high res PWM module for HI-FI amplifiers (DIY)

[AP2]

Hello developers,
if you want to build an amplifier with very high resolution for jazz and classical music then it is now very easy with this module PWM, this also solves the PCB, I can assure you that with a pre-fiberglass board you get a sn / r-100dB.
I have attached a simple amplifier just to see the phase and the connection that is needed (very simple).
This PWM module with another type of power stage (no IR21xx) has a THD of 0.002% at 100W out (4R).
forms are available at a cost of components, but when I do not know how you can buy.
We'll let you know as you may have.

Regards

[81bas]

is it selfoscillating or clocked?

[AP2]

Originally Posted by 81bas

is it selfoscillating or clocked?

Hi,it is clock trw modulator (sheme of Amplifier work but it is for demo (connession and phase of signals) necessary for use this.
in this moment I know that this module can buy on Ebay at short.

Regards

[Kahn]

Hi,

The outer feedback loop is for DC-Offset correction

Kahn

[AP2]

Originally Posted by Kahn

Hi,

The outer feedback loop is for DC-Offset correction

Kahn

yes,but ops! not see 82R in series at capacitors,sorry.
modulator is very stable also at bridge up to 1Kw (8R).
but point of force is resolution/noise,very good as A-b class.

Regards

[AP2]

Hi All,
I cecked scheme and now it is correct.
A short i put PCB with this identical scheme and measures, just for demostrate that it work perfectly and stable, sure, it possible connect this modulator at professional power stage (not IR21xx) for very professional performances.
but with this simple low cost scheme i listen with very surprise in definition of sound.
With this scheme,modulator is capable di clip at (vcc rail-700mV) ,super nais efficiency!

Regards

[AP2]

Hi,
Modulator on amplifier (TRW-scheme)

Regards

[Kahn]

Originally Posted by AP2

yes,but ops! not see 82R in series at capacitors,sorry.
modulator is very stable also at bridge up to 1Kw (8R).
but point of force is resolution/noise,very good as A-b class.

Regards

Hi, it means the output power bandwidth of amplifier is not independent of load impedance connected. It will give different response with different loads, because the outer loop does nothing for audio, all it does is for dc-offset.

[81bas]

Is there any info about loop-gain / PSRR for this modulator available?

[Kahn]

Originally Posted by AP2

yes,but ops! not see 82R in series at capacitors,sorry.
modulator is very stable also at bridge up to 1Kw (8R).
but point of force is resolution/noise,very good as A-b class.

Regards

Hi, one more surprise in your drawing, why the capacitor at output is 680uF

Kahn