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That epoxy-like plastic the components, posts and wires on the boards in https://static.righto.com/images/sband-twt/transformers.jpg https://static.righto.com/i
by tpmx 5y ago
That epoxy-like plastic the components, posts and wires on the boards in https://static.righto.com/images/sband-twt/transformers.jpg https://static.righto.com/images/sband-twt/transformers.jpg are covered in - looks like it might be a way to perform vibration-proofing? Seems like it would be very robust.
Know anything more about this method?
- kens 5y agoThe Juno II rocket launch in 1959 spectacularly failed when the rocket did a U-turn after launch. The cause was two diodes touching due to vibration. After that, rocket components were often potted in plastic to prevent similar problems. Video of launch: https://www.youtube.com/watch?v=885as-VE50g&t=1446s https://www.youtube.com/watch?v=885as-VE50g&t=1446s Discussion of diodes: https://youtu.be/885as-VE50g?t=1688 https://youtu.be/885as-VE50g?t=1688
- tpmx 5y ago62 years ago. Just letting that sink in. (Thanks for the video links!)
- ngcc_hk 5y agoHow does one knew at that time that is the issue … must be a great detective work!
- jacquesm 5y agoSame for plenty of vehicles, early ECUs were often potted and the ones you see today sometimes still have a resin coating on the component side to harden the device against vibration.
- gumby 5y agoMy dad said he referred to those potted assemblies as “integrated circuits” when working on TV bandwidth compression for the phone company in early 1960s australia.