Adding Vol Port to this LM3886 Circuit!

FREQUENCY · 6th March 2005, 06:45 AM

Hi all,

I would like to know how to add a vol port to this circuit!

I was think adding a 100k vol port on. Is that ok!

1) what value of the vol port is suitable for this circuit!
and how should I connect them up?

Cheers,
Frequency

Tube_Dude · 6th March 2005, 07:17 AM

Quote:

Originally posted by FREQUENCY
Hi all,

I would like to know how to add a vol port to this circuit!

I was think adding a 100k vol port on. Is that ok!

Is better to use a 10K or 20K volume pot , unless you have a valve output source (high impedance output) .

Quote:

how should I connect them up?

The middle terminal of the pot , to the input 4,7 uF cap , one of the other terminal to the input ground and the other become the "new" input of the amplifier.

Cheers

sivan_and · 6th March 2005, 08:27 AM

The .1mfd capacitor in the signal path to ground will roll off much treble and the value should be reduced to less than 1Kpf.

FREQUENCY · 6th March 2005, 09:49 AM

hey, sivan_and

You mean the cap 0.1uf after 4.7uf cap should be less than 1Kpf.
(the 0.1uf cap before 1k resistor) or both the 0.1uf cap along the signal.

Sivan_and quote:

(The .1mfd capacitor in the signal path to ground will roll off much treble and the value should be reduced to less than 1Kpf.)

One more question: the port should be LINEAR type RIGHT!.

Thank All!

Cheers,
Frequency

sivan_and · 6th March 2005, 01:17 PM

the cap 0.1uf after 4.7uf cap should be less than 1Kpf.
(the 0.1uf cap before 1k resistor) not both .........

Volume pot should be Log...

FREQUENCY · 7th March 2005, 02:38 AM

Hi all,

Thank you for all the information!

cheers,
Frequency

FREQUENCY · 7th March 2005, 02:38 AM

Hi All,

If there is any inprovement on this circuit just chip!

Thank you!

Cheers,
Frequency

sivan_and · 7th March 2005, 03:13 AM

Mute pin not biased....Study data sheet.......

FREQUENCY · 7th March 2005, 06:35 AM

hi siva_and,

I had not gone into the data sheet!

biased the mute pin will get the mute funtion???

what can the mute pin help by biasing them?

cheers,
Frequency

sivan_and · 7th March 2005, 01:00 PM

Lots of posts in this forum...

or here : http://www.national.com/ds.cgi/LM/LM3886.pdf

6th March 2005, 08:27 AM	#3
sivan_and diyAudio Member Join Date: Dec 2004 Location: Dxb / India	The .1mfd capacitor in the signal path to ground will roll off much treble and the value should be reduced to less than 1Kpf. __________________ SivanandBalan

7th March 2005, 03:13 AM	#8
sivan_and diyAudio Member Join Date: Dec 2004 Location: Dxb / India	Mute pin not biased....Study data sheet....... __________________ SivanandBalan

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Adding Subwoofer output to Aikido preamp circuit	dr._sleep	Tubes / Valves	5	13th November 2007 04:18 PM
Modding a XR45: adding USB port.	antorsae	Digital Source	4	1st February 2006 04:21 PM
How to add Vol port to this circuit!	FREQUENCY	Chip Amps	1	6th March 2005 07:38 PM
Adding a Port to my enclosure	Maples	Multi-Way	6	26th July 2004 06:29 AM
Adding a port	Howard	Multi-Way	35	15th August 2003 09:06 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

6th March 2005, 09:49 AM	#4
FREQUENCY diyAudio Member Join Date: Mar 2005 Location: North-East	hey, sivan_and You mean the cap 0.1uf after 4.7uf cap should be less than 1Kpf. (the 0.1uf cap before 1k resistor) or both the 0.1uf cap along the signal. Sivan_and quote: (The .1mfd capacitor in the signal path to ground will roll off much treble and the value should be reduced to less than 1Kpf.) One more question: the port should be LINEAR type RIGHT!. Thank All! Cheers, Frequency

7th March 2005, 02:38 AM	#6
FREQUENCY diyAudio Member Join Date: Mar 2005 Location: North-East	Hi all, Thank you for all the information! cheers, Frequency

7th March 2005, 06:35 AM	#9
FREQUENCY diyAudio Member Join Date: Mar 2005 Location: North-East	hi siva_and, I had not gone into the data sheet! biased the mute pin will get the mute funtion??? what can the mute pin help by biasing them? cheers, Frequency

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)