Total posts : 45366
The circuit exhibitions are enjoyed by this visitor.
The vector board with flea clips is what I used for Big Talker shortwave project.
I originally happened upon the vector board approach in the 1970s when building some mic preamps for a homemade audio mixing board used in my recording business.
My self-made circuits held up better than a lot of commercially made equipment. A Ramko Audio Board had circuit cards that everyday had to be jiggled or they’d lose contact. Cleaning didn’t help.
An ITC Reel-to-reel recorder was made with internal flat-ribbon connector cables that didn’t stand up to the current in some lines and many of the capacitors went bad in short time.
Here’s a question…. what kind of liquid hardener can be used to create sealed pot type encapsulated circuits that are made secret for all time? I tried it with some liquid glues but the impedances went crazy as the compounds must have contained conductive moisture.
Oh, and why is the crystal in the glass tube? Is it a virtual “oven”?