What LM3875 to buy?

AJ Bertelson · 30th December 2003, 04:06 PM

http://www.newark.com/NewarkWebComme...LM3875&x=0&y=0

I am about to pull the trigger on getting the gainclone parts together but I witch chip should I buy?

Magnetmaz · 30th December 2003, 05:12 PM

when i built my gainclone i just ordered free samples from National semi.....didn't even have to pay for shipping.

http://www.national.com/pf/LM/LM3875.html

I got 10 of the LM3875TF

That was sorta cheap of me, though, and i don't highly advise it to people who make moral dilemnas out of everything

-Maz

AJ Bertelson · 30th December 2003, 07:31 PM

Yea I was thinking of going though NS but I remember seeing a 8-10 week lead time.

elizard · 30th December 2003, 08:43 PM

I recommend the TF
The T is a non-isolated chip, while the TF is the isolated version of the lm chip.

Gainclone doesn't run hot anyway, so you won't have much problems w/ heat dissipation, and using a non-isolated chip only adds the headache of making sure its isolated from the heatsink.

Magnetmaz · 30th December 2003, 08:55 PM

in regards to the lead time, NS lets you choose which of their distributors you wish to recieve the chips from. I chose arrow and got them in 1-2 weeks.

-Maz

elizard · 30th December 2003, 09:17 PM

http://www.digikey.com/scripts/DkSea...247941&Site=US

no lead time ..

neutron7 · 31st December 2003, 07:27 AM

The "f" version is isolated, I take it that means that you can bolt (2 of them) directly to the heatsink even if it is connected to ground.

skyraider · 17th January 2004, 06:34 PM

just wondering, how really good is a gaincard compared to those megabucks amp?

elizard · 17th January 2004, 08:01 PM

Quote:

Originally posted by neutron7
The "f" version is isolated, I take it that means that you can bolt (2 of them) directly to the heatsink even if it is connected to ground.

that's correct

Quote:

Originally posted by skyraider
just wondering, how really good is a gaincard compared to those megabucks amp?

Yeech, do a search through the chip amp forum and you'll find many people who argue back and forth.

All I can say is that a gainclone has a surprising sound (when you look at it you think to yourself "THIS is going to make sound???")

peranders · 17th January 2004, 10:10 PM

Quote:

Originally posted by neutron7
The "f" version is isolated, I take it that means that you can bolt (2 of them) directly to the heatsink even if it is connected to ground.

The look like this:

30th December 2003, 04:06 PM	#1
AJ Bertelson diyAudio Member Join Date: Jan 2003 Location: Maple Grove, MN	What LM3875 to buy? http://www.newark.com/NewarkWebComme...LM3875&x=0&y=0 I am about to pull the trigger on getting the gainclone parts together but I witch chip should I buy?

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30th December 2003, 05:12 PM	#2
Magnetmaz diyAudio Member Join Date: Nov 2002 Location: Pittsburgh, PA	when i built my gainclone i just ordered free samples from National semi.....didn't even have to pay for shipping. http://www.national.com/pf/LM/LM3875.html I got 10 of the LM3875TF That was sorta cheap of me, though, and i don't highly advise it to people who make moral dilemnas out of everything -Maz

30th December 2003, 07:31 PM	#3
AJ Bertelson diyAudio Member Join Date: Jan 2003 Location: Maple Grove, MN	Yea I was thinking of going though NS but I remember seeing a 8-10 week lead time.

30th December 2003, 08:43 PM	#4
elizard diyAudio Member Join Date: Mar 2003 Location: Winnipeg, MB	I recommend the TF The T is a non-isolated chip, while the TF is the isolated version of the lm chip. Gainclone doesn't run hot anyway, so you won't have much problems w/ heat dissipation, and using a non-isolated chip only adds the headache of making sure its isolated from the heatsink.

30th December 2003, 08:55 PM	#5
Magnetmaz diyAudio Member Join Date: Nov 2002 Location: Pittsburgh, PA	in regards to the lead time, NS lets you choose which of their distributors you wish to recieve the chips from. I chose arrow and got them in 1-2 weeks. -Maz

30th December 2003, 09:17 PM	#6
elizard diyAudio Member Join Date: Mar 2003 Location: Winnipeg, MB	http://www.digikey.com/scripts/DkSea...247941&Site=US no lead time ..

31st December 2003, 07:27 AM	#7
neutron7 diyAudio Member Join Date: Dec 2003 Location: Toronto Canada	The "f" version is isolated, I take it that means that you can bolt (2 of them) directly to the heatsink even if it is connected to ground.

17th January 2004, 06:34 PM	#8
skyraider diyAudio Member Join Date: Jan 2004 Location: malaysia	just wondering, how really good is a gaincard compared to those megabucks amp?

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