AND MY very cool design idea!!!! (PIC INCLUDED!!!!)

[pstamler]

My suggestion: Design a nice switching and level-control circuit. Figure out what you need, than lay that out as a block diagram, then turn it into a circuit diagram, then turn that into a panel layout. Add a headphone amp if you like. Leave out the power amplifier; you'll find most producers already have a nice one, probably a Hafler. Or they have powered monitors and don't need one.

Good switching/level control boxes are useful things. Power amps are out there in such numbers that you're really better off applying your learning-time to designing switching stuff. Particularly since a mis-designed power amp will cook your speakers in about 5 sec..

Peace,
Paul

 

[Morning_Star]

Well, I've been doing a lot of searching and I have decided that I'm going to turn it into an input selector with the four channel headphone amps and add a talkback for it. I want it to have two TRS stereo inputs with a RCA input also. I want to still have the Master Gain knob, and three outputs. Two for powered studio monitors A/B compairing and a third one to be routed to an A/B class amp with 50-100W x2 with a A/B output for compairing passive monitors. I think that this will be the easiest way to get my idea to become a reality.

I do have some questions that I couldn't find the answer to though. Does a balanced line amplifier have a balanced signal through out the whole circut or it it just a balanced line that is converted to a simple unbalanced one then back to balanced?

Also what kind of amp circut is used in high end Active monitors? They are thin and would easily fit into a 2U space.

I don't mean to bash your regulars but he was out of line assuming that I was trying to make money off of someone else's work. And I just put a fake company name on the device pic just for fun. You can't accually think that I was just going to start a business selling other peoples designs.

I may be new here but I'm always serious about finishing my projects and I just need help getting started. I will do as much research as I need.

 

[pstamler]

[quote author="Morning_Star"]Well, I've been doing a lot of searching and I have decided that I'm going to turn it into an input selector with the four channel headphone amps and add a talkback for it. I want it to have two TRS stereo inputs with a RCA input also. I want to still have the Master Gain knob, and three outputs. Two for powered studio monitors A/B compairing and a third one to be routed to an A/B class amp with 50-100W x2 with a A/B output for compairing passive monitors. I think that this will be the easiest way to get my idea to become a reality.

I do have some questions that I couldn't find the answer to though. Does a balanced line amplifier have a balanced signal through out the whole circut or it it just a balanced line that is converted to a simple unbalanced one then back to balanced?[/quote]

Usually the latter.

Peace,
Paul

 

[Guest]

I am a relative newbie as well..
But I would approach this in stages (this is my plan)

Build 2 x Gainclones - these can handle (I think) 50W each (PCBs for approx 6 Euros all over the web)
With a manual volume pot
Then add a headphone amp (and combine the PSU to power the gainclone as well)
Then add a remote control volume pot with a LCD read out like Mikkel sells (http://electronics.dantimax.dk/)
Then maybe look at how to get a balanced in instead of an unbalanced in - into the gainclone
And then icing on the cake... add a S/PDIF receiver board instead of balanced in..
And then... think about upgrading the gainclones..

Thats my mini project plan for me... (well I also have lots of monitor, dim and mono stuff in there - a sort of monitor controller come amplifier come headphone amp thing..)

 

[cuelist]

[quote author="Morning_Star"]Also, what about an amplifier design similar to the ones on the Mackie HR824. They are small with alot of power.[/quote]

From my experience, headphone loudness it is more about voltage than power. Most headphones have much higher impedance that loudspeakers.

I would use the convenient "chip amps" like LM3875TF. You can drive them with a +/-24V supply and it is VERY loud even with rather low impedance headphones.

There are a huge amount of chip amp plans on the web, start looking at www.diyaudio.com but don't get trapped in the audiophoolery :green:

 

[Morning_Star]

[quote author="cuelist"]
From my experience, headphone loudness it is more about voltage than power. Most headphones have much higher impedance that loudspeakers.

I would use the convenient "chip amps" like LM3875TF. You can drive them with a +/-24V supply and it is VERY loud even with rather low impedance headphones.

There are a huge amount of chip amp plans on the web, start looking at www.diyaudio.com but don't get trapped in the audiophoolery :green:[/quote]

I ment for the speaker amp. Not the headphone amp.