Circuits & Schematics: frequency meter - 4

31. Circuit's RMS output is linearly proportional to temperature over wide range
    Circuits Measurement Analog Devices LT1001
    .. between V 1 and V 2 and therefore has an inherent dc level that can filtered using a simple RC-network with a low cut-off frequency, e.g., 2 Hz if needed. Filtering guarantees square-wave output with negligible peak level attenuation ...
    03-10-2023

32. Handheld electric PCB drill speed controller
    Circuits Tools and Technologies Microcontrollers Usage Infineon IRL520N
    .. and only uses a few components. Basically, it is an Arduino Uno based PWM controller that operates at a relatively high frequency (Figure 1). It features almost 0-100% DC motor speed regulation while retaining the pulse width ...
    28-09-2023

33. AC-coupling instrumentation amplifier improves rejection range of differential dc input voltage
    Circuits Analogue Design Amplifiers Analog Devices LT1464
    .. comprising IC 4 , R FB , and C FB , in a classic three-op-amp instrumentation amplifier. This feedback loop produces a frequency-dependent transfer function: Consequently, the ac-coupled instrumentation amplifier behaves as a ...
    27-09-2023
34. Single cell flashes white LED
    Circuits Supply Light
    .. forward-current gain of Q 5 ; and the forward voltage of LED 1 . With the component values in the figure, the oscillation frequency is typically 50 to 200 kHz. On each cycle, a pulse of current with a peak value equal to I LPEAK flows ...
    26-09-2023
35. Single switch controls digital potentiometer
    Circuits Analogue Design Interfaces Digital Texas Instruments SN74HC132
    .. the rocker switch, the clock generates one pulse. If you continuously depress the rocker switch, the clock free-runs at a frequency of approximately 1/R 1 C 1 . Materials on the topic Datasheet ON Semiconductor CAT5114 Datasheet Texas ...
    21-09-2023
36. 1 kHz per degree Kelvin temperature sensor
    Circuits Analogue Design Measurement Fairchild 2N3904
    .. C1 could be increased seemingly without limit, without decreasing oscillation amplitude one iota. Oscillation frequency decreased (inversely proportional to C1), but oscillation amplitude remained stubbornly unattenuated. ...
    08-09-2023
37. Flip-flop plus choke comprise simple and cheap inductive sensor
    Circuits Measurement Fairchild 2N3904
    .. of an inductor integrated into an oscillator, so that entry of metal into the magnetic field of the inductor changes the frequency of oscillation. Figure 1 shows a particularly simple and cheap example that produces a ~100 kHz ...
    06-09-2023
38. 1-IC design monitors ajar doors
    Circuits Automation Beginners Texas Instruments CD4011B
    .. door remains closed, the switch is closed and the alarm is disarmed. Figure 1. If the door and its switch are open, the low-frequency oscillator (C and D) pulses the transducer's 3-kHz driver ON and OFF. Opening the door in turn ...
    06-09-2023
39. Use a DAC to vary LVDT excitation
    Circuits Oscillators Measurement Analog Devices AD712 AD7564BR
    .. the position of a magnetic core into electrical signals. The excitation typically ranges in amplitude from 1 to 10 V and in frequency from 1 to 10 kHz, depending on the type of LVDT you employ. Traditionally, for one circuit to provide ...
    31-08-2023
40. 5V powered, 0.0015% linearity, quartz-stabilized V-F converter
    Circuits Measurement Analog Devices LT1461 LT1671 LT1884 LTC1043
    .. all precision voltage-to-frequency converters (V-F) utilize charge pump based feedback for stability. These schemes rely on a capacitor ...
    29-08-2023

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