lm3875t? or lm3875tf

[karma]

im sure some one has talked about it but i cant find it witch one is better isolated or non im about to order samples.

thanks.........🙂

 

[Peter Daniel]

Although I've been using non-isolated version mostly, my recent experiments indicate that isolated version sounds smoother and less harsh. I would recommend isolated version and that's what I'm using from now.

 

[tiroth]

You are also saving yourself a world of mounting concerns with the isolated. 😉

 

[karma]

thanks

now that i got this case together i wana make it a gainclone instead😉

 

[karma]

wow that was fast

national is fast on the shiping i just ordered them😉

 

[jackinnj]

You are also saving yourself a world of mounting concerns with the isolated. 😉

on the other hand, you need a much larger heat sink with the insulated version

 

[Peter Daniel]

I wouldn't think so. The chip transfers less heat to the heatsing, when it's insulated😉

 

[karma]

i got a few to play around with so we shall see. there samples so
if i loose one o well. the heatzincs on my case are from a 200watt
amp so it should keep it cool🙂

 

[Peter Daniel]

The heatsinks on your amp are good for 6 channel surround amp.

 

[karma]

The heatsinks on your amp are good for 6 channel surround amp.

this is true

😀

next one will be smaller

 

[karma]

joygasim

wow now i see the light so much power from such a little ic. and the sound rocks. im sold

the resister for the gain is it 220k or 22k? i used 220k

 

[jackinnj]

I wouldn't think so. The chip transfers less heat to the heatsing, when it's insulated😉

that's not the way the thermodynamics work, the R(t) of the insulation is a barrier has to be added in -- I worked this chart up which illustrates NSM's recommended oC/W ratings (left Y-axis) at various rail voltages (X-axis), P(out) and P(d) are illustrated on the right Y-axis. A lower oC/W is a larger heat sink, in every case the increase is 1 unit of oC/W.

 

[karma]

got some drilling tomorrow. i over did it on the caps o well sound great

any ideas how to buff out scratches on aluminium?

 

[karma]

.

.

 

[ir]

any ideas how to buff out scratches on aluminium?

Brasso

 

[karma]

hmm

ill try it

thanks.........

 

[karma]

power humpty

heres a poor mans power humpty made from a old pc tape drive case..

 

[karma]

.

.

 

[karma]

hmm turned out not to bad for my first time using aluminum.
scraches come out with silvo to. ill finish it all off with a buffer

 

[karma]

.

.