Wanted: Simple megaphone-p.a. amplifier schematic

[Sal Brisindi]

Hi There,
Does anyone have a schematic for a half way simple PA amplifier around
10 watts to run off a 12 volt gel cell. I do have a few PA amps but I
want to make something small to fit inside a speaker box.

I did the usual google search but didn't find anything out there.

Regards,
Sal Brisidi

 

[Ninja]

Hi There,
Does anyone have a schematic for a half way simple PA amplifier around 10
watts to run off a 12 volt gel cell. I do have a few PA amps but I want to
make something small to fit inside a speaker box.

I did the usual google search but didn't find anything out there.

Regards,
Sal Brisidi

Here's one I found Googling for "10W Audio IC". It has the schematic and
printed circuit board layout too.

http://www.st.com/stonline/products/literature/ds/1469/tda7240a.pdf

 

[Yukio YANO]

Hi There,
Does anyone have a schematic for a half way simple PA amplifier around
10 watts to run off a 12 volt gel cell. I do have a few PA amps but I
want to make something small to fit inside a speaker box.

I did the usual google search but didn't find anything out there.

Regards,
Sal Brisidi

Use an old CB Radio !!!

Yukio YANO

 

[Eeyore]

Hi There,
Does anyone have a schematic for a half way simple PA amplifier around
10 watts to run off a 12 volt gel cell. I do have a few PA amps but I
want to make something small to fit inside a speaker box.

Just about any application note for an audio ampliifer chip designed for car use
will give you the power amp section. Use 2 amplifiers in 'bridge mode' to get a
power level of 10W or so.

A suitable microphone pre-amp stage can be made from a single op-amp. There must
be hundreds of examples out there of that online.

Graham

 

[Sal Brisindi]

Just about any application note for an audio ampliifer chip designed for car use
will give you the power amp section. Use 2 amplifiers in 'bridge mode' to get a
power level of 10W or so.

A suitable microphone pre-amp stage can be made from a single op-amp. There must
be hundreds of examples out there of that online.

Graham

Thanks all,
I guess I should have mentioned I wanted to use discrete components but
using a IC sure will save the parts count.

Regards,
Sal

 

[Eeyore]

Thanks all,
I guess I should have mentioned I wanted to use discrete components but
using a IC sure will save the parts count.

I can't think of a single good reason to use discretes for this application.

Graham

 

[Sal Brisindi]

I can't think of a single good reason to use discretes for this application.

Graham

Graham,
You win, ee neither...

Thanks,
Sal

 

[Tim Wescott]

I can't think of a single good reason to use discretes for this application.

Graham

I could see doing it for the learning exercise -- but otherwise, no.

--
Tim Wescott
Control systems and communications consulting
http://www.wescottdesign.com

Need to learn how to apply control theory in your embedded system?
"Applied Control Theory for Embedded Systems" by Tim Wescott
Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html

 

[Ninja]

I guess I should have mentioned I wanted to use discrete components but
using a IC sure will save the parts count.

Here's a schematic for a 15 watt amp using discrete components. I'm sure
you'll agree that even the power amp stage alone is far more complicated
than the IC approach, but here it is.

http://www.fender.com/support/amp_schematics/pdfs/Frontman_15G_Schematic_68F.pdf

 

[Rich Grise]

Here's a schematic for a 15 watt amp using discrete components. I'm sure
you'll agree that even the power amp stage alone is far more complicated
than the IC approach, but here it is.

http://www.fender.com/support/amp_schematics/pdfs/Frontman_15G_Schematic_68F.pdf

I once saw a bullhorn circuit with a carbon mic, a common-base 2N3055, and
a speaker. It ran on a 6V lantern battery.

Cheers!
Rich

 

[Ninja]

Here's a schematic for a 15 watt amp using discrete components.

My mistake. That one uses an IC output stage.

But here's an exmple of a typical 10W transistor amp.

http://www.redcircuits.com/Page61.htm

 

[Sal Brisindi]

My mistake. That one uses an IC output stage.

But here's an exmple of a typical 10W transistor amp.

http://www.redcircuits.com/Page61.htm

Thank you all for your input.

I ordered some power amp IC's...

Regards,
Sal