My One Question !

transistor495 · Jan 28, 2011

audioguru said:
Maybe my photo was too big. Trying this smaller photo:**broken link removed**

See if you can see the insert image button highlighted on red circle:

audioguru · Jan 28, 2011

That is how I have been inserting my images including this small one:
**broken link removed**

transistor495 · Jan 28, 2011

Nope..that won't work..that will only work on external image urls...forum complaint..mine uploaded to imageshack first then loaded from there

audioguru · Jan 28, 2011

I give up trying to add an image from my computer.
Here is what I see. This one is a "Go Advanced" thumbnail.

4pyros · Jan 28, 2011

OK hows this?

audioguru · Jan 28, 2011

4pyros said:
OK hows this?

Which class-D stereo amplifier do you have?

4pyros · Jan 28, 2011

Which class-D stereo amplifier do you have?

Just picked up 6 QSCs for a pyromusical sound system I am putting together.

audioguru · Jan 28, 2011

QSC has many stereo amplifiers. I don't know which one you have that is powered from only 12VDC.

4pyros · Jan 29, 2011

QSC has many stereo amplifiers. I don't know which one you have that is powered from only 12VDC

Sorry I never said thay are 12 volt.

Which class-D stereo amplifier do you have?

I am assuming this came from another thread. I dont have 12 volt class D amps, but thay are made.

Here is some stuff on class T-class D low voltage amps.

http://www.decdun.me.uk/t_amps.html
Andy

audioguru · Jan 29, 2011

4pyros said:
Sorry I never said thay are 12 volt.
I am assuming this came from another thread. I dont have 12 volt class D amps, but thay are made.

In post #25 in this thread you show the photo of a class-D (or class-T) stereo amplifier that is powered from only 12VDC.

Here is some stuff on class T-class D low voltage amps.

Tripath company "invented" and manufacturered class-T amplifier ICs which is a slightly modified class-D circuit. It didn't work very well so they went bankrupt 4 years ago. Many Chinese companies still sell the ICs or copies of them.

4pyros · Jan 29, 2011

Sorry scrooge, its not mine,it came from here;
Help Wiring a Replacement Potentiometer for Sonic T - diyAudio
its a board out of a Sonic Impact T Amp that uses a Tripath chip P.N. TA2024.
Andy

Electroenthusiast · Jan 29, 2011

You can just detach the speaker from ur audio device, then build an amplifier with POT at the output. Now varying the POT, the output voltage changes and thus the output volume. So the intensity of sound = Voltage at the output.

4pyros · Jan 29, 2011

then build an amplifier with POT at the output

Why would you what to do that instead of at the input?

audioguru · Jan 29, 2011

A modern audio amplifier has an extremely low output impedance (0.003 ohms to 0.04 ohms) that damps the resonances of a speaker. If you connect a huge expensive pot at the output to control the volume then the pot will burn up and the speaker will resonate and sound boomy like a bongo drum. Therefore a small inexpensive volume control is used at the input of the amplifier where the power is very small.

4pyros · Jan 29, 2011

scrooge: Have you seen that T amp before?

audioguru · Jan 29, 2011

Many Chinese websites are trying to sell amplifiers made with obsolete Tripath class-T amplifier ICs or copies of them.
I stay away because Tripath went bankrupt.

A company called 41Hz Audio (in Sweden) used to sell and still might sell amplifiers that use Tripath or copies of their ICs.

Lookup Tripath in Google.

4pyros · Jan 29, 2011

I stay away because Tripath went bankrupt.

Thats a shame, I hear thay were good.

audioguru · Jan 29, 2011

4pyros said:
Thats a shame, I hear thay were good.

If they were good then they would not have gone bankrupt.

4pyros · Jan 30, 2011

If they were good then they would not have gone bankrupt.

As far as I can tell the chips ware fine the company had problums.

audioguru · Jan 30, 2011

Tripath could not compete with Texas Instruments and many other huge established IC manufacturers. So they failed.

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