My newbie design: 2xlm3886 parallel

zafira1981 · 7th February 2006, 03:41 PM

At last, "my" first design, based on lot of reading on this forum.

U2,U4: LM3886T
U3,U5: LF412CN
C2 is optional, that's why the switch.

I choose LF412CN because I cant find the AD8620 here.

U1: that's a problem.
I would like to use AD815, but again, I cant find it in Argentina. My choice is NE5534, but also I can use:

OPA128,OPA234,OPA277,
OPA336,OPA2228,OPA2234,
OPA2277,OPA2604,OPA2681
AD620

The power supply will be 24+24 transf, 8xMUR diodes each one with .1uf in parallel, 1ohm R on each line (like CarlosFM's power supply) and some snubbers. Talking about snubbers, where should I put them??

All chips will have 0.1uf + 100uf for (+) and (-), and U1,U3,U5 will have +- 15 regulated power supply (7815 & 7915)

Comments? advices?
everything is welcome!!!!

zafira1981 · 8th February 2006, 12:59 AM

Ehemm,....

helpppppppppppppppppppppppppppppp

Leolabs · 8th February 2006, 01:06 AM

Why the output stages are inverted???

Are your schematic drawn with Electronic Workbench(or Multisim)???

pinkmouse · 8th February 2006, 01:10 AM

Your font has confused my mac...

zafira1981 · 8th February 2006, 01:30 AM

Quote:

Originally posted by Leolabs
Why the output stages are inverted???

Are your schematic drawn with Electronic Workbench(or Multisim)???

What do you mean with inverted?

yes, I'm using multisim. do you know a better program ? tell me

that's the only one I have

Quote:

Originally posted by pinkmouse
Your font has confused my mac...

I'm really sorry, I will try to fix it or post it like a JPG

pinkmouse · 8th February 2006, 01:35 AM

GIF or PNG are the best formats for schematics. Your PDF should work fine if you use a standard typeface like Times or Helvetica.

zafira1981 · 8th February 2006, 01:35 AM

Here is the GIF version.

zafira1981 · 8th February 2006, 02:58 PM

why nobody answers?

I'm looking for your opinion. good or bad. will work? it's a good project? its a waste of time?

thanks!

lineup · 8th February 2006, 03:13 PM

Quote:

Originally posted by zafira1981
At last, "my" first design, based on lot of reading on this forum.

U2,U4: LM3886T
U3,U5: LF412CN
C2 is optional, that's why the switch.

I choose LF412CN because I cant find the AD8620 here.

U1: that's a problem.
I would like to use AD815, but again, I cant find it in Argentina. My choice is NE5534, but also I can use:

OPA128,OPA234,OPA277,
OPA336,OPA2228,OPA2234,
OPA2277,OPA2604,OPA2681
AD620

The power supply will be 24+24 transf, 8xMUR diodes each one with .1uf in parallel, 1ohm R on each line (like CarlosFM's power supply) and some snubbers. Talking about snubbers, where should I put them??

All chips will have 0.1uf + 100uf for (+) and (-), and U1,U3,U5 will have +- 15 regulated power supply (7815 & 7915)

Comments? advices?
everything is welcome!!!!

'My newbie design: 2xLM3886 parallel'

Hello, zafira1981

As LM4780 is two LM3886 in one IC,
you can have a look in the LM4780 Datasheet

There you have a schematic using a parallel configuration.
See my attachment.
You can also read notes in LM4780 datasheet
about what to think about when paralleling.

zafira1981 · 8th February 2006, 03:30 PM

Quote:

Originally posted by lineup

'My newbie design: 2xLM3886 parallel'

Hello, zafira1981

As LM4780 is two LM3886 in one IC,
you can have a look in the LM4780 Datasheet

There you have a schematic using a parallel configuration.
See my attachment.
You can also read notes in LM4780 datasheet
about what to think about when paralleling.

Hi!!!! thanks for your answer. LM4780 isnt available in my country. only 3886's

But I can take some ideas from the datasheet and apply them to 2 LM3886.

thanks
Jorge.

8th February 2006, 01:35 AM	#6
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	GIF or PNG are the best formats for schematics. Your PDF should work fine if you use a standard typeface like Times or Helvetica. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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8th February 2006, 12:59 AM	#2
zafira1981 diyAudio Member Join Date: Jan 2005 Location: Argentina	Ehemm,.... helpppppppppppppppppppppppppppppp

8th February 2006, 01:06 AM	#3
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Why the output stages are inverted??? Are your schematic drawn with Electronic Workbench(or Multisim)???

8th February 2006, 02:58 PM	#8
zafira1981 diyAudio Member Join Date: Jan 2005 Location: Argentina	why nobody answers? I'm looking for your opinion. good or bad. will work? it's a good project? its a waste of time? thanks!

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