heloo i have two opa541 and two opa549. so can u guys tell me some good but simple schematics that i can use these in. i am an amateur havent built many circuits yet.
i also have a 20-0-20v 5amp transformer.
basically i need it to power a subwoofer. its ok if the schematic doesnt have a low pass filter. just need an amp that can pass frequencies down to 30 hz atleast
i also have a 20-0-20v 5amp transformer.
basically i need it to power a subwoofer. its ok if the schematic doesnt have a low pass filter. just need an amp that can pass frequencies down to 30 hz atleast
hi there nerd,
i really would appriciate if u put it up on ur website.i am kinda new to this stuff.
and also can u tell me wut is a eagle file and which software do i need to open it?
and the amplifier u r talk abt , can it power a subwoofer of 12ohms?
and do u know anything 4 the opa541.
(and please put up the schematic and also the pcb layout)
and if its not too much trouble could u teach me how to print a pcb. u can put it on ur website if u want.
cuz i print boards with the toner transfer method(lazer print the layout on a butter paper and the iron it and transfer it on the copper board and the etch it in fecl3). but 4 that u need a jpg or acrobat file of the layout which is scaled and should be black and white.
i really would appriciate if u put it up on ur website.i am kinda new to this stuff.
and also can u tell me wut is a eagle file and which software do i need to open it?
and the amplifier u r talk abt , can it power a subwoofer of 12ohms?
and do u know anything 4 the opa541.
(and please put up the schematic and also the pcb layout)
and if its not too much trouble could u teach me how to print a pcb. u can put it on ur website if u want.
cuz i print boards with the toner transfer method(lazer print the layout on a butter paper and the iron it and transfer it on the copper board and the etch it in fecl3). but 4 that u need a jpg or acrobat file of the layout which is scaled and should be black and white.
First, I'll get it up on my site soon.
Second, an eagle file is a file that opens in Eagle Layout Editor. You can use the free version (the one I use) to open it. It can be downloaded at www.cadsoft.de
Third, 12 ohms is no problem. In fact, it will run cooler because each chip sees a load of 6 ohm instead of 4 ohm. You willl get slightly less power, but not much.
Fourth, I don't like the OPA541. Every attempt I have made using one has started on fire, because it can't drive 4 ohm speakers as well as the 549 can. It may drive your 12 ohm speaker, but if the impedence drops down during use, you run the risk of the same thing happening. You should be fine with 4 ohm though using your supply, but the OPA549 can supply more current to the speaker.
Finally, you can use the toner transfer method. Using eagle, just disable all layers except bottom and pads (I'm using my new computer to type this and it doesn't have it installed yet. When I install it I will tell you how to get to this menu). Then, put the paper in your laser printer and go to file then print. You don't need to mirror the image, but do choose black and white option and click OK.
After the page comes out you can iron it onto the board and etch.
I have been planning on putting a guide to toner tranfer on my site, so I'll do that too.
Second, an eagle file is a file that opens in Eagle Layout Editor. You can use the free version (the one I use) to open it. It can be downloaded at www.cadsoft.de
Third, 12 ohms is no problem. In fact, it will run cooler because each chip sees a load of 6 ohm instead of 4 ohm. You willl get slightly less power, but not much.
Fourth, I don't like the OPA541. Every attempt I have made using one has started on fire, because it can't drive 4 ohm speakers as well as the 549 can. It may drive your 12 ohm speaker, but if the impedence drops down during use, you run the risk of the same thing happening. You should be fine with 4 ohm though using your supply, but the OPA549 can supply more current to the speaker.
Finally, you can use the toner transfer method. Using eagle, just disable all layers except bottom and pads (I'm using my new computer to type this and it doesn't have it installed yet. When I install it I will tell you how to get to this menu). Then, put the paper in your laser printer and go to file then print. You don't need to mirror the image, but do choose black and white option and click OK.
After the page comes out you can iron it onto the board and etch.
I have been planning on putting a guide to toner tranfer on my site, so I'll do that too.
hey i have orderes 2 opa549 from ti.
i also found a good schematic.
thing is i cam goin to build by pin2pin method (is good to build it this way)
i was plannin to use a simple power supple. 20-0-20v 5amp connected to a rectifier and put a cap in paralel.
will this power supply work if not any better but simple solution.
can u post me a circuit for adding volume control ?
pleaseeee send me ur replies.
i am still amatuer i know i must be soundin really stupid around here but thats the way i'll learn.
i also found a good schematic.
thing is i cam goin to build by pin2pin method (is good to build it this way)
i was plannin to use a simple power supple. 20-0-20v 5amp connected to a rectifier and put a cap in paralel.
will this power supply work if not any better but simple solution.
can u post me a circuit for adding volume control ?
pleaseeee send me ur replies.
i am still amatuer i know i must be soundin really stupid around here but thats the way i'll learn.
Attachments
Hello!!
Here you are pcb OPA541
http://ufo.ds13.agh.edu.pl/~szycha/opa541VAamp.zip
+/- 30V @ 8R Speakers and it works correctly.
OPA541 has 5A conitinous and OPA549 has 8A continous so OPA541 is much better for 8R drivers.
If you plan to make bridge with drv134 better will be 549.
Here you are pcb OPA541
http://ufo.ds13.agh.edu.pl/~szycha/opa541VAamp.zip
+/- 30V @ 8R Speakers and it works correctly.
OPA541 has 5A conitinous and OPA549 has 8A continous so OPA541 is much better for 8R drivers.
If you plan to make bridge with drv134 better will be 549.
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