Circuits & Schematics: frequency meter - 7

61. Frequency dithering enhances high-performance ADCs
    Steve Hageman
    Circuits Linear Technology LTC1799
    .. Even briefly saturating the A/D converter adds more nonlinearities than dither can remove. Another approach adds a dithered-frequency, constant-amplitude signal. Figure 1 shows one possible implementation featuring a Linear LTC1799 ...
    Jun 5, 2018

62. Turn DDS Chip Into Low-Frequency Arbitrary Signal Generator
    Circuits Measurement AD9833
    .. Munoz In a prior research project in the communications field, we created a portable, low-frequency (0 to 1 MHz) signal generator design. This generator had a broad output voltage range (0 to 100 Vp-p) ...
    Apr 6, 2011

63. 2-Wire Keypad Interface Using a 555 Timer. Part 2 Frequency and Pulse outputs, Significance of Rp and Cp values, Role of Rc resistor
    Circuits Microcontrollers Usage
    .. 1. Theory and Schematic Frequency and Pulse outputs Click to enlarge There are two outputs in this circuit. One is the frequency output ...
    Apr 18, 2011
64. Simple Generator Provides Very-Low-Frequency/Distortion Sine and Square Waves
    Jim Tonne
    Circuits Analogue Design Oscillators Linear Technology LTC6244HV
    .. with a low-pass phase-shift network configuration rather than the more-common high-pass network. Figure 1. This very-low-frequency sine- and square-wave generator requires few components, but provides low-distortion outputs (derived ...
    Apr 2, 2018
65. Simple sawtooth generator operates at high frequency
    Luca Bruno
    Circuits Oscillators Measurement
    .. use in low-power applications operating at frequencies as high as 10 MHz and beyond and those in which ramp linearity and frequency accuracy are not prominent concerns. Figure 1. You can use the C T ramp’s charge and fast ...
    Oct 2, 2012
66. Linearize optical distance sensors with a voltage-to-frequency converter
    Jordan Dimitrov
    Circuits Automation Measurement Microcontrollers Usage
    .. the mathematical inverse of an analog voltage by converting it to frequency and measuring the period. A popular series of inexpensive distance sensors integrates an infrared ...
    Feb 10, 2013
67. Dramatically increase the frequency range of RC-based voltage-controlled oscillators
    Circuits Analogue Design
    .. Stafford, Pittsburgh, PA EDN A typical voltage-to-frequency converter also known as a VCO (voltage-controlled oscillator) IC has a simple linear tuning ...
    Mar 27, 2013
68. NE555 timer sparks low-cost voltage-to-frequency converter
    Gyula Diószegi János Nagy
    Circuits Analogue Design Measurement Philips NE555 TL071
    .. producing more than 1 billion of them a year. By adding a few components to the NE555, you can build a simple voltage-to-frequency converter for less than 50 cents. The circuit contains a Miller integrator based on a TL071 along with ...
    Sep 24, 2015
69. Build an adjustable high-frequency notch filter
    Circuits Analogue Design Texas Instruments TLC082
    .. 1. An op amp and a switched-capacitor filter combine to form a highly selective notch filter. Figure 2. This plot is the frequency response of the third-order lowpass-filter stage. You set the passband ripple at approximately 5 dB to ...
    Jun 9, 2017
70. Double µC's PWM Frequency & Resolution
    Alperen Akküncü
    Circuits Microcontrollers Usage Texas Instruments MSP430FR5969
    .. only the LF or DC component that is proportional to duty cycle. However, the low-pass filter can’t filter out the PWM frequency completely, and for that reason, the LF/DC signal will generally have some ripple. There are two ...
    Oct 20, 2017

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