Circuits & Schematics: meter - 4

31. 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

32. 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

33. 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
34. 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
35. 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
36. 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
37. 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
38. Create radio receiver circuits with the LM386 audio amplifier
    Circuits Radio Texas Instruments LM386
    .. When constructed with a LM386 manufactured by either National Semi or Samsung, this configuration can receive both the 80 meter and 40 meter amateur bands up to 8 MHz. Figure 5. The LM386 can be used to create a shortwave regenerative ...
    Jun 18, 2020
39. A brief overview of Allegro ACS712 current sensor. Part 2 - Interface the sensor with a PIC microcontroller
    Circuits Measurement Microcontrollers Usage Allegro ACS712
    .. device were briefly discussed. Now we will use that theory to implement the ACS712 sensor to make a simple DC current meter. The analog output voltage from the sensor is measured through an ADC channel of the PIC16F1847 ...
    Nov 10, 2012
40. Infra Red Remote Control Extender
    Circuits Domestic TV CA3140
    .. exposed to infra red radiation. This current (around 1uA with the SFH2030 and a typical IR control used at a distance of 1 meter) is amplified by the CA3140 opamp. This is configured as a differential amplifier and will produce an output of ...
    Oct 27, 2007

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