Circuits & Schematics: frequency meter - 6

51. Self-Calibrating USB Voltage/Current Meter
    Tirdad Sadri Nejad
    Circuits Measurement Microcontrollers Usage Microchip ATtiny13A
    .. one? If you can do it better, then do it. So what's better about my design (Figure 1)? Figure 1. USB Voltage/Current Meter measures voltages up to 22 volts and current up to 5 amps. The USB Voltage/Current meter has the following ...
    Mar 26, 2020

52. Arduino based Milliohm Meter with LCD display
    Circuits Arduino Measurement MCP3422 LT3092 ULN2003
    .. battery testers. For today’s tutorial, we will add another tool to the list by examining the development of a Miliohm meter (Figure 1). Figure 1. Arduino based Milliohm Meter with LCD display. A milliohm meter is a device used in ...
    Apr 24, 2020

53. Moving-coil meter measures low-level currents
    Kevin Bilke
    Circuits Measurement Maxim MAX4172 MAX495
    .. an analog moving-coil meter may lack the resolution and accuracy that a digital readout provides, a meter remains the display of choice for ...
    Oct 23, 2021
54. MOSFET enhances low-current measurements using moving-coil meter
    Stefan Strózecki
    Circuits Measurement Maxim MAX4172 MAX495
    .. previous Design Idea describes an interesting and useful method for using a moving-coil analog meter to measure currents in the less-than-1A range ( Reference 1 ). The design offers considerable flexibility in ...
    Oct 20, 2021
55. Volume-Unit Meter Spans 60-dB Dynamic Range
    Jon Munson
    Circuits Audio Measurement Analog Devices LT1011 LT1469
    .. audio volume-unit meter displays peak-related audio amplitudes to aid in accurately setting recording levels or for displaying an ...
    May 24, 2022
56. Simple log-scale audio meter
    Nick Cornford
    Circuits Audio Measurement Texas Instruments TL081
    .. diode-drops’-worth in the process. (No, the V F s don’t match exactly, except momentarily, but no matter.) The meter now shows the log of negative-input half-cycle peaks, the needle falling back as the capacitor discharges ...
    Jan 22, 2024
57. Supersized log-scale audio meter
    Nick Cornford
    Circuits Audio Measurement Texas Instruments TL084 LM385
    .. the end of the DI for a Simple log-scale audio meter (Ref. 1), I promised to show how to upgrade it to work better. With these fixes, it now has near-digital ...
    Mar 21, 2024
58. 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
59. 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
60. 3.5GHZ Frequency Counter
    Circuits Measurement Microcontrollers Usage
    .. Frequency counter is a very important test instrument for Radio Amateurs, especially those who wish to develop or ...
    Jul 15, 2010

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