resonant tank circuits |
When a capacitor (C) and inductor (L) are connected in parallel, they form a resonant tank circuit that resonates at one frequency. The table below lists the theoretical resonant frequencies (in kilohertz) for some common values of capacitors (in picofarads) and inductors (in microhenrys). The real-world resonant frequencies will vary a little due to stray capacitances in the circuit components, variations in component values caused by temperature fluctuation, etc. |
L = | 50 uH | 100 uH | 150 uH | 200 uH |
39 pF | . | . | . | 1802 |
47 pF | . | . | . | 1642 |
56 pF | . | . | 1736 | 1504 |
68 pF | . | . | 1576 | 1365 |
82 pF | . | 1758 | 1435 | 1243 |
100 pF | . | 1592 | 1299 | 1125 |
120 pF | . | 1453 | 1186 | 1027 |
150 pF | 1838 | 1299 | 1061 | 919 |
180 pF | 1678 | 1186 | 969 | 839 |
220 pF | 1517 | 1073 | 876 | 759 |
270 pF | 1370 | 969 | 791 | 685 |
330 pF | 1239 | 876 | 715 | 620 |
470 pF | 1038 | 734 | 599 | 519 |
1000 pF | 712 | 503 | . | . |