Newbie to Auido

Micah · 28th November 2001, 07:49 AM

I have a 6 channel computer sound card and i am wanting to build an amp for it to goto my 5 speaker and 1 sub. dose anyone know where i can find a pcb design of an amp that runs on 12v and has 6 channel input and output? i am very new to audio stuff so i don't know if what i am wanting to do is possable. if there is no 6 channel amp out there could i rig 6 seperate mono amp together? any help would be great

Many thanks

hugobross · 28th November 2001, 10:19 AM

Dear Micah,

*)I don't know any 6 channel amplifier on just one pcb, so I think you have to build 6 mono amplifiers (or 3 stereo versions)

*)I don't know what kind of speakers you want to drive
( ?? ohm; ?? Watt)

*)If you want to use a power supply of 12V, the power of the amplifier will be (very) low. If you have 2 supplies of 12V then you can realise a supply with +12V, 0V (GND), -12V wich allowes more output-power

*)I will look after a schematic, but can you tell us some more details of your expections and your speakers.

best regards,

HB.

Micah · 28th November 2001, 07:04 PM

ok the speakers i want to driver are 5*180 watt speakers and a 1000w sub running all @ 8 ohms. for my power supply i am going to use Computer PSU's, they give out +5v,12v i can rig these up so i can get +10v/24 or +15v/36v

hope this info helps

paulb · 28th November 2001, 07:34 PM

There was a previous discussion about trying to use computer power supplies for an audio amp:
Cheapo amp project help pls

He gave up, it's not practical because computers use low voltage / very high current, while audio has to involve the 8 ohm impedance of the speaker - for high power, you need high voltage.

I'm building an amp right now of about 75 watts per channel, it uses an 84-volt DC power supply (+/- 42V).

A switching inverter could be used to transform DC voltages, but this would probably be more complex than the rest of your amplifier.

The power levels you're talking about would be a complicated and expensive project. Far cheaper to buy something. Except for unusual cases, DIY stuff is not cheaper (it just sounds better).

Kilowatt · 28th November 2001, 08:14 PM

You can't get enough power from a PC power supply to run all your speakers at full volume, and PC power supplies don't have a high dual voltage that you would need for your amp(s). You would need a different supply for the amps. Other than that, it would be fine. Just have an amp for each speaker. http://epanorama.net has many schematics for mono amps. Go to "Audio" then "Circuits to Build."

Micah · 28th November 2001, 09:44 PM

ok, i will need to build 5 mono amps and 1 bass amp and a PSU andone got some pcb designs for it?? i have now chosen 80watt speakers and 1 500watt sub

Micah · 30th November 2001, 05:18 AM

http://sound.westhost.com/project3a.htm

is that a good amp design and if it is could some one list all the comnpontents i wouold nee for it?

paulb · 30th November 2001, 06:22 AM

That's a good choice. If you order the circuit boards you will get a parts list.
Otherwise, just write them down from the circuit diagram.

Micah · 30th November 2001, 07:18 AM

i will make a board my self

i find it a little diffcult to read those numbers, could and ony write them done for me please? along with what part they are (r1,r3,c1....) Many Many thanks to whoever dose it. also i am thinking of making 5 of them for each speaker, will i have to make 5 PS's for them or will one do and how many amps will the input of 240v ac pull for them all?? as i can only pull a max of 20amps off my power sockets

Micah · 1st December 2001, 02:41 AM

ok i got a parts list but have to following probs
A. i can't find anyone with the Q7 and Q8 (A1302 and C3281) transitors in New Zealand
B. what is T1 in the PS design he gives? or dose anyone have access to a good +/- 35v PS design (240v AC 50hz)???

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28th November 2001, 07:49 AM	#1
Micah diyAudio Member Join Date: Nov 2001	I have a 6 channel computer sound card and i am wanting to build an amp for it to goto my 5 speaker and 1 sub. dose anyone know where i can find a pcb design of an amp that runs on 12v and has 6 channel input and output? i am very new to audio stuff so i don't know if what i am wanting to do is possable. if there is no 6 channel amp out there could i rig 6 seperate mono amp together? any help would be great Many thanks

28th November 2001, 10:19 AM	#2
hugobross diyAudio Member Join Date: Jun 2001 Location: Flanders, Belgium	Dear Micah, )I don't know any 6 channel amplifier on just one pcb, so I think you have to build 6 mono amplifiers (or 3 stereo versions) )I don't know what kind of speakers you want to drive ( ?? ohm; ?? Watt) )If you want to use a power supply of 12V, the power of the amplifier will be (very) low. If you have 2 supplies of 12V then you can realise a supply with +12V, 0V (GND), -12V wich allowes more output-power )I will look after a schematic, but can you tell us some more details of your expections and your speakers. best regards, HB.

28th November 2001, 07:04 PM	#3
Micah diyAudio Member Join Date: Nov 2001	ok the speakers i want to driver are 5*180 watt speakers and a 1000w sub running all @ 8 ohms. for my power supply i am going to use Computer PSU's, they give out +5v,12v i can rig these up so i can get +10v/24 or +15v/36v hope this info helps

28th November 2001, 07:34 PM	#4
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	There was a previous discussion about trying to use computer power supplies for an audio amp: Cheapo amp project help pls He gave up, it's not practical because computers use low voltage / very high current, while audio has to involve the 8 ohm impedance of the speaker - for high power, you need high voltage. I'm building an amp right now of about 75 watts per channel, it uses an 84-volt DC power supply (+/- 42V). A switching inverter could be used to transform DC voltages, but this would probably be more complex than the rest of your amplifier. The power levels you're talking about would be a complicated and expensive project. Far cheaper to buy something. Except for unusual cases, DIY stuff is not cheaper (it just sounds better).

28th November 2001, 08:14 PM	#5
Kilowatt diyAudio Member Join Date: Nov 2001 Location: Harlowton, MT, USA	You can't get enough power from a PC power supply to run all your speakers at full volume, and PC power supplies don't have a high dual voltage that you would need for your amp(s). You would need a different supply for the amps. Other than that, it would be fine. Just have an amp for each speaker. http://epanorama.net has many schematics for mono amps. Go to "Audio" then "Circuits to Build."

28th November 2001, 09:44 PM	#6
Micah diyAudio Member Join Date: Nov 2001	ok, i will need to build 5 mono amps and 1 bass amp and a PSU andone got some pcb designs for it?? i have now chosen 80watt speakers and 1 500watt sub

30th November 2001, 05:18 AM	#7
Micah diyAudio Member Join Date: Nov 2001	http://sound.westhost.com/project3a.htm is that a good amp design and if it is could some one list all the comnpontents i wouold nee for it?

30th November 2001, 06:22 AM	#8
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	That's a good choice. If you order the circuit boards you will get a parts list. Otherwise, just write them down from the circuit diagram.

30th November 2001, 07:18 AM	#9
Micah diyAudio Member Join Date: Nov 2001	i will make a board my self i find it a little diffcult to read those numbers, could and ony write them done for me please? along with what part they are (r1,r3,c1....) Many Many thanks to whoever dose it. also i am thinking of making 5 of them for each speaker, will i have to make 5 PS's for them or will one do and how many amps will the input of 240v ac pull for them all?? as i can only pull a max of 20amps off my power sockets

1st December 2001, 02:41 AM	#10
Micah diyAudio Member Join Date: Nov 2001	ok i got a parts list but have to following probs A. i can't find anyone with the Q7 and Q8 (A1302 and C3281) transitors in New Zealand B. what is T1 in the PS design he gives? or dose anyone have access to a good +/- 35v PS design (240v AC 50hz)???