Boardman's LM4780 PCBs (merged)

boardman · 22nd April 2004, 11:36 PM

I have designed single sided pc boards for the Lm4780 if anyone is interested. they are 3"X5" in size. One is for the standard stereo circuit, another is for the bridged circuit, and one for the paralell circuit. This chip intriged me, so I thought I'd help others interested. Feel free to email me. Regards, Chauncey

li_gangyi · 23rd April 2004, 08:55 AM

have you actually made some of them?? from what i know...BrianGT is also planning for a group order...check out thw WiKi page...

boardman · 23rd April 2004, 09:31 AM

I have not consructed these boards. I have consructed boards dozens of times, in every configuration using the LM3886. As you know, the pinout is the same Just not as many pins. If you would like to see them I'll post some pictures.

boardman · 23rd April 2004, 01:56 PM

Here is an easy to use pc board designed for the LM4780 including the power supply and mute circuit.

boardman · 23rd April 2004, 04:59 PM

Here is the bridged LM4780 pc board with the power supply and mute circuit.

Peter Daniel · 23rd April 2004, 09:56 PM

Quote:

Originally posted by boardman
Here is the board

Isn't it the same board? So why posting it twice?

How do you plan to mount the chip to the heatsink with this layout?

And what is easy about it? Maybe posting a schematic would explain more?

peranders · 24th April 2004, 06:50 AM

I deleted the duplicate post. Boardman, have you seen the ready pcb from National?

boardman · 24th April 2004, 12:30 PM

Here is the LM4780 parallel board with the power supply and mute circuit included. If anyone needs the files to make your own boards, or want boards made, let me know. For those of you who find soldering this chip intimidating, I can supply a board with the chip allready installed. There is a stereo board and a bridged board allready posted by me and the same goes for them. The specs and schematics for this chip and these boards can be found at the National Semiconductor site. National also offers their own board. It is, in my opinion, a little more than most DIY's want to deal with. Regards CE

Peter Daniel · 24th April 2004, 01:30 PM

Why those aditional bypass caps are mounted so far from the chip? Is it only because they look good (on board) this way?

peranders · 24th April 2004, 02:19 PM

Moderator hat on

boardman, you have started too many threads now about the same thing. Can you explain what your goal is here? How about making schematics, pcb layout and BOM available? I suggest also that you first build a prototype so you know that the pcb really works.

edit by pinkmouse: I have put all these posts into one thread for neatness, and moved it to Chip Amps

22nd April 2004, 11:36 PM	#1
boardman diyAudio Member Join Date: Apr 2004 Location: maryland	LM4780 made easy I have designed single sided pc boards for the Lm4780 if anyone is interested. they are 3"X5" in size. One is for the standard stereo circuit, another is for the bridged circuit, and one for the paralell circuit. This chip intriged me, so I thought I'd help others interested. Feel free to email me. Regards, Chauncey

23rd April 2004, 08:55 AM	#2
li_gangyi diyAudio Member Join Date: Jun 2003 Location: Woodlands Circle	have you actually made some of them?? from what i know...BrianGT is also planning for a group order...check out thw WiKi page... __________________ Kids in the back seat cause accidents...Accidents in the back seat cause kids...

23rd April 2004, 09:31 AM	#3
boardman diyAudio Member Join Date: Apr 2004 Location: maryland	LM4780 I have not consructed these boards. I have consructed boards dozens of times, in every configuration using the LM3886. As you know, the pinout is the same Just not as many pins. If you would like to see them I'll post some pictures.

24th April 2004, 06:50 AM	#7
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	I deleted the duplicate post. Boardman, have you seen the ready pcb from National? __________________ /Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work \|Thread

24th April 2004, 02:19 PM	#10
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Moderator hat on boardman, you have started too many threads now about the same thing. Can you explain what your goal is here? How about making schematics, pcb layout and BOM available? I suggest also that you first build a prototype so you know that the pcb really works. edit by pinkmouse: I have put all these posts into one thread for neatness, and moved it to Chip Amps __________________ /Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work \|Thread


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24th April 2004, 01:30 PM	#9
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Why those aditional bypass caps are mounted so far from the chip? Is it only because they look good (on board) this way?

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