Mini-LM3886 PCB 4 You !!!

Minion · 4th July 2009, 09:19 PM

Hi Folks , I just thought I would share a simple Single sided small LM3886 PCB with you .....

The version is pretty much the Datasheet implementation with no special features or components...

It measures 2 in x 1.3 in and has a single Jumper and is easy to etch at home ....

I just built one and it works perfectly and has no hum even though the Power and signal grounds aren"t seperated .....

Just simple , quick, and dirty .....

Cheers

neeraj · 5th July 2009, 06:59 AM

Hi,

Great Job Man. Thanks for sharing.

Regards

pacificblue · 5th July 2009, 07:01 AM

You can always replace the jumper with a small resistor to separate the grounds.

The 5W 0,5R resistor is only necessary in parallel applications. Rating and resistance are too big and it touches Ci, which does not like heat.

Rin should be connected between Cin and IC, not between input terminal and Cin. The way you laid it out, the filter frequency depends on the IC's input resistance instead of Rin.

Where is Rb?

Space for Cc against Rf disturbances, Rsn/Csn against oscillations and L/R against reactive loading should be provided.

You should also state the biggest possible voltage rating for that design, which will be limited by the size of the 1000 µF capacitors.

sivan_and · 5th July 2009, 08:18 AM

I don't like the layout..the input o/p r so close..kindly change the layout

AndrewT · 5th July 2009, 12:34 PM

I don't like it either.
A very poor implementation that ignores much of National's advice.

Minion · 5th July 2009, 03:13 PM

Well I never claimed it to be a Good design , it is at the very best Functional .....

I Forgot about Rb so I soldered it on the bottom of the board but worked the same without it ......

Kay · 5th July 2009, 03:42 PM

Quote:

I don't like the layout.

do you like this?

sivan_and · 5th July 2009, 04:44 PM

Minion:

Quote:

Well I never claimed it to be a Good design , it is at the very best Functional .....

Might oscillate, if the speaker out is so close to the input, and the absence of "Zobel" might make it worse or good as an AF oscillator

sivan_and · 5th July 2009, 04:47 PM

Kay:

Quote:

you like this?

can't say with a single glance

but seems to be colorful !!

Efficient design (better use of copper)

4th July 2009, 09:19 PM	#1
Minion diyAudio Member Join Date: May 2006	Mini-LM3886 PCB 4 You !!! Hi Folks , I just thought I would share a simple Single sided small LM3886 PCB with you ..... The version is pretty much the Datasheet implementation with no special features or components... It measures 2 in x 1.3 in and has a single Jumper and is easy to etch at home .... I just built one and it works perfectly and has no hum even though the Power and signal grounds aren"t seperated ..... Just simple , quick, and dirty ..... Cheers

5th July 2009, 06:59 AM	#2
neeraj diyAudio Member Join Date: Dec 2005 Location: New delhi	Hi, Great Job Man. Thanks for sharing. Regards __________________ Neeraj

5th July 2009, 07:01 AM	#3
pacificblue diyAudio Member Join Date: May 2008	You can always replace the jumper with a small resistor to separate the grounds. The 5W 0,5R resistor is only necessary in parallel applications. Rating and resistance are too big and it touches Ci, which does not like heat. Rin should be connected between Cin and IC, not between input terminal and Cin. The way you laid it out, the filter frequency depends on the IC's input resistance instead of Rin. Where is Rb? Space for Cc against Rf disturbances, Rsn/Csn against oscillations and L/R against reactive loading should be provided. You should also state the biggest possible voltage rating for that design, which will be limited by the size of the 1000 µF capacitors. __________________ If you've always done it like that, then it's probably wrong. (Henry Ford)

5th July 2009, 12:34 PM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	I don't like it either. A very poor implementation that ignores much of National's advice. __________________ regards Andrew T.

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5th July 2009, 03:13 PM	#6
Minion diyAudio Member Join Date: May 2006	Well I never claimed it to be a Good design , it is at the very best Functional ..... I Forgot about Rb so I soldered it on the bottom of the board but worked the same without it ......

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