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John Wiltrout's Blog Anyone seen circuit modules like this before?
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  • Author Author: jw0752
  • Date Created: 3 Apr 2020 7:40 PM Date Created
  • Views 2012 views
  • Likes 12 likes
  • Comments 14 comments
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Anyone seen circuit modules like this before?

jw0752
jw0752
3 Apr 2020

I am busy salvaging circuit boards while my mind resets and a new idea for a build takes form. Yesterday I disassembled a circuit board from a Planmeca X-Ray machine (a company from Finland) that dated from the 1990s. Among the salvaged components were a few that looked like this:

 

   imageimage

 

I have seen something similar in other equipment that was packaged in brown ceramic but this is the first time I have come across this style. I believe I even knew the name of this type of circuit that was popular about 30 to 40 years ago but the name eludes me at this time.

 

I am curious if any one knows more about them. Were they general electronic parts or were they manufactured for specific applications and OEM only? So far I have not been able to get the internet to cough up anything about them.

 

Thanks

 

John

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Top Comments

  • jw0752
    jw0752 over 5 years ago in reply to michaelkellett +5
    Hi Michael and Fred, With nothing better to do with them I copied the Wikipedia article and used an old picture frame to make a wall display. John
  • michaelkellett
    michaelkellett over 5 years ago +4
    They look like what we used to call "thick film hybrids". These were ceramic substrates with track and resistors printed on and fired. Then some normal parts were surface mounted on top. They were a good…
  • Jan Cumps
    Jan Cumps over 5 years ago +4
    Blue silicone potting compound. Some references: https://www.eletimes.com/conformal-coatings-vs-potting-compounds-better-protect-pcb-coating-resin https://wendy-rl.en.made-in-china.com/product/HvUmYnOJYcWs…
  • jc2048
    jc2048 over 5 years ago in reply to jw0752

    Black can also look quite smart. This is an SSR on a pcb from about 25 years ago. [I'm not sure what the board was for. Might have been a temperature sensor running some mains fans, or something like that.]

     

    imageimage

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  • jw0752
    jw0752 over 5 years ago in reply to fco2martinez

    Thanks for your information. I do remember seeing similar circuits in the TVs from the 80s

     

    John

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  • fco2martinez
    fco2martinez over 5 years ago

    Those designs were done in the 80s for analog circuits were passive circuits were required such as resonant circuits or coupling filters, quick examples were: Chroma Delay line for Color Television and Dolby B or C for Compact Tape systems.

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  • frostybeard
    frostybeard over 5 years ago

    I am going to venture a guess that it is a photomultiplier tube or Geiger counter voltage source. These output around 700 V, so that explains why it would be potted.

     

    It could also potentially be an avalanche photodiode bias source, which outputs around 70 V.

     

    There used to be a company in Salo, Finland with that logo that is on the module: Aspocomp

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  • harrimansat
    harrimansat over 5 years ago in reply to harrimansat

    https://www.google.es/url?sa=i&url=https%3A%2F%2Fwww.embedded.com%2Fthe-humble-yet-mighty-resistor%2F&psig=AOvVaw1FJiUdE…

     

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