A Basic Explanation of amp parts and how they work

[CaptainzPlanetz]

I found this a bit intresting, and though it would be a good post.

The amp being used for the example is the SoundDigital 12kD.

Here is the link to the original thread

http://www.caraudioclassifieds.org/forum/s...ead.php?t=21587

Hello

With this basic highlights we can discuss a little bit how the amplifier works.

A- Power transformers: they are connected to the battery positive +12V (or any voltage in the 8-18V range) and to the Power supply FETs, which will open and close (controlled by the microprocessor) and generate an AC voltage on their outputs.

B- Power Supply FETs: explained on A. Each one is rated at 202A continuous, but they can handle up to 4x this number by working pulsed. Working in PWM mode, the time they stay opened changes all the time in order to control the power supply voltage and not damage the output stage. This is why our amplifiers work from 8V to 18V or even more.

C- Power diodes: Just as in a alternator, they rectify the alternating voltage into DC voltage.

D- Capacitor bank: Provide the capacitance needed to eliminate the pulsating ripple. After the Capacitors the voltage on the SD12kD can be up to 250Vdc.

E- Output FETs: 16 units working in H-bridge mode (means that all voltage RMS from power supply is provided to the load). Being a D class amplifier they work in PWM mode to build a sine shaped signal.

F- Current detection: shunt resistors measure the current from the power supply and send the information to the brain of the amplifier, the 20MHz microprocessor. If a short-circuit occur on the output, the microprocessor shut down the power supply, as an example.

G- Output filter: Being a low-pass filter, it will clean the high-frequency modulating signal from the output stage, allowing only the audio-range signal to pass.

H- Microprocessor and drivers, together they control all the switching devices (FETs) and monitor the protections.

[MXmike800]

hmm pretty neat thanks

[cjvue]

good info....