.. 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 ...
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 ...
.. 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 ...
.. 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 ...
.. 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 ...
.. 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 ...
.. 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 ...
.. 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 , ...
.. 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 ...