NEWBIE: Designing a Simple Audio Amp
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Posted by N. Thornton on January 8, 2005, 1:10 pm
Please log in for more thread options NoSpam@daqarta.com (Bob Masta) wrote in > wrote:
>> Power amp gains are typically set so a "line level" of about 1 VRMS
rails.
>> will drive them to their maximum output, which depends mostly upon >> the power supply rails... you size your devices to handle the >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,
right, but the amp can only give that if its supplied with enough V to deliver that, which it wont be in practice. What the amp does is take the power supply V and limit it to whatevers needed for the speaker at any moment. > and the power on
a
>the 8 ohm speaker is then (20^2)/8 = 50W? But it says that TBA820M is >2W power amp (on 8 ohm load and 12V rails).
Hence under those circumstances it would have a life maesured in seconds, maybe less. NT | ||||||||||
