What's a LM3180p ?

dynoPort · 19th April 2009, 12:46 PM

8 pin (4 each side) in a Musical Fidelity P270/2 power amp can't find any reference to it in a web search! there is one per channel, also marked N8819 on one, N8827 on the other.

And would there be a newer (better?!) version. Thanks.

Nisbeth · 19th April 2009, 04:37 PM

I get some cross-reference hits to CA3180 which I believe is a VCA (Voltage-controlled amplifier) but unfortunately no datasheet

/U.

mjf · 19th April 2009, 05:25 PM

hello.
perhaps a lm 318.
greetings...........

mjf · 19th April 2009, 06:26 PM

if i am not totally wrong the mf a370 uses a lm 318, a fast bipolar opamp.
greetings..........

dynoPort · 19th April 2009, 06:38 PM

Could be OP not zero -p OP for op-amp!

if this is indeed what it is and it makes sense would there be a better alternative these days?

mjf · 19th April 2009, 06:57 PM

...........better - yes and no.
because this is a special fast precision opamp and i think it is part of the (sound)design...........
but if you want to do some experiments you can find some other opamps.have a look at the lm 318 datasheet.........take care of oscillations if you change something.
greetings..................

Apex Jr · 19th April 2009, 08:04 PM

Quote:

Originally posted by dynoPort

also marked N8819 on one, N8827 on the other.

These numbers are date codes, 19th week of 1988
along with the 27th week of 1988.
Only have to fiqure out the LM 3180P

Steve @ Apex Jr.

raudio1969 · 21st April 2009, 02:36 AM

Can you post a photo of the part? Maybe someone will recognize a logo? Could it be an old Signetics part?

gmphadte · 21st April 2009, 10:51 AM

3180 is a VCA
try THAT Corp but I doubt u will find any direct replacements

Nisbeth · 21st April 2009, 06:57 PM

LM-parts are made by National but that might not be the case in 1988. Can't remember what CA was.

/U.

19th April 2009, 12:46 PM	#1
dynoPort diyAudio Member Join Date: Oct 2004 Location: Cymru/Wales	What's a LM3180p ? 8 pin (4 each side) in a Musical Fidelity P270/2 power amp can't find any reference to it in a web search! there is one per channel, also marked N8819 on one, N8827 on the other. And would there be a newer (better?!) version. Thanks.

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19th April 2009, 04:37 PM	#2
Nisbeth diyAudio Member Join Date: Jan 2001 Location: Denmark	I get some cross-reference hits to CA3180 which I believe is a VCA (Voltage-controlled amplifier) but unfortunately no datasheet /U.

19th April 2009, 05:25 PM	#3
mjf diyAudio Member Join Date: Jan 2009 Location: upper austria/near linz	hello. perhaps a lm 318. greetings...........

19th April 2009, 06:26 PM	#4
mjf diyAudio Member Join Date: Jan 2009 Location: upper austria/near linz	if i am not totally wrong the mf a370 uses a lm 318, a fast bipolar opamp. greetings..........

19th April 2009, 06:38 PM	#5
dynoPort diyAudio Member Join Date: Oct 2004 Location: Cymru/Wales	Could be OP not zero -p OP for op-amp! if this is indeed what it is and it makes sense would there be a better alternative these days?

19th April 2009, 06:57 PM	#6
mjf diyAudio Member Join Date: Jan 2009 Location: upper austria/near linz	...........better - yes and no. because this is a special fast precision opamp and i think it is part of the (sound)design........... but if you want to do some experiments you can find some other opamps.have a look at the lm 318 datasheet.........take care of oscillations if you change something. greetings..................

21st April 2009, 02:36 AM	#8
raudio1969 diyAudio Member Join Date: Sep 2007 Location: N38	Can you post a photo of the part? Maybe someone will recognize a logo? Could it be an old Signetics part?

21st April 2009, 10:51 AM	#9
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	3180 is a VCA try THAT Corp but I doubt u will find any direct replacements

21st April 2009, 06:57 PM	#10
Nisbeth diyAudio Member Join Date: Jan 2001 Location: Denmark	LM-parts are made by National but that might not be the case in 1988. Can't remember what CA was. /U.

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