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Capacitor types - Revision history
2024-03-28T13:18:08Z
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Admin at 22:36, 5 November 2021
2021-11-05T22:36:38Z
<p></p>
<p><b>New page</b></p><div>Types of Capacitors<br />
<br />
<br />
(in descending order of stability)<br />
<br />
<br />
* NP0 (negative positive zero, aka 'C0G', aka 'NPO')<br />
<br />
- extremely stable in rf oscillators<br />
<br />
- temperature stable<br />
<br />
- crystal oscillators<br />
<br />
- variable frequency oscillators (VFO)<br />
<br />
- beat frequency oscillators (BFO)<br />
<br />
- rf coupling circuits<br />
<br />
- temperature use -55C to 125C<br />
<br />
- capacitance change +/- 0 to 30ppm/C<br />
<br />
<br />
<br />
* (silver) mica<br />
- stable over wide temperature range<br />
<br />
- rarely fail<br />
<br />
- often used for oscillators<br />
<br />
- same use as NP0 (RF circuits)<br />
<br />
- capacitance change +/- 0 to 50ppm/C<br />
<br />
<br />
<br />
* polystyrene (film)<br />
- good for oscillators<br />
<br />
- stable but keep in cool temperatures<br />
<br />
- capacitance changes permanently when heated too much<br />
<br />
- used in solid state equipment (around tubes is too hot)<br />
<br />
<br />
<br />
* ceramic<br />
- rarely fail<br />
<br />
- rf bypass capacitors<br />
<br />
- never use for oscillators or tuned circuits<br />
<br />
- slightly microphonic<br />
<br />
- X5R (-55C to 85C)<br />
<br />
- X7R (-55C to 125C)<br />
<br />
- Y5V (-30C to 85C)<br />
<br />
- Z5V (10C to 85C)<br />
<br />
<br />
<br />
<br />
* PP/polypropylene (film) (orange/brown/green drop) <br />
- rf coupling<br />
<br />
- good for audio amps<br />
<br />
- not for oscillators<br />
<br />
- not very stable<br />
<br />
<br />
<br />
* PET/polyester (film) (MKT, Mylar)<br />
- heat and humidity resistance<br />
<br />
<br />
<br />
<br />
<br />
<br />
* tantalum<br />
- not for audio<br />
<br />
- non-linear<br />
<br />
- good for rf bypass<br />
<br />
- good for timing (e.g. 555)<br />
<br />
- available in capacitances well above 1uF<br />
<br />
- polar<br />
<br />
- temperature stable<br />
<br />
<br />
* Electrolytic (aluminium film)<br />
- poor stability<br />
<br />
- available in capacitances well above 1uF<br />
<br />
- good for timing (e.g. 555)<br />
<br />
- polar<br />
<br />
<br />
<br />
<br />
* paper in oil<br />
- stability ok<br />
<br />
- replace (paper goes acidic over time)<br />
<br />
- replace with polypropylene<br />
<br />
<br />
* foil capacitor (old style)<br />
- stability ok<br />
<br />
- replace with polypropylene</div>
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