Sorry it was way past my bed time and I needed to be up early this morning so I didn't have time to explain it better.rocklander wrote:hmm.. thanks.. it just went past my level of understanding
Single ended supply - a single supply, like a battery.
Split supply - That would be like having 2 batteries one to give a +ve above the ground, the other to give a -ve. You connect the + on one to the - on the other and that is your ground. How almost all audio equipment (with the exception of stomp boxes) is designed.
On the diamond buffer (above) with a split supply, your input would be referenced to ground (the centre point of the supply voltage), and your phones would go between the output and this centre ground. It is all DC coupled so the frequency response will be flat down to DC (0Hz).
To make it single supply add the capacitor as below. Cap value (combined with phones impedance) will determine the low frequency response, bigger cap = lower frequency.
Sorry for my crappy edit.
Probably best to go with mictester's LM386 because the diamond buffer is the output stage and would probably need an opamp in front of it for some gain.