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Find a qualitative electrolytic capacitor is more difficult than to find a more or less qualitative resistor. If the Chinese non-resistors by their characteristics can exceed expensive brand products, then with capacitors everything happens differently. So, even in its main parameter - the electrical capacitance - the Chinese non-capacitors never correspond to the values indicated on their case. Clearly, the capacitance of such capacitors is always less than stated.


Frequency
25 50 100 200 500 1000 5000 10000 20000
Jamicon 47 uF 400 V C 47 uF 46,62 uF 46,16 uF 45,73 uF 45,27 uF 44,86 uF 43,08 uF 41,31 uF 38,68 uF
L 862 mH 217 mH 84,86 mH 13,84 mH 2238 uH 564 uH 23,52 uH 6132 nH 1637 nH
Samsung 47 uF 400 V C 45,10 uF 44,75 uF 44,38 uF 44,06 uF 43,52 uF 43,28 uF 41,2 uF 39,23 uF 35,61 uF
L 898 mH 226,41 mH 57,06 mH 14,37 mH 2,3 mH 585 uH 25 uH 6,4 uH 1,7 uH
Samsung 47 uF 400 V C 46,54 uF 46,18 uF 45,80 uF 45,46 uF 45,05 uF 44,63 uF 42,63 uF 40,79 uF 37,69 uF
L 870 mH 219 mH 55,3 mH 13,92 mH 2,2 mH 567 uH 23,77 uH 6,2 uH 1,6 uH
G-LUXON 150 uF 400V C 137,89 uF 137,1 uF 136,3 uF 135,6 uF 134,5 uF 133,6 uF 128,5 uF 126 uF 127 uF
L 293 mH 74 mH 18,57 mH 4,6 mH 750 uH 190 uH 7,8 uH 2 uH 0,5 uH
Nippon Chemi-Con 180 uF 450 V C 171,6 uF 170,2 uF 169 uF 167,5 uF 165,3 uF 163,2 uF 153,8 uF 147,7 uF 139,7 uF
L 236 mH 59,5 mH 15 mH 3,7 mH 612 uH 155 uH 6,5 uH 1,7 uH 0,45 uH

What does it mean? Electrolytic capacitors are undesirable to use in circuits with variable signal. As can be seen from the table, at different frequencies such capacitors have different effects on the signal. It is much better to use non-polar capacitors in terms of quality, because their capacitance does not change at all frequencies. However, they have large dimensions. Hence, we need to choose between the quality of the output signal or the large dimensions of the device.

Some radio amateurs use non-qualitative capacitors, and electrolytic capacitors with non-polar capacitors of small capacity. They believe that this way you can improve the amplification of the audio signal at high frequencies. As measurements show, this method of compensating the capacitance of power capacitors at high frequencies is inefficient and even harmful. When the electrolytic capacitor is connected to the non-polar capacitor, the total capacitance at high frequencies of the audio range is fantastically reduced.