Rickresource Rickenbacker Forum

ken_j wrote:I'm disappointed CJ. You could have thown some math in there.

ken_j wrote:I'm disappointed CJ. You could have thown some math in there.

cjj wrote:

bassduke49 wrote:

cjj wrote:But, class D is a switching amplifier, which as Jeff said, has nothing to do with the power supply.

In a class D amp, the output transistors are either fully on or fully off instead of operating in the "linear" range. With modern MOSFET transistors, which have a very low ON resistance, this makes an amp extremely efficient since excess power is really only dissipated during the transition period (where the transistor is partially on, which is where most amp topologies run all of the time).

Class D amplifiers use a pulse width modulation method which varies the "on" time of the transistors to achieve differences in output level. If the frequency at which the transistors are switched is sufficiently higher than the signals being amplified it is a simple matter to design a low pass filter to "reconstruct" the analog signal at the amplifier output. This is very similar to the way an digital to analog converter works.

So, in a sense, this does make them behave in a digital manner since digital circuits typically operate in 2 states, on or off, but it's not really quite the same...

My head hurts.

Sorry, I'm a Techno-Geek, sometimes I just can't help myself...

ken_j wrote:I'm disappointed CJ. You could have thown some math in there.

ricnbacker wrote:

cjj wrote:

bassduke49 wrote:
My head hurts.

Sorry, I'm a Techno-Geek, sometimes I just can't help myself...

thats quite ok. I am sure all that stuff means something important. at least someone knows it

cjj wrote: thats quite ok. I am sure all that stuff means something important. at least someone knows it

cjj wrote:Actually, I just make it all up...