Whatza LA3170? Regular op-amp or sunthin special? Subs? - diyAudio
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Old 21st February 2010, 11:02 PM   #1
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Default Whatza LA3170? Regular op-amp or sunthin special? Subs?

Ola Amigos:

Got a bad LA3170 in an otherwise nice Yamaha tuner.

Thinking (hoping) I can replace it and it's partner straight-up with a burr-brown type op-amp on a brown-dog adapter but can't find a real datasheet for the LA3170 in order to confirm.

Can anybody confirm anything about an LA3170 for me? Is it a simple/straight SIL op-amp with 'normal' pinout so I can drop in another general purpose audio op-amp?

TIA...
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Old 21st February 2010, 11:40 PM   #2
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Attached is a datasheet for the LA3170. It's in Japanese, but you can still read most of the specs and pinout.
Attached Files
File Type: pdf LA3170.pdf (63.9 KB, 33 views)
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Old 22nd February 2010, 12:29 AM   #3
jaycee is offline jaycee  United Kingdom
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Might want to compare it with some of JRC's SIP opamps
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Old 22nd February 2010, 12:38 AM   #4
jaycee is offline jaycee  United Kingdom
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The original is made by Sanyo, and of course discontinued. The pinout doesn't seem to match JRC's sip modules so you will be stuck making an adapter board. What part of the circuit are they in?
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Old 22nd February 2010, 12:46 PM   #5
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Quote:
Originally Posted by jaycee View Post
The original is made by Sanyo, and of course discontinued. The pinout doesn't seem to match JRC's sip modules so you will be stuck making an adapter board. What part of the circuit are they in?
JAYCEE -Thanks for the quick reply and those tips. They're the first stage of audio post MPX, just before a couple of stages of discrete amplification around the low-pass filters. I'll post a pic below of the schem and the unit, just because any thread without graphic illustration is a drag...

Dang, seems pretty clear I can't drop in something. I confirmed from my schem that the pinouts seem to be:
1 - V+
2 - N/C
3 - Inverting Input
4 - Non-inverting Input
5 - V-
6 - compensation?
7 - Output
8 - compensation?

Which is totally different than the JRC's... The Brown Dog adapters are geared towards the JRC modules so if I used those I'd have to cut traces and re-work - not difficult but not as easy as plug & play.

Seems like my choice is either that or go with NOS LA3170's, which I can dig up and obviously would work to get back operating but wouldn't be the upgrade that a modern op-amp conversion would be...

Partial schem snapshot:
Click the image to open in full size.

Full gutshot:
Click the image to open in full size.

Opamp locations:
Click the image to open in full size.
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