Building LM4780 Multichannel Amp

audiocrazy_pune · 6th March 2005, 02:59 PM

Hello Ppl.
Nice 2 meet You People. After Seeing these post i got to know about that 3ch IC. LM4780. I have Ordered the samples. coz i cannot find it in india. I am building my Second amp which is going to be a multichannel Amp. using those LM chips. Hope it would Work. I would like to have the PCB Which is Single Sided. I Did Download the PDF posted by BrainGT. but they are double sided. which i never tried to build one. So i u guys have a single sided PCB design Please post it.

Upupa Epops · 6th March 2005, 03:30 PM

For this chip you can't correct make one sided PCB, pin configuration is too complicated and pin spacing is too small.

audiocrazy_pune · 6th March 2005, 04:42 PM

Opps I dint Think of that. Neways I ll check how to make a double Sided PCB.

psmithmx · 8th March 2005, 01:32 PM

It is possible. I have done it. The only drawback is that you can't always place your external inputs/outputs (speaker, power, input signal) at the edge of the PCB. Edge connections looks better, but placing the connections closer to the pins have other advantages, as less noise, resistance and coupling.

You also have to use 3 links/jumpers on the power to the LM4780. That is the only way to get all the signals and power to the IC without using a double side PCB.

I have also slightly increased the spacing between the two rows of pins. This can easily be done with the real IC. It just leaves a bit more space between the rows to route the tracks.

Hope this helps.
Paul

6th March 2005, 02:59 PM	#1
audiocrazy_pune diyAudio Member Join Date: Aug 2004 Location: pune, india	Building LM4780 Multichannel Amp Hello Ppl. Nice 2 meet You People. After Seeing these post i got to know about that 3ch IC. LM4780. I have Ordered the samples. coz i cannot find it in india. I am building my Second amp which is going to be a multichannel Amp. using those LM chips. Hope it would Work. I would like to have the PCB Which is Single Sided. I Did Download the PDF posted by BrainGT. but they are double sided. which i never tried to build one. So i u guys have a single sided PCB design Please post it.

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6th March 2005, 03:30 PM	#2
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	For this chip you can't correct make one sided PCB, pin configuration is too complicated and pin spacing is too small.

6th March 2005, 04:42 PM	#3
audiocrazy_pune diyAudio Member Join Date: Aug 2004 Location: pune, india	Opps I dint Think of that. Neways I ll check how to make a double Sided PCB.

8th March 2005, 01:32 PM	#4
psmithmx diyAudio Member Join Date: Jan 2005 Location: Pretoria	It is possible. I have done it. The only drawback is that you can't always place your external inputs/outputs (speaker, power, input signal) at the edge of the PCB. Edge connections looks better, but placing the connections closer to the pins have other advantages, as less noise, resistance and coupling. You also have to use 3 links/jumpers on the power to the LM4780. That is the only way to get all the signals and power to the IC without using a double side PCB. I have also slightly increased the spacing between the two rows of pins. This can easily be done with the real IC. It just leaves a bit more space between the rows to route the tracks. Hope this helps. Paul

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