Series coupling capacitor? What is it?

Question

Is it a certian way to wire a regular capacitor or is it a special type of capacitor? I'm trying to build a circuit with it in it from the book
"Miniature Projects for Electronic Hobbyists."

Answer 1

A series coupling capacitor blocks the DC component of a signal, allowing only the AC component to pass through. The value of the capacitor depends on the impedance of the circuit and the lowest frequency you want to couple:

C(min) = 1 / (2π R f)

The type of capacitor to use depends on the required capacitance, the frequency range of the circuit, the voltage levels involved, and other design factors. Mica and glass capacitors are well suited for radio frequencies. Ceramic capacitors can be used at both audio and radio frequencies. Polystyrene and polycarbonate capacitors, because of their higher values, are more suited to audio.

Sometimes for low frequency and low impedance applications, where a high capacitance is required, it becomes necessary to use an electrolytic capacitor in the coupling circuit. Electrolytic capacitors can be used if you ensure that the DC voltage across the capacitor is not reversed. There are also non-polarized electrolytic capacitors available where this is not a problem.

Answer 2

A series coupling coupling cap is one that allows alternating signals to pass between circuits but blocks DC. It can be any size, depending on the frequency of the signal. DON"T use an electrolytic cap. It will explode.

Answer 3

Eds right. At radio frequencies you generally find ceramic or mica capacitors. Where at audio it would be polyester.