General > General Technical Chat
What was your first circuit? Do you still remember it?
themadhippy:
--- Quote ---It actually looks simpler on a physical switch because you're just connecting the 4 corner terminals out of the 6 in an X.
--- End quote ---
6 terminals? were did you find these strange intermediate switches as every one ive used only has 4 terminals to keep it simples for us thick sparkys
brucehoult:
--- Quote from: themadhippy on November 26, 2022, 12:55:25 pm ---
--- Quote ---It actually looks simpler on a physical switch because you're just connecting the 4 corner terminals out of the 6 in an X.
--- End quote ---
6 terminals? were did you find these strange intermediate switches as every one ive used only has 4 terminals to keep it simples for us thick sparkys
--- End quote ---
How on earth can you have a DPDT switch with only 4 terminals?
Unsurprisingly, 11 year old me in 1974 isn't the only one to come up with this.
https://forum.digikey.com/t/how-to-wire-a-dpdt-switch-as-4-way-for-multiway-switching/6985
themadhippy:
--- Quote ---How on earth can you have a DPDT switch with only 4 terminals?
--- End quote ---
Take a look at your diagram,theirs only 4 external connections needed ,and thats what you buy off the shelf from your electrical supplier,they go under the name of intermediate switch and do exactly what you described above,sit between 2 way switches to add a 3rd,4th -999th switching position.They really should rename them universal switch as they can be used for the most common switching arrangements found on lighting circuits.
Calambres:
I remember my first circuit very well: a crystal (diode) radio. Then it came the Philips Electronic Engineer. I was fascinated:
I still keep the original manual:
CatalinaWOW:
Similar path to many, first built was a 'crystal' radio based on a germanium diode, then on to a regenerative receiver based as I recall on a 12AT6 tube. The first one I designed myself was a dual slope A-D converter. That had maybe 5% accuracy, drift so bad that only the lack of accuracy saved it, 8 bit resolution and several samples per second conversion rate. But I was still proud of it. Boy did I have a lot to learn.
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