave oscillator. The ...
    Jan 6, 2025

32. Ultrasonic mist maker (DIY)
    T.K. Hareendran
    Circuits Analogue Design Oscillators Texas Instruments NE555P
    .. (also called an ultrasonic atomizer), a piezo atomizer disc/transducer (ceramic humidifier) works by transposing high-frequency sound waves into mechanical energy that is transferred into a liquid, creating standing waves. As the ...
    Dec 24, 2024

33. Expanding output range of step-up converter
    Peter Demchenko
    Circuits Supply Analog Devices ADP1611
    .. the GaN FET. The cascode, shown in Figure 2 consists of an internal switch transistor and the newcomer FET; it has better frequency characteristics than the internal switch alone. So, if the newly added GaN FET also has much lower ...
    Dec 17, 2024
34. Eliminate clicks when muting single-ended audio
    Peter Demchenko
    Circuits Analogue Design Audio
    .. position, the capacitor has little effect on the signal as long as the RC time constant is long relative to signal frequency and the signal does not go above the diode’s forward voltage. Moving the switch from ...
    Dec 15, 2024
35. Temperature-sensor circuit provides dual-slope output
    Daniel Burton
    Circuits Measurement Texas Instruments LM19 LM61
    .. exhibit a positive temperature coefficient in one temperature range and negative coefficient in another. One example is the frequency drift of XT-cut crystals, which have a parabolic curve with the center frequency typically specified at ...
    Dec 9, 2024
36. Low-power PWM circuit is simple, inexpensive
    Anthony Smith
    Circuits Oscillators Supply Texas Instruments SN74HC14
    .. common technique for implementing PWM involves comparing a triangular waveform of fixed amplitude and frequency with a variable dc voltage level. Although this approach results in a PWM signal of precise frequency ...
    Nov 29, 2024
37. Pocket-size white noise generator for quickly testing circuit signal response. Part 2 - Technical implementation
    Aaron Schultz Peter Haak
    Circuits Oscillators Measurement Linear Technology LTC2063
    .. R S and a 50 nF C X to ground. This capacitor C X will interact with the LTC2063 circuit, resulting in some peaking in the frequency response. This peaking can be used to extend the flat bandwidth of the generator, in much the same way ...
    Nov 24, 2024
38. 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
39. Pocket-size white noise generator for quickly testing circuit signal response. Part 1 - Noise discussion
    Aaron Schultz Peter Haak
    Circuits Oscillators Measurement Linear Technology LTC2063
    .. the response of the design. Input sweeps can be composed of discrete input frequencies or a swept sine. Extremely low frequency sine waves (below 10 Hz) are difficult to produce cleanly. A processor, DAC, and some complex, precise ...
    Nov 19, 2024
40. RS-232 meets voltage-to-frequency converter
    Stephen Woodward
    Circuits Measurement Interfaces Texas Instruments CD4053B
    .. design idea (DI) does exactly that by using asynchronous RS-232 to power and count pulses from a simple 10-kHz voltage-to-frequency converter (VFC). Getting only one bit of info from each 10-bit serial character may seem inefficient ...
    Nov 19, 2024

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