![]() In other words, if the voltage at the source of the FET were +2V with no signal going through it, then a 1V peak-to-peak signal coming out would alternate between +1.5V and +2.5V. The 0.1uF cap is in your circuit to block the DC offset from the source of the FET. Either type would work fine in your circuit. For example, type 2 ceramics have low temperature stability, while polyesters have more series inductance making them less suitable for radio frequency circuits. Where ceramic capacitors can have temperature problems is because the ceramic has a much lower coefficient of thermal expansion than the metal plates inside it, which can cause the plates to crack the ceramic.Ĭeramic and polyester capacitors have different performance characteristics, but these aren't likely to affect their use in an audio circuit. They use it as a substrate, in place of epoxy/glass PC boards, in applications where the circuit will be used in extremes of temperature, like satellites. That's a lot of heat!Ĭeramic can withstand an awful lot of heat. In a wave soldering machine the components go over a flux applicator, and then through two heating chambers before finally going across a fountain of solder. Most components are designed to withstand the heat of soldering. This would be more common with polyester or polystyrene caps, and even then you'd have to get them pretty hot. It would be very unusual for a ceramic cap to fail because of heat. Before you replace it, make sure you don't have something grounded accidentally on the other side of the cap. ![]()
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