Circuits & Schematics: meter

1. A simple circuit to let you characterize JFETs more accurately
   Cor van Rij
   Circuits Analogue Design Measurement Texas Instruments TL071A
   .. was that the output voltage range for both measurements needed to be the same: 0 5 V. This was so that a moving coil meter readout could be used with a single range. See Figure 4 for the implementation. Figure 4. A circuit with the ...
   May 15, 2025

2. Metal detector uses single IC
   Rachel Hageman Steve Hageman
   Circuits Measurement National Semiconductor LM389
   .. because they will lock with each other, thereby reducing the search oscillator’s sensitivity. You can add a meter output for visual or automatic control by adding a highpass filter to the LM389’s output. This highpass ...
   Feb 5, 2025

3. 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
4. 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
5. 85V-260VAC to 5VDC-2.5A flyback switching power supply
   Hesam Moshiri
   Circuits Supply Dongke Semiconductor DK1203
   .. a gap accurately and winding the transformer by hand and without any error is difficult. The easy solution is to use an LCR meter! first, wind the primary and assemble the transformer (without any gap). Then measure the inductance of the ...
   May 7, 2024
6. 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
7. 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
8. Battery internal resistance meter
   Jim Williams
   Circuits Measurement Supply Analog Devices LT1077 LTC1150 LTC1798 LTC6943
   It is often desirable to determine a battery’s internal resistance to evaluate its condition or suitability for an application. Accurate battery resistance determination is complicated by inherent capacitive terms which corrupt results taken ...
   Jun 22, 2023
9. Zero-bias detector yields high sensitivity with nanopower consumption
   Mitchell Lee
   Circuits Wireless Analog Devices LTC1540
   .. proof-of-concept at 445 MHz. This circuit contains a couple of improvements over the standard L/C-with-whip field-strength meter. Tuned circuits aren’t easily constructed or controlled at UHF, so a transmission line is used to match ...
   May 23, 2023
10. Hall effect split-core current sensor calibration station
    Damian Bonicatto Phoenix Bonicatto
    Circuits Measurement
    .. a calibration stand so in an actual setup you probably want to put a good, calibrated ammeter, like a 5½ digit lab meter, in line with the calibration stand. Also, if you don’t have a constant current power supply, just use ...
    Dec 27, 2022

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