4136 opamp replacement

[antichef]

OK - I started a thread in "the rack" about an old EQ unit I'm working on. It uses 4136CP opamps, and they kind of suck. Since we now have this forum, I'll post my now-more-specific question here.

I found this:

http://www.cimarrontechnology.com/in...PROD&ProdID=35

this is an adapter which "Adapts two SO8 dual op-amps to RC4136 quad op-amp footprint (14-pin DIP)."

What's confusing me is that I still see 14 holes on the top of the adapter, so I'm having a hard time picturing two identical ICs plugged into it (unless each has a single line of 7 pins).

the question -- um, what's a SO8 dual opamp? Any recommendations as to which one(s) would be a good replacement?

[Somnium7]

Originally Posted by antichef

the question -- um, what's a SO8 dual opamp? Any recommendations as to which one(s) would be a good replacement?

SO8 is a surface mount technology package type. I would avoid it unless you have very steady hands and good eyes.

That adapter is meant to replace a DIP package - not what you need.

[mshilarious]

Originally Posted by antichef

OK - I started a thread in "the rack" about an old EQ unit I'm working on. It uses 4136CP opamps, and they kind of suck. Since we now have this forum, I'll post my now-more-specific question here.

I found this:

http://www.cimarrontechnology.com/in...PROD&ProdID=35

this is an adapter which "Adapts two SO8 dual op-amps to RC4136 quad op-amp footprint (14-pin DIP)."

What's confusing me is that I still see 14 holes on the top of the adapter, so I'm having a hard time picturing two identical ICs plugged into it (unless each has a single line of 7 pins).

the question -- um, what's a SO8 dual opamp? Any recommendations as to which one(s) would be a good replacement?

SO8 is surface mount. You probably don't want to mess with that. I assume your 4136 is DIP-14? You don't need an adaptor. How about 5534 as a replacement?

[Somnium7]

I believe he is dealing with the SIP version. This would be more useful...
http://www.capitaladvanced.com/9000ser.htm

But again SMT...

Between a rock and hard place i think.

[antichef]

oh jeez thanks - I guess that's what those 8 little pads are for

The reason I think I need an adapter is this quote:

"The supply pins are different to most common quad opamps you will come across so you can't just swap directly. On the 4136 pin 11 was positive and pin 7 negative."

from this thread: http://www.diyaudio.com/forums/showt...hreadid=120496 (I'm not a member over there )

could this mean I'm doomed? I should have said that the 4136CPs are nicely socketed in 14pin sockets now.

[mshilarious]

Originally Posted by Somnium7

I believe he is dealing with the SIP version. This would be more useful...
http://www.capitaladvanced.com/9000ser.htm

But again SMT...

Between a rock and hard place i think.

Ooooh, SIPs, eh? Is that right, anti? I have some SIP 5532s laying around, but not 5534s, there are hardly any SIPs left these days. Hard to find, anyway. And if this opamp does have a strange pinout, the adaptor boards will have to have traces cut and jumped . . . this is gonna be quite a project!

Edit: for some strange reason I thought 5534 was quad not single . . . yeah, probably go with one of those adaptor board and reroute the traces, I had a look at the 4136 pinout and it is waaay different. . . SMT work isn't that hard, it's rework that's a bitch. You'll need a good iron and a flux pen though.

[antichef]

dang it, my ignorance condition is acting up again -- the existing opamps are not surface mount - they have 14 pins in two rows and are sitting prettily in 14 pin sockets, begging to be plucked out by my chip puller.

(hopefully that's clear -- I'll post an out-of-focus picture as soon as it gets from my phone to my blog)

edit: here's the pic:

[mshilarious]

Originally Posted by antichef

dang it, my ignorance condition is acting up again -- the existing opamps are not surface mount - they have 14 pins in two rows and are sitting prettily in 14 pin sockets, begging to be plucked out by my chip puller.

(hopefully that's clear -- I'll post an out-of-focus picture as soon as it gets from my phone to my blog)

edit: here's the pic:

Those are DIPs. You still have the pinout problem.

[antichef]

thanks! -- so I either need to find an adapter like the one I linked to, but that supports a DIP, or make one or something like that.

[mshilarious]

Originally Posted by antichef

thanks! -- so I either need to find an adapter like the one I linked to, but that supports a DIP, or make one or something like that.

And cut and jump most all of the traces . . . how much do you love this box, anyway?

[antichef]

good point -- but it's the journey, not the destination that I have in mind. Anyway, thanks! I'll update this thread at some point if/when I make some progress.

[Somnium7]

Before you start cutting traces check this out.

http://www.larsenassociates.com/ariesadapterlist.html

Part # 18046

I used to work for that company back in the way back days and don't care to recommend them to anybody for personal reasons but that particular adapter is exactly what you need.
I'm sure they can point you to a distributer for purchasing or you can ask them for some free samples

[antichef]

wow -thanks! I'll get in touch with them.

Assuming I get some of those, any recommendation for a 14 pin DIP quad op-amp to replace those old clunkers? The 5534 is single?

[mshilarious]

Originally Posted by antichef

wow -thanks! I'll get in touch with them.

Assuming I get some of those, any recommendation for a 14 pin DIP quad op-amp to replace those old clunkers? The 5534 is single?

Yeah, sorry. Well, there's my old standby OPAx134, 4134 in this case. But I don't really know exactly what is called for here. I'm guessing speed and distortion are more important than noise, since this is a line-level circuit, but I dunno . . . maybe something quieter? Just be sure you get something unity-gain stable.

[Somnium7]

Originally Posted by mshilarious

Yeah, sorry. Well, there's my old standby OPAx134, 4134 in this case. But I don't really know exactly what is called for here. I'm guessing speed and distortion are more important than noise, since this is a line-level circuit, but I dunno . . . maybe something quieter? Just be sure you get something unity-gain stable.

+1 on his suggestion 0.00008% distortion/noise is quite admirable. Even the lowly TL074 would be a significant improvement to the original part though.

[mshilarious]

Originally Posted by Somnium7

+1 on his suggestion 0.00008% distortion/noise is quite admirable. Even the lowly TL074 would be a significant improvement to the original part though.

I figured he might as well be spendy on the Burr Brown chip since the adaptor will probably cost more

[antichef]

I filled out the contact form at the adapter place - we'll see what they say. I put some 4134s and also some new 4136s (supposed to be a little better than the old ones - my fall back plan ) in my cart at mouser. Whenever stuff comes in, maybe I can do a before/after clip.

[Somnium7]

Originally Posted by mshilarious

I figured he might as well be spendy on the Burr Brown chip since the adaptor will probably cost more

Yeah Aries always had that off-the-hook premium pricing despite the fact they pay such grossly substandard wages to their workers and use automated assembling.
I thought the idea there was to offer more competitive pricing

[antichef]

Aries never did write me back Maybe I need to pretend to be a big shot who might buy a bunch of stuff.