Switching amplifier.

[jleaman]

Has any one ever built a switching amplifier. i have had this magazine with full details and pcb lay out of a 65watt full switching power amp stereo with power supply and all has any one ever heard of it or built one..

Might be some thing that i want to tackle..


Jason,,

if ya need the schematics and pcb layouts any one let me know also i have the full artical scanned please email me for them..

 

[Petter]

No, but my opinion is ...

No, but my opinion is that unless your approach is purely digital, it will not be performing all that well (because you will be adding a layer of D/A + AD which is uneccessary unless your source is analog).

Over on Yahoo, there is a Digital Amp forum. It is not very active, but the history may be useful.

http://groups.yahoo.com/group/digital_amp/


Petter

 

[AudioFreak]

There are a number of digital amp topologies and the sound will differ depending on which topology you use .... having said that i haven't heard of or seen a digital amp that can match the alephs or a good tube amp....

 

[jackinnj]

Texas Instruments has good info on switching amplifiers on their website www.ti.com

 

[jleaman]

Power supply circuit..

Here is the power supply sircuit.. in protell 98

Jason

 

[djk]

Couldn't open up the file. I hope this is not the transformerless death wish from the April issue of RE/PE from about six years ago? That was a bad joke.

 

[jleaman]

Ahhhhh

Ahh wat do you mean bad joke ?


Didnt this amp work ?

Jason

 

[djk]

April 1st is a bad joke day. That amp had so many problems it would take hours to discuss even a few of them. Consider just three: 1)line operated supply with hot chassis and no transformer for isolation. 2)the author has you cutting the bottoms out of old tin cans for soldering on to some diode leads for heatsinking. 3)no anti-aliasing filters.

 

[AudioFreak]

The file above (in zip file) is in protel schematic format.

 

[jleaman]

HUmm

I think that your talking about a difrent amp..

 

[jleaman]

Here is the one that i am talking about.

Here is the pic

 

[djk]

That is exactly the one I was thinking about.

 

[Matt MacBeth]

Switching amplifier - cheap and dirty!

I've built a switchmode amp using a 556 (dual 555) cmos timer and a power mosfet output. It actually works quite well, but nowhere near the quality of a ZEN.

Set one section as an oscillator at whatever frequency. Run the output of that section to the trigger input of the other section. On the control voltage line of the second, run the analog input in here. The output of the second section goes to the FET.

Voila, a switchmode amp.

It is a cool little project. (I used it for preliminary research for high-efficiency subwoofer amp when I worked for a car audio company)

Matt

 

[Electro]

Matt MacBeth, do you mind giving us a schematic using a 556 timer as a switching amplifier.

 

[jleaman]

here

Here is the switch mode powersupply used in this amp in protel format it is zipped if there is a question please email me ill answer to my best this is just copyed from the page ( from magazine ) to schematic in protel

Jason

 

[Electro]

I don't have protel. Please convert it into GIF, JPG, or PDF.

I would like a schematic from Matt MacBeth that uses a 555 timer.

 

[jleaman]

i dont know how to .. convert

I dont know how to convert it to pdf or i would..

Do you know how to..


Jason

how do i convert to a jpeg or pdf

 

[AudioFreak]

here it is in gif format i zipped it because it is too large to be accepted here otherwise.

 

[Electro]

AudioFreak, it is a Bitmap file not GIF. Also is a switching power supply.

JasonL, ever heard of using the Print Screen in either Windows or LINUX.

 

[jleaman]

Yeah i can do that

Well if you want i can do that and didnt you know tha t PROTEL doesnt work in LINUX