Lucifer wrote:In a very simple nutshell, without going into the actual physics and maths of their behaviour, capacitors 'pass' high frequencies and resist low frequencies.
It's easy to remember which way round that is, if you bear in mind that caps are open circuit to DC, which is 0Hz - so low frequencies - which are nearer DC than high frequencies, have difficulty getting through, while the high frequences get through more easily.
So, looking at part 1 of the circuit, high frequencies will be allowed to pass through the cap - so the circuit is a High Pass filter.
The reistor in series with the cap forms a potential divider with the input impedance of the amp/pedal/whatever, reducing the input level to prevent overload, etc.
In circuit 2, the cap passes high frequencies to ground (you could call it a High Pass to Ground) while the lower frequencies are ignored by the cap and pass onto the next circuit along - so Circuit 2 is a Low Pass filter (which you understand already).
The formula is correct, and can be applied to both types of filter.
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