Re: LM1875 on a single supply

"Jasen Betts" <jasen@[EMAIL PROTECTED]
> wrote in message
news:g54pbg$435$6@[EMAIL PROTECTED]
> On 2008-07-01, Dan Coby <adcoby@[EMAIL PROTECTED]
> wrote:
>
>> I would like to point out that the single supply schematic has a 2200
uF
>> capacitor in series with the output speaker. In theory, with an ideal
>> capacitor, this is going to give an 18 Hz cutoff frequency  into a 4
ohm
>> speaker (36 Hz into 8 ohms). A real capacitor will have some internal
>> resistance.  This is going to give a higher cutoff frequency.
>
> Higher? I would have thunk lower.

Yes.  My mistake, the series resistance of the capacitor is going to move
the
break frequency lower.  However the series resistance of the capacitor is
going
to cut the overall gain of the circuit since it will form a voltage
divider with the
speaker impedance.