Datasheet Schematic

Wynand · 25th August 2005, 03:00 PM

Can I use the schematic from Figure 1 of LM3876 datasheet to build an amplifier. This is just to get the chip playing.

I've tried another schematic but the amplifier pops so I want to get it going with minimal components.

I will bypass it with 100nF caps.

Ouroboros · 25th August 2005, 03:26 PM

Presuming that you are using symetrical power supplies, then yes, the circuit in fig 1 of the data sheet will work.

100nF should be ok for the Cs (decoupling) capacitors.

Leolabs · 28th August 2005, 02:14 AM

Yes,why not

Wynand · 29th August 2005, 11:06 AM

I got it running. The problem I had was that I was working off ESP's project and it didn't work, so I tried stripping it down to the basics. Still no luck

Turns out when I drew the pcb I didn't connect ground to pin 7.

This happened because when I route It on the PCB I dont route GND but do a copper pour connected to GND.

I'm just happy 'cause it's my first layout of an amplifier.
My previous one was from the datasheet of the TDA2050 chip.

wes-ninja250 · 29th August 2005, 02:32 PM

Wynand: Does your PCB layout software not include the ability to check your board against a netlist, generated from the schematic?

Whenever I make a board, even from somebody else's schematic, I always do the schematic diagram first, then layout the board using the netlist as a guide. I use ExpressPCB, when you click a pin, everything that is supposed to be connected to it turns blue. This also makes board layout MUCH faster.

But ExpressPCB doesn't do copper pours (you have to draw them yourself).

Wes

Wynand · 31st August 2005, 11:28 AM

The Problem was not between The Schematic and the PCB layout software but me just not drawing the connection. As I said, novice/rushing a bit too much.

janneman · 31st August 2005, 11:34 AM

Quote:

Originally posted by Wynand
The Problem was not between The Schematic and the PCB layout software but me just not drawing the connection. As I said, novice/rushing a bit too much.

I think the point he tried to make is that if you use the schematic and use the netlist output from the schematic to do the pcb the connections are AUTOMATICALLY correctly transferred, and you cannot "forget" a connection (or do a wrong one, for that matter).

Jan Didden

25th August 2005, 03:00 PM	#1
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	Datasheet Schematic Can I use the schematic from Figure 1 of LM3876 datasheet to build an amplifier. This is just to get the chip playing. I've tried another schematic but the amplifier pops so I want to get it going with minimal components. I will bypass it with 100nF caps.

29th August 2005, 02:32 PM	#5
wes-ninja250 diyAudio Member Join Date: Feb 2005 Location: Kingston, ON	Wynand: Does your PCB layout software not include the ability to check your board against a netlist, generated from the schematic? Whenever I make a board, even from somebody else's schematic, I always do the schematic diagram first, then layout the board using the netlist as a guide. I use ExpressPCB, when you click a pin, everything that is supposed to be connected to it turns blue. This also makes board layout MUCH faster. But ExpressPCB doesn't do copper pours (you have to draw them yourself). Wes __________________ Do daemons dream of electric sleep()?

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25th August 2005, 03:26 PM	#2
Ouroboros diyAudio Member Join Date: Dec 2003 Location: Nottingham UK	Presuming that you are using symetrical power supplies, then yes, the circuit in fig 1 of the data sheet will work. 100nF should be ok for the Cs (decoupling) capacitors.

28th August 2005, 02:14 AM	#3
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Yes,why not

29th August 2005, 11:06 AM	#4
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	I got it running. The problem I had was that I was working off ESP's project and it didn't work, so I tried stripping it down to the basics. Still no luck Turns out when I drew the pcb I didn't connect ground to pin 7. This happened because when I route It on the PCB I dont route GND but do a copper pour connected to GND. I'm just happy 'cause it's my first layout of an amplifier. My previous one was from the datasheet of the TDA2050 chip.

31st August 2005, 11:28 AM	#6
Wynand diyAudio Member Join Date: Mar 2005 Location: Cape Town	The Problem was not between The Schematic and the PCB layout software but me just not drawing the connection. As I said, novice/rushing a bit too much.

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