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Hi!
Please explain me why exactly use coupling capacitor on the input/outputs at amplifiers ? only for remove DC component ?
Sniper
Now consider the thingymajig outputs at 2vdc with the AC signal catching a ride on top. What we have is a little AC signal that starts at 2vdc yet our amp only works to 1vdc. This is a problem. Solution, put a cap between thingymajig and amp. This removes the 2vdc from the composite AC/DC signal and allows the small signal to enter the amp at the right level.
I hope that made sense
hi,
Basically they are used to connect 'ac signals' to voltage points at different 'dc' potentials.
So base is 'dc' potential and input signal is 'ac'. To connect it together use coupling cap. ok but why then output cap ?
Hi
so hw does this coupling capacitor differ from an ordinary capacitor??Does'nt an ordinary cap too block an ac n send only the dc??
Hi
so hw does this coupling capacitor differ from an ordinary capacitor??Does'nt an ordinary cap too block an ac n send only the dc??
Does'nt an ordinary cap too block an ac n send only the dc??
WRONG!If a voltage does not dip below zero volts, it isn't AC
Simply use an output coupling capacitor feeding a resistor connected to zero volts.So, how does one obtain an AC audio signal (centred on zero volts) from a circuit powered on a DC voltage?
Of course AC can also have a DC voltage. It does not need to go positive and negative. It just needs to alternate up and down.How can you have an AC signal riding on a DC voltage? It's not AC if that voltage does not go below zero volts - it's simply a pulsating DC voltage.
You are mixed up.The question I have, is that is the signal output (via a capacitor) from a simple transistor amplifier a true AC signal (as in, voltage is centred at zero volts) or is it that the lowest value in the waveform is actually zero volts, the waveform itself being at or above zero volts, never below.