warpie
Well-known member
- Joined
- Feb 7, 2009
- Messages
- 1,583
What is the criteria for choosing the correct coupling cap in a circuit.
I realise that the value depends on the impedance of the circuit and on the required Fc, which should be well below 20Hz (is around Fc=5Hz low enough)? However, I've seen circuits where (let's say) a 10uF cap will provide a cutoff @ 5Hz but instead a much larger cap is being used (22uF, 33uF or even higher).
So, what is the correct procedure for choosing the right cap?
I somehow feel that ESR and self resonance play a role here but could someone explain it to me?
Many thanks!
I realise that the value depends on the impedance of the circuit and on the required Fc, which should be well below 20Hz (is around Fc=5Hz low enough)? However, I've seen circuits where (let's say) a 10uF cap will provide a cutoff @ 5Hz but instead a much larger cap is being used (22uF, 33uF or even higher).
So, what is the correct procedure for choosing the right cap?
I somehow feel that ESR and self resonance play a role here but could someone explain it to me?
Many thanks!