i want a simple circuit to take the two outputs from my power amplifier (60w max), add them (or whatever you want to call it) and give me an output for a subwoofer.
thanks in advance for any help.
thanks in advance for any help.
Well,
In that case, and if you want a summing signal, just add 3 resistors and other amplifier.
at least 100k in each output of the main amplifier, join this 2 with another of 22k and then to ground.
you get the summing signal between the 2 extremes of the 22k resistor.
now, with this, you'll put into the subwoofer 🙄 all the audio bandwidth. this signal is applyed to a third amplifier and...
some sound will get out of the sub.
more simple tan this, is impossible...
You can also put in parallel with the 22k resistor a 470nF cap to make a low pass filter.
I'd like to make a remark here:
This is the worst way to do this, but I'm answering to your question.😉
Another way is to buy a dual coil subwoofer and make a good low pass filter.
Pedro Martins
In that case, and if you want a summing signal, just add 3 resistors and other amplifier.
at least 100k in each output of the main amplifier, join this 2 with another of 22k and then to ground.
you get the summing signal between the 2 extremes of the 22k resistor.
now, with this, you'll put into the subwoofer 🙄 all the audio bandwidth. this signal is applyed to a third amplifier and...
some sound will get out of the sub.
more simple tan this, is impossible...
You can also put in parallel with the 22k resistor a 470nF cap to make a low pass filter.
I'd like to make a remark here:
This is the worst way to do this, but I'm answering to your question.😉
Another way is to buy a dual coil subwoofer and make a good low pass filter.Pedro Martins
audioPT said:Well,
In that case, and if you want a summing signal, just add 3 resistors and other amplifier.
at least 100k in each output of the main amplifier, join this 2 with another of 22k and then to ground.
you get the summing signal between the 2 extremes of the 22k resistor.
now, with this, you'll put into the subwoofer 🙄 all the audio bandwidth. this signal is applyed to a third amplifier and...
some sound will get out of the sub.
more simple tan this, is impossible...
You can also put in parallel with the 22k resistor a 470nF cap to make a low pass filter.
I'd like to make a remark here:
This is the worst way to do this, but I'm answering to your question.😉
Pedro Martins
like this?
Attachments
just made this ...
built this about 2 days ago and works perfectly. -3db is 70hz for subwoofer bass. i used 741s just as testing but better op amps should be chosen. the 3.9ohm load represents the speaker.
-chris
built this about 2 days ago and works perfectly. -3db is 70hz for subwoofer bass. i used 741s just as testing but better op amps should be chosen. the 3.9ohm load represents the speaker.
An externally hosted image should be here but it was not working when we last tested it.
-chris
thanks, where can i find a simple low pass filter as well? what would a suitable value for the low pass filter be? 100Hz?
audioPT said:
is the 1uf capacitor the low pass filter or do i add a 470nf as well? or do i use a 470nf one instead of the 1uf?
😕 Well, as this is NOT the best way, you can use your ears and tune this up.
Try various values until you get the desired sound.
Pedro Martins
Try various values until you get the desired sound.
Pedro Martins
Well,
Start over 470nF.
Just add 100nF in parallel for testing the better sound.
470+100=570
470+100+100=670
...
470+100+100+100+100+100+100+100+100+100=1.47uF
Pedro Martins
Start over 470nF.
Just add 100nF in parallel for testing the better sound.
470+100=570
470+100+100=670
...
470+100+100+100+100+100+100+100+100+100=1.47uF
Pedro Martins
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