Chipamp buffer / filter

Nordic · 22nd January 2006, 01:37 PM

My efforts in revivng the blown yahama sub continues...
Today I completed the amp part and PSU... it played first time... NO HUM yeay...

I want to type this ten times, but I'll just do it in bold....
MAKE SURE YOUR CIRCUIT IS MECHANICALY SOUND...
I can not believe how much more confident I feel in my latest clone... veroboard and all, it should surfive inside the sub without issues... I was so happy to find just the right size wire yesterday for the job, and had 1 small thin piece to go from the input to the SGS... worked like magic...

I have played with making a basic low pass filter using a 741 opamp... yeh it sounds crude, but I just wanted to check that it works etc. (first timer).

My amp is an Inverted GC (ala Nuuk style), so I need a buffer... I got a spare NE5532, which I played with in the week so can someone just confirm that....;

1) I can use one half of the IC for a buffer and the other half for a filter, asif it is 2 ICs?

2) Could you guys please give my proposed circuit a once over...
The goal is just for it to drive a small sub, if I calculated right, it should cut off at 96Hz

I'm sure you guys can help me improve it before I waste more veroboard... the day has been going so well, electronicaly speaking!

Nordic · 23rd January 2006, 01:46 AM

bump?

lineup · 23rd January 2006, 02:29 AM

Looks pefectly alright to me.
7500 Ohm and 220nF gives -3dB cutoff at 96 Hertz.

In these filters if possible, is good to keep those two resistors
between 4.7-10 kOhm in value, and select those caps to set frequency.
Your 7.5k are just right.

If in case you need, you can put in some little gain in first OP.

Nordic, you are not likely to get many replies
when people cant find anything to critic or complain about.
(put in a couple of bad errors in your circuit, and you'll see what I mean)

Nordic · 23rd January 2006, 06:10 AM

Thanx for the confidence boost... I was about to just put it all together and see if it works....

Opamps are fun... can't believe what I have been missing out on.. If I wan't this old I would go and study electronics...

Will skip on the extra gain for now, as my CD player puts out quite a heavy duty signal it would seem.

Wynand · 23rd January 2006, 10:19 AM

I saw you had the greenies the other day.

That plus your age issue .... wait is that you on your avatar???

rudi · 23rd January 2006, 12:55 PM

nee die bliksem maak net asof hy so gerook is of so oud is

Nordic · 23rd January 2006, 01:47 PM

Seedless, allie pad vannie Kai af my baas.

Wynand · 23rd January 2006, 01:59 PM

En die manne van die kaap sê dis duuuuiiiidelik!!!

Nordic · 24th January 2006, 06:33 PM

What would be a good range for resistors to go for 3 x gain?

BTW the circuit works just fine... I just want to counter some of the losses in the Hafler circuit.

carlosfm · 24th January 2006, 10:59 PM

You may want to download Filter Pro from www.ti.com

With gain of 3:

22nd January 2006, 01:37 PM	#1
Nordic diyAudio Member Join Date: Sep 2005	Chipamp buffer / filter My efforts in revivng the blown yahama sub continues... Today I completed the amp part and PSU... it played first time... NO HUM yeay... I want to type this ten times, but I'll just do it in bold.... MAKE SURE YOUR CIRCUIT IS MECHANICALY SOUND... I can not believe how much more confident I feel in my latest clone... veroboard and all, it should surfive inside the sub without issues... I was so happy to find just the right size wire yesterday for the job, and had 1 small thin piece to go from the input to the SGS... worked like magic... I have played with making a basic low pass filter using a 741 opamp... yeh it sounds crude, but I just wanted to check that it works etc. (first timer). My amp is an Inverted GC (ala Nuuk style), so I need a buffer... I got a spare NE5532, which I played with in the week so can someone just confirm that....; 1) I can use one half of the IC for a buffer and the other half for a filter, asif it is 2 ICs? 2) Could you guys please give my proposed circuit a once over... The goal is just for it to drive a small sub, if I calculated right, it should cut off at 96Hz I'm sure you guys can help me improve it before I waste more veroboard... the day has been going so well, electronicaly speaking!

23rd January 2006, 02:29 AM	#3
lineup diyAudio Member Join Date: Dec 2005 Location: the north	Looks pefectly alright to me. 7500 Ohm and 220nF gives -3dB cutoff at 96 Hertz. In these filters if possible, is good to keep those two resistors between 4.7-10 kOhm in value, and select those caps to set frequency. Your 7.5k are just right. If in case you need, you can put in some little gain in first OP. Nordic, you are not likely to get many replies when people cant find anything to critic or complain about. (put in a couple of bad errors in your circuit, and you'll see what I mean) __________________ lineup

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23rd January 2006, 01:46 AM	#2
Nordic diyAudio Member Join Date: Sep 2005	bump?

23rd January 2006, 06:10 AM	#4
Nordic diyAudio Member Join Date: Sep 2005	Thanx for the confidence boost... I was about to just put it all together and see if it works.... Opamps are fun... can't believe what I have been missing out on.. If I wan't this old I would go and study electronics... Will skip on the extra gain for now, as my CD player puts out quite a heavy duty signal it would seem.

23rd January 2006, 10:19 AM	#5
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	I saw you had the greenies the other day. That plus your age issue .... wait is that you on your avatar???

23rd January 2006, 12:55 PM	#6
rudi diyAudio Member Join Date: Jul 2004 Location: .	nee die bliksem maak net asof hy so gerook is of so oud is

23rd January 2006, 01:47 PM	#7
Nordic diyAudio Member Join Date: Sep 2005	Seedless, allie pad vannie Kai af my baas.

23rd January 2006, 01:59 PM	#8
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	En die manne van die kaap sê dis duuuuiiiidelik!!!

24th January 2006, 06:33 PM	#9
Nordic diyAudio Member Join Date: Sep 2005	What would be a good range for resistors to go for 3 x gain? BTW the circuit works just fine... I just want to counter some of the losses in the Hafler circuit.

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