LM3886 Schematics + PCB - Page 8

AndrewT · 1st February 2012, 05:44 PM

Measure the output of your

Quote:

mobile headphone out

Tell us the gain of your 3886 amplifier.

Go read system gain article.

apexaudio · 1st February 2012, 06:47 PM

Quote:

Originally Posted by yugaaa

Tried the circuit . I am happy with the result , though i find that the volume level is not good enough . Dosent sound like a 60w amp . Does the circuit need a pre amp ? I connected it directly to a mobile headphone out . sounds like a 5 watt amplifier

Increase feedback resistor 15k to 33k for increase gain.

yugaaa · 11th February 2012, 03:21 PM

I wanted to try out the amp .. so i had to use anything that was avaliable and it was my phone .

Yes , i did increase the gain by increasing the resistor value , but it i feel the sound is not as good as it is when using the 15k resistor . Still testing though since i made 4 modules for bridging into stereo . Will update as soon as it is done .

yugaaa · 17th February 2012, 03:14 AM

Here is my amp .. 4 modules done and working .. Now , in a fix as to how to bridge the amp . Do i use an external bridge circuit ?

udailey · 17th February 2012, 12:40 PM

check AN-1192. http://www.ti.com/lit/an/snaa021a/snaa021a.pdf

17th February 2012, 12:40 PM	#75
udailey Passive Aggressive diyAudio Member Join Date: Mar 2008	check AN-1192. http://www.ti.com/lit/an/snaa021a/snaa021a.pdf __________________ You can purchase LDRs anytime to build a standard LDR attenuator or to build my new LDR Attenuator "A Lighter Note". Email me. diyldr@gmail.com

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11th February 2012, 03:21 PM	#73
yugaaa diyAudio Member Join Date: Jan 2002 Location: india	I wanted to try out the amp .. so i had to use anything that was avaliable and it was my phone . Yes , i did increase the gain by increasing the resistor value , but it i feel the sound is not as good as it is when using the 15k resistor . Still testing though since i made 4 modules for bridging into stereo . Will update as soon as it is done .

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