I'm redesigning an amplifier circuit. I'm using the TEA2025B. In the circuit there are some polyester capacitors, I would like to know if there are problems in replacing these polyester capacitors with ceramic capacitors. I have found ceramic capacitors with capacitance and voltage equal to the capacitors of polyester, but I do not know if it is correct to change.
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asked Oct 25, 2018 at 19:40
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3\$\begingroup\$ Microphony comes to mind. \$\endgroup\$– winnyOct 25, 2018 at 19:41
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5\$\begingroup\$ Depending on the dielectric, ceramic caps tend to be less precise, and have capacitances that vary with voltage. By the time you've gotten a really good ceramic cap it's a C0G, and the last time I looked those were bigger and more expensive than polyester caps at typical audio ratings. \$\endgroup\$– TimWescottOct 25, 2018 at 19:46
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2\$\begingroup\$ Better you should replace them with polypropylene. \$\endgroup\$– Robert EndlOct 25, 2018 at 21:35
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2\$\begingroup\$ In short: it'll probably work, but there might be weird side effects. Better to stick with film caps. \$\endgroup\$– HearthOct 25, 2018 at 21:36
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1\$\begingroup\$ I side with Robert. Polypropylene capacitors can have a high cost, but they are the only capacitors that can tolerate high current high frequency square waves without shorting or oxidizing. I have tested many types so I know this to be true, if pulse is no more than 2/3 rated AC+DC peak volts. \$\endgroup\$– user105652Oct 26, 2018 at 0:08
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