Circuits & Schematics: frequency - 5

41. 80 MHz VFC with prescaler and preaccumulator
    Stephen Woodward
    Circuits Measurement Analog Devices LT1027
    .. 1986, famed analog innovator Jim Williams, in “Designs for High Performance Voltage-to-Frequency Converters” ( Reference 1 ) published his 100 MHz “King Kong” VFC. If anyone’s ...
    Oct 28, 2024

42. Preaccumulator handles VFC outputs that are too fast for a naked CTP to swallow
    Stephen Woodward
    Circuits Measurement Microcontrollers Usage Texas Instruments CD74AC161
    .. conversion based on the classic combination of a voltage-to-frequency converter (VFC) with a counter has been around for (many) decades, mainly because it has some durable ...
    Oct 22, 2024

43. DC-accurate, 32-bit DAC achieves 32-bit resolution
    Stephen Woodward
    Circuits Measurement Analog Devices AD586 LTC1151
    .. nothing critical about the suggested 200-Hz PWM cycle. You need to change only R 1 and C 1 to accommodate any convenient frequency. How closely the R 1 C 1 time constant matches the PWM-cycle time determines the settling time of the A ...
    Oct 21, 2024
44. 20MHz VFC with take-back-half charge pump
    Stephen Woodward
    Circuits Measurement Texas Instruments SN74AC14 TLV9161
    .. back in 1986, famed analog innovator Jim Williams, in “Designs for High Performance Voltage-to-Frequency Converters” ( Reference 1 ) published his “King Kong” 100 MHz VFC. I have never seen ...
    Sep 30, 2024
45. Long delay timer sans large capacitors
    Jayapal Ramalingam
    Circuits Oscillators Texas Instruments LM555 CD4011B CD4017B CD4020B
    .. by 10 circuit. The equation below can be used to obtain the time delay, T, in seconds. Where F is the U1 (555) oscillator frequency in Hz. Figure 1. The above circuit produces an OFF delay of 30 minutes. The switch SW1 can be thrown on ...
    Sep 26, 2024
46. One-wire bus powers water-level sensor
    Dale Litwhiler
    Circuits Measurement Maxim DS2423
    .. the level of liquid water in a vessel such as a swimming pool. The LMC555 sensor oscillator provides an output-signal frequency that is a function of the water level. This signal drives a DS2423 pulse counter. A host PC or µC ...
    Sep 2, 2024
47. Pulse-width modulator features versatile operating parameters
    Ken Yang
    Circuits Beginners Supply Maxim MAX4094
    .. suited for a wide variety of applications. For example, low-power op amps can be used in a low-power system, and high-frequency op amps can be used for a high-frequency PWM. The circuit in Figure 1 also generates a triangular wave. ...
    Aug 1, 2024
48. Single cell V-F converter
    Jim Williams
    Circuits Analogue Design Measurement Analog Devices LT1017
    .. from C1’s 2.2 µF summing point capacitor (Trace D) via Q5 and Q2. C1 servo-controls this oscillator to whatever frequency is required to maintain C1’s summing point near zero. Since the current into C1’s input is ...
    Jul 31, 2024
49. High stability quartz stabilized V-F converter
    Jim Williams
    Circuits Measurement Analog Devices LM199 LT1001 LT1011 LT1056 LTC1043
    .. output crosses the D input’s trip point, switching again occurs and the entire process repeats. The repetition frequency depends on the input-derived current, hence the frequency of oscillation is directly related to the ...
    Jul 30, 2024
50. Measure an optocoupler's CTR
    Chee Hua How
    Circuits Measurement Analog Devices AD620 AD734
    .. in the feedback path of a switched-mode power supply. The CTR determines the DC gain of a power supply’s open-loop frequency response, which affects the loop’s phase margin. An optocoupler influences multiple operating ...
    Jul 25, 2024

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