Bob Masta
Guest
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 Posted:
Thu Jan 06, 2005 8:10 pm Post subject:
Re: NEWBIE: Designing a Simple Audio Amp |
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On 05 Jan 2005 18:59:46 GMT, Ricky Romaya <something@somewhere.com>
wrote:
| Quote: | NoSpam@daqarta.com (Bob Masta) wrote in
news:41d80947.1263957@news.itd.umich.edu:
On 01 Jan 2005 17:04:46 GMT, Ricky Romaya <something@somewhere.com
wrote:
Power amp gains are typically set so a "line level" of about 1 VRMS
will drive them to their maximum output, which depends mostly upon
the power supply rails... you size your devices to handle the rails.
Care to elaborate on this? I've noticed that the power amp op-amps have
their gain preset. Do you mean that to drive them to max output, you need
1 VRMS input? Take TBA820M for example, it's gain is preset to 20 (if not
mistaken), then a 1 VRMS input will give 20 VRMS output, and the power on
the 8 ohm speaker is then (20^2)/8 = 50W? But it says that TBA820M is a
2W power amp (on 8 ohm load and 12V rails).
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Sorry for the confusion. I was speaking of discrete power amps,
like for home stereo. But the numbers are about what you mention:
a gain of 20 or so. Most home stereo discrete amps are in the 50-100
watt range.
Best regards,
Bob Masta
dqatechATdaqartaDOTcom
D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
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