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DCD Acoustic Coupler AC.350.OM

iz8dwf

Veteran Member
Joined
Mar 20, 2017
Messages
812
Location
Italy
Hi all,
I've started restoring this '70s acoustic coupler. It was quite extensively damaged internally during transport, since the heavier boards broke the backplane's connectors and traveled floating inside the wooden case.
I would like to find any information about this modem, a few searches on google only are able to find images of this device, but no manuals, schematics or any other information.
It's mainly made with discrete transistors (MicroElectronics MAxxxx, MExxxx, one that I remember is MA8001, no datasheet found about these also). It has however two ICs, one 741 opamp, with a 1974 date code
and an XR210 with 1981 date code (socketed). Now the XR210 could have been replaced sometimes in 1981, since it seems largely unlikely that such an acoustic coupler would still be made in the '80s (I have 1980's acoustic couplers too and they are the "classic" small plastic ones).
So, does anyone have old datasheets related to these components? I would be interested in knowing when the XR210 was introduced for example, and when the ME,MA transistors were "popular" (at least in the UK).
Any other info is obviously appreciated.
Thanks

Frank IZ8DWF
 
For some bizarre reason, I clicked on your link and got Dave's EEVBlog on soldering SMT. I just clicked again and everything's okay. :)

As Emily Latella said "Never mind".
 
For some bizarre reason, I clicked on your link and got Dave's EEVBlog on soldering SMT. I just clicked again and everything's okay. :)

As Emily Latella said "Never mind".

That's what Rosanne Rosannadanna also said. :razz:
 
Both Gilda Radner characters, but I don't recall R.R. saying that; her tagline was ""Well, Jane, it just goes to show you, it's always something--if it ain't one thing, it's another."
 
Both Gilda Radner characters, but I don't recall R.R. saying that; her tagline was ""Well, Jane, it just goes to show you, it's always something--if it ain't one thing, it's another."

You are so right. So, never mind.
 
Hi all,
I've started restoring this '70s acoustic coupler. It was quite extensively damaged internally during transport, since the heavier boards broke the backplane's connectors and traveled floating inside the wooden case.
I would like to find any information about this modem, a few searches on google only are able to find images of this device, but no manuals, schematics or any other information.
It's mainly made with discrete transistors (MicroElectronics MAxxxx, MExxxx, one that I remember is MA8001, no datasheet found about these also). It has however two ICs, one 741 opamp, with a 1974 date code
and an XR210 with 1981 date code (socketed). Now the XR210 could have been replaced sometimes in 1981, since it seems largely unlikely that such an acoustic coupler would still be made in the '80s (I have 1980's acoustic couplers too and they are the "classic" small plastic ones).
So, does anyone have old datasheets related to these components? I would be interested in knowing when the XR210 was introduced for example, and when the ME,MA transistors were "popular" (at least in the UK).
Any other info is obviously appreciated.
Thanks

Frank IZ8DWF
Good day.
I am also unable to find any documentation regarding this modem. Can you please tell me what Power Supply you used for your modem as mine did not come with one?
 
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