Circuits & Schematics: meter - 3

21. A 4- to 20-mA loop needs no external power source
    Circuits Measurement Maxim MAX4073H
    .. current loop. The output of the amplifier is linear from 350 to 1950 mV for 4 to 20 mA through the loop. The measurement meter at the output must not draw more than 5 µA from the output for 1% full-scale measurement accuracy. The ...
    03-08-2021

22. Digitize Thermocouple Output Near Sensing Point
    Circuits Measurement Maxim MAX6674 MAX6675
    .. by a small slab of material with high thermal conductivity. Copper, whose thermal conductivity is 394 W/mK (watts per meter-degree Kelvin), is the ideal material. The input connections must be electrically isolated, but thermally ...
    07-04-2021

23. Indicator features expanded scale
    Circuits Analogue Design Measurement
    .. and estimating its average value after the process reaches steady state (Figure 1). In this situation, using an analog meter with marked red and green zones is preferable to using a digital or bar-graph LED display. Figure 1. It’s ...
    26-10-2020
24. Make a truly linear RF-power detector
    Circuits Analogue Design Measurement Analog Devices AD633 AD707 AD8361
    .. output voltage that is proportional to the input power level in watts. You can easily adjust gain and offset for this power meter with an op-amp circuit, thus providing an output scaled in volts per watt. A complex RF waveform feeds the ...
    13-09-2020
25. 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 ...
    18-06-2020
26. 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 ...
    24-04-2020
27. DIY Ultra Sensitive EMF Detector
    Circuits Arduino Measurement Beginners Microcontrollers Usage
    .. 2). Figure 2. Ultra Sensitive EMF Detector Schematic Diagram. The code is a combination of two parts (Arduino based VU meter by KTAudio for LCD display part, and Aaron ALAI EMF Detector for sensor part) and also modifications to certain ...
    18-04-2020
28. Self-Calibrating USB Voltage/Current Meter
    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 ...
    26-03-2020
29. Transform Audio/Visual Receiver into Adjustable 3-Phase Power Supply
    Circuits Audio Supply STMicroelectronics MC1458
    .. the all-phase filter, and the phase shift is adjustable to 60 degrees by the R8, a 10-kΩ potentiometer. If a phase meter isn’t available, a simple procedure can be used to adjust the phase shift. First, measure the voltage ...
    25-03-2020
30. Power meter uses low-cost multiplier
    Circuits Analogue Design Measurement Texas Instruments LM3812 LF412
    .. Kotowski EDN A power-meter circuit typically requires either an analog or a digital multiplying circuit. These circuits can be complex, ...
    18-04-2019

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