Dual single SOIC to dual DIP8 adapter

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carlmart

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Joined 2001
preciseaudio.com
#1
I'm having some problems precisely identifying, for ordering, SOIC to DIP8 adapters.

Perhaps someone can teach me how to order things correctly, and how to look for them.

My may problem is how to find a dual SOIC to DIP8 adapter. The times I have tried I got a two-single SOIC to DIP8 adapter, one SOIC on the top, one SOIC on the bottom. Which is not what I wanted.

I want to adapt a SOIC chip with a dual-opamp inside (like the OPA1656) to a DIP8 adapter. I suppose it's clear what I want, but I get tricked every time with the wrong adapter. I need to get it right!
 
#3
Have a look at this Forum thread: Blind test: opamp rolling in the Pearl 3 phonostage . It talks about using SOIC-8 opamp chips, mounted on adapter boards, to plug into DIP-8 sockets on a PCB which expects thru hole opamp chips. In this particular test, the SOIC-8 chips were "anonymized" so the listeners did not know the manufacturer or the part number. But that's usually unnecessary, most applications of opamp chips don't involve blind listening tests.

The photos attached to post #1 of that thread might be helpful in some way.
 
#5
davidsrsb said:
The DIP8 is emulating a dual or typical single device?
Click to expand...
By emulating you mean connecting, right? The DIPs do a continuous connection, not an emulation.

But using two adapters in series add capacitance, induction and resistance. The capacitance is the major factor, and can only be corrected, after doing the tests and picking the best opamps, by soldering each pin to every socket.

But the best thing to do, if you made your own PCBs, is to provide the SOIC pads and the signal paths on the pcb itself.
This might get complicated if you pick single chips in your rolling.
 
#7
There are countless SOIC8 to DIP8 adapters out there. These are what I found on Ali in just a few minutes...

https://www.aliexpress.us/item/2251801665905615.html
https://www.aliexpress.us/item/2251832572961805.html
https://www.aliexpress.us/item/2251832542146100.html
https://www.aliexpress.us/item/2251832634923098.html
https://www.aliexpress.us/item/3256807122524982.html
https://www.aliexpress.us/item/3256807141859633.html
https://www.aliexpress.us/item/2251832451654873.html

I know you want to use a dual op-amp, but do not search for "dual" adapters or you will find ones meant for 2x single SOIC op-amps.
 
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#11
Mark Johnson said:
Have a look at this Forum thread: Blind test: opamp rolling in the Pearl 3 phonostage . It talks about using SOIC-8 opamp chips, mounted on adapter boards, to plug into DIP-8 sockets on a PCB which expects thru hole opamp chips. In this particular test, the SOIC-8 chips were "anonymized" so the listeners did not know the manufacturer or the part number. But that's usually unnecessary, most applications of opamp chips don't involve blind listening tests.

The photos attached to post #1 of that thread might be helpful in some way.
Click to expand...
Hi Mark,

Thank you for telling me about that thread.

But I couldn't find any specific mention or discussion about using SOIC-8 opamp chips, mounted on adapter boards, to plug into DIP-8 sockets on a PCB which expects thru hole opamp chips.

Of course I would like to read about concerns on using SOIC do DIP adapters, although I'm aware about socketing/plug-in adapters, particularly about capacitive and metal to metal contacts.
 
#12
The photos attached to post #1 of the thread about opamp rolling in Pearl3, are copied below.


one-jpg.1282644


two-jpg.1282645


three-jpg.1282646
 
#14
There were no problems, therefore no discussion of problems. The listeners plugged those adapters into the DIP-8 sockets on the PCB of their Pearl3 phonostage, and played music. With no problems.

A few, but not all, of the opamps tested, were available in DIP-8 packages. Fortunately, ALL of the opamps tested were available in SOIC-8 packages. Thus, for maximum anonymity, ALL opamps were purchased in SOIC-8 packages and then soldered onto adapters. Even the most ancient opamps of the batch, so old that their datasheet was released in 1971 (link) , were purchased in SOIC-8. Ordering code suffix is "D" for the SOIC-8 package on this device.
 
#16
Here is Wayne Colburn's schematic of the Pearl 3 (left channel), taken from post #1 of the Pearl3 thread. U2 is not an opamp, it is a TI DRV135 fully balanced XLR line driver. PCB photo attached below.

pearl3_ba2023-jpg.1220540
 

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#17
carlmart said:
Thanks for the list. Some do not show clearly the interconnections between SMD and DIP pins. This ones does:

https://www.aliexpress.us/item/1005007245948148.html?spm=a2g0o.detail.pcDetailTopMoreOtherSeller.4.1629P07YP07YuQ&gps-id=pcDetailTopMoreOtherSeller&scm=1007.40050.354490.0&scm_id=1007.40050.354490.0&scm-url=1007.40050.354490.0&pvid=52c822a2-d267-474b-ba19-806698b00370&_t=gps-id😛cDetailTopMoreOtherSeller,scm-url:1007.40050.354490.0,pvid:52c822a2-d267-474b-ba19-806698b00370,tpp_buckets:668#2846#8109#1935&pdp_ext_f={"order":"120","eval":"1","sceneId":"30050"}&pdp_npi=4@dis!USD!0.62!0.59!!!4.46!4.24!@2103209b17419533142145531ee36f!12000039933553335!rec!BR!166951577!X&utparam-url=scene😛cDetailTopMoreOtherSeller|query_from:

Pity it doesn't come in kits with gold-plated pins.
Click to expand...
Standard IC sockets aren't gold plated so you definitely don't want gold plated pins - never mix tin and gold if you want reliable connections.
 
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