Circuits & Schematics: meter - 2

11. Circuit lets you measure zener voltages and test LEDs
    Circuits Measurement Diodes ZXLD381
    .. Figure 2 shows. Figure 2. An LED driver provides current for the LED under test. When S 2 is in the upper position, the meter measures voltage across R 1 , a 1-kΩ resistor; the meter displays a negative-voltage-drop value. R 1 ...
    30-11-2022

12. Simple diode serves as a sensor for a thermal probe
    Circuits Measurement Semelab BC177
    .. thermal problems by simply probing a suspicious component with the sensing diode. The circuit, including the indicating meter, can fit into a small housing, such as an empty 20 g glue-stick tube. An ordinary 1N4148 silicon signal diode ...
    21-11-2022

13. Use a heated diode as a flow sensor
    Circuits Measurement Texas Instruments LM393
    .. more precision adjustment is possible. Perhaps 5 V for LM393 is not required; ground would do in this case. b) The wind meter works on the same principle as a hot-wire anemometer. The simple wind meter (Figure 2b) operates on the same ...
    11-11-2022
14. Inductor-Based Astable 555 Timer Circuit
    Circuits Oscillators Texas Instruments LM555CN
    .. 51.96 3.17 Figure 2. R S of the inductor. To test these ideas, I picked the components listed in Table 2 and used an LCR meter to measure their actual characteristics (Figure 2). I plugged the values into the spreadsheet to predict T H , ...
    06-10-2022
15. Magnetic-Field Probe Requires Few Components
    Circuits Measurement Allegro A1323
    .. to feed a 5 V regulator IC, such as a 7805 voltmeter and add an on/off switch if desired. Place the batteries near the meter. Otherwise, the batteries' steel cases will disturb the magnetic field under observation. Use 10-nF SMD ...
    09-06-2022
16. Volume-Unit Meter Spans 60-dB Dynamic Range
    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 ...
    24-05-2022
17. Sub-picofarad measurement with CMOS inverters
    Circuits Measurement Texas Instruments CD4069UB
    .. Idea illustrates this by using all six inverters in a 4069 package to make a closed loop, duty-cycle-based capacitance meter with a full scale deflection below one picofarad. The inverters exhibit stable output with a direct feedback ...
    09-03-2022
18. Moving-coil meter measures low-level currents
    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 ...
    23-10-2021
19. MOSFET enhances low-current measurements using moving-coil meter
    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 ...
    20-10-2021
20. Measure inductance & capacitance over a wide range
    Circuits Measurement Texas Instruments CD74HC14 LM78L05
    .. the resulting voltage, averaged by C2 and C3, is measured by an external voltmeter. Figure 2. Complete schematic of C and L meter. Transients with an exponential decay that extend over a particular portion of the square wave period will ...
    20-09-2021

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