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