On Tue, 1 Jul 2008 13:30:05 -0700 (PDT), mrdarrett@[EMAIL PROTECTED]
wrote:
>On Jul 1, 12:15 pm, John Fields <jfie...@[EMAIL PROTECTED]
> wrote:
>> On Tue, 1 Jul 2008 11:55:35 -0700 (PDT), mrdarr...@[EMAIL PROTECTED]
wrote:
>> >On Jul 1, 11:48 am, Don Bowey <dbo...@[EMAIL PROTECTED]
> wrote:
>> >> On 7/1/08 11:30 AM, in article
>> >> a1662fad-e0d7-4306-9e20-195abb1e7...@[EMAIL PROTECTED]
>>
>> >> "mrdarr...@[EMAIL PROTECTED]
" <mrdarr...@[EMAIL PROTECTED]
> wrote:
>> >> > I was reading the datasheet for the LM1875
>> >> >http://www.national.com/ds.cgi/LM/LM1875.pdf
>>
>> >> > and I noticed that they do have a schematic for a single supply
(as
>> >> > opposed to a +/- supply).
>>
>> >> > If running on a single supply, does the chip amplifer consume
>> >> > significant power during quiet tracks?
>>
>> >> > Would this be pretty much the same as running the amplifier in
Class A
>> >> > mode (vs. Class AB)?
>>
>> >> > I'm trying to figure out if I really need a +/- power supply, or
if I
>> >> > can just go with a single supply (easier to build).
>>
>> >> > Thanks,
>>
>> >> > Michael
>>
>> >> The datasheet does have a "Typical Single Supply Operation"
schematic.
>> >> Have another look.
>>
>> >Yes, that's what I said. There is a schematic. It's on Page 2.
>> >(amused grin)
>>
>> ---
>> Look at "Supply Current" on page 2 and read: "Power Dissipation and
>> Heat Sinking" on page 6.
>>
>> JF
>
>
>
>Ah, so apparently the chip does not use more power with a single
>supply than with a +/- supply.
>
>Is there any reason why I should NOT use a single supply with this
>chip?
---
I don't think so, but try it and see if it works the way you want it
to. If it does you've saved a supply, but if it doesn't it's only
cost you a handful of discretes.
JF
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