Circuits & Schematics: frequency meter - 5

41. A fully analog electronic dice
    Patrick Van Torre
    Circuits Analogue Design Games Texas Instruments LM324 TLV2374
    .. single supply voltage, setting the bias halfway that of the supply voltage with voltage divider R3 and R8. The oscillation frequency is chosen by means of C1 and R1. The output of the oscillator is a symmetric square wave. The role of ...
    Nov 15, 2024

42. 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

43. 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
44. 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
45. 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
46. Electromechanical damping stabilizes analog-meter readings
    Alexander Bell
    Circuits Analogue Design Measurement
    .. This Design Idea applies essentially the same principle to analog meters under normal operating conditions. Connecting a meter to a voltage source with low internal resistance applies electromagnetic damping and makes the meter's ...
    Sep 30, 2024
47. 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
48. Mighty 555 and ESR-meter
    Peter Demchenko
    Circuits Measurement STMicroelectronics TS555
    Let’s see how you can effectively double the output sink current of the plain old 555 timer. From the block diagram in Figure 1 taken from the datasheet of the ST’s TS555 low power single CMOS timer) we can see that the Discharge pin ...
    Sep 17, 2024
49. 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
50. 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

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