Lm3886 question

[diy didi]

Hi.
Can Someone tell me what the function of the 270 ohm 2W resistor is on the output of the LM3886?

 

[tomchr]

At first glance, it looks like the on-board heater... 🙂

Could it be compensating for a load that goes very high impedance at some frequency?

Tom

 

[leadbelly]

Hi.
Can Someone tell me what the function of the 270 ohm 2W resistor is on the output of the LM3886?

Why why why be so cryptic? What is it? Do you own it? Do you have another diagram with connector printout? Do you know what outputs the device actually has?

 

[Stuey]

Headphone out?

 

[Max Headroom]

Why why why be so cryptic? What is it? Do you own it? Do you have another diagram with connector printout? Do you know what outputs the device actually has?

Wise men speak because they have something to say; Fools because they have to say something. Plato

Indeed.

 

[Max Headroom]

Hi.
Can Someone tell me what the function of the 270 ohm 2W resistor is on the output of the LM3886?

It is a DC load, not strictly necessary but would reduce startup thump.
Dan.

 

[tomchr]

Adding load to the LM3886 won't do anything to reduce any start-up thump. The LM3886 doesn't have much of a start-up thump anyway if you're using the mute circuit given in the data sheet and size the mute resistor properly. My LM3886 amps all start up quietly.

Tom

 

[adason]

Headphone out?

Not the way its connected. It would have to be disconnected from ground.

 

[BrianL]

This appears to be a schematic for one channel of power amplifier in an Allen electronic organ. Speakers are almost always some distance from the console which usually contains the amps. Apparently they wanted to always have some minimal load on the output even if the speakers were disconnected. I don't know why but it likely doesn't hurt anything