Looking for 4 channel x 100w RMS amp schema

packetrace · 28th January 2011, 03:00 PM

Hey ther...i'm new here....I'm a student in electrical engineering at college....i'm looking for a schema to do a 4 channel x 100w RMS for my car speaker....2 stereo IN...and 4 OUT

THANKS
Anthony

Tekko · 28th January 2011, 03:59 PM

I guess your not allowed to just go an buy a 4x100w caramp.

Maybe the quasi amp for beginners by apex audio x4 would suffice.

packetrace · 28th January 2011, 04:06 PM

No...we want to say...I DIT IT MY SELF

toprepairman · 28th January 2011, 04:55 PM

But if we help you then you won't have done it yourself........

packetrace · 28th January 2011, 05:00 PM

I don't need to design the schema...I need to BUILD the amp!

AndrewT · 28th January 2011, 06:07 PM

What supply voltage does it have to run from?
What impedance are the speakers?
Do they need to be real Watts of output or would any old PMPO power output do?

packetrace · 28th January 2011, 06:10 PM

Real watts !!

4 ohms speaker

12V supply as it will be in a car !

AndrewT · 28th January 2011, 06:19 PM

A 12Vdc supply will allow a maximum of ~+-5Vpk into your 4ohm load.
This is equivalent to ~3W into 4ohm.

If you build a balanced or bridged amplifier using the 12Vdc supply you may get 6W into 2ohm from one half of the amplifier. When bridged/balanced you can expect 12W into 4ohm speaker.
You now need 8channels of amplification each capable of 6W into 2ohms (reactive speaker) to get 4channels of 12W maximum power output.

Do you see a problem?

Maybe the purpose of the project is to recognise that the target is impossible to attain from a 12Vdc supply.

Guess where your research will take you next?

packetrace · 28th January 2011, 06:21 PM

Yeah I know...but its 12V from my car battery...but there will be a powersupply to get higher voltage input !....

ostripper · 28th January 2011, 06:25 PM

Quote:

Originally Posted by packetrace

Real watts !!

4 ohms speaker

12V supply as it will be in a car !

For real watts , you need a switching power supply (12V to +/- 40-50V).. this is typical of most analog OEM multichannel "blasters". The amps are typically LIN topology 1 or 2 output pair pair class AB.

OS

28th January 2011, 03:00 PM	#1
packetrace diyAudio Member Join Date: Jan 2011	Looking for 4 channel x 100w RMS amp schema Hey ther...i'm new here....I'm a student in electrical engineering at college....i'm looking for a schema to do a 4 channel x 100w RMS for my car speaker....2 stereo IN...and 4 OUT THANKS Anthony

28th January 2011, 06:07 PM	#6
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	What supply voltage does it have to run from? What impedance are the speakers? Do they need to be real Watts of output or would any old PMPO power output do? __________________ regards Andrew T.

28th January 2011, 06:19 PM	#8
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	A 12Vdc supply will allow a maximum of ~+-5Vpk into your 4ohm load. This is equivalent to ~3W into 4ohm. If you build a balanced or bridged amplifier using the 12Vdc supply you may get 6W into 2ohm from one half of the amplifier. When bridged/balanced you can expect 12W into 4ohm speaker. You now need 8channels of amplification each capable of 6W into 2ohms (reactive speaker) to get 4channels of 12W maximum power output. Do you see a problem? Maybe the purpose of the project is to recognise that the target is impossible to attain from a 12Vdc supply. Guess where your research will take you next? __________________ regards Andrew T.

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28th January 2011, 03:59 PM	#2
Tekko diyAudio Member Join Date: Jan 2005	I guess your not allowed to just go an buy a 4x100w caramp. Maybe the quasi amp for beginners by apex audio x4 would suffice.

28th January 2011, 04:06 PM	#3
packetrace diyAudio Member Join Date: Jan 2011	No...we want to say...I DIT IT MY SELF

28th January 2011, 04:55 PM	#4
toprepairman diyAudio Member Join Date: Nov 2010	But if we help you then you won't have done it yourself........

28th January 2011, 05:00 PM	#5
packetrace diyAudio Member Join Date: Jan 2011	I don't need to design the schema...I need to BUILD the amp!

28th January 2011, 06:10 PM	#7
packetrace diyAudio Member Join Date: Jan 2011	Real watts !! 4 ohms speaker 12V supply as it will be in a car !

28th January 2011, 06:21 PM	#9
packetrace diyAudio Member Join Date: Jan 2011	Yeah I know...but its 12V from my car battery...but there will be a powersupply to get higher voltage input !....

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