1969 Tektronix film about printed circuits
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ruffrecords
Well-known member
Fascinating. I can still rememeber double sided PCBs being drawn in red and blue but this technique predates that.
Cheers
Ian
Cheers
Ian
Brian Roth
Well-known member
Back in the 1970's, I recall Bishop Graphics "pioneering" the two color system. However, mid 1970's, I did my first two sided board using steps similar to what is on that video.
IE, light table, a translucent grid, and perhaps three layers on top (pads, top side, bottom side). Tis been over 40 years and I don't recall the specifics except for the fact I used black 2:1 patterns and "crepe" tape for the traces.
Bri
IE, light table, a translucent grid, and perhaps three layers on top (pads, top side, bottom side). Tis been over 40 years and I don't recall the specifics except for the fact I used black 2:1 patterns and "crepe" tape for the traces.
Bri
ruffrecords
Well-known member
I think it was back in 1979 I was working on a missile control electronics. It consisted of about a dozen plug in boards wired together point to point. The trouble was, by the time the board had been wired together and the inevitable mistakes corrected, the assembly as a whole failed the strict quality control standards. I persuaded them to replace the huge wiring harness with an 8 layer PCB which was cutting edge technology at the time. If I recall correctly. one draughtsman and I worked solidly for a month or more on the hand drawn layout.. I am pleased to say it solved the QA problems and the test firings were successful.
Cheers
Ian
Cheers
Ian
In the video: It's SO Tektronixs to use gold as etch resist 
Jakob E.
Jakob E.
It is a little hard and painful to remember the old days and old ways, but here is a picture of my drafting table (an old desk) with my drawing board and T-square where I used to design metal chassis with pencil and paper....
I still have some old bishops graphics tape and footprints for laying out PCBs.
FWIW ICs used to be laid out by hand... In the early 70's the company where I worked made some semi custom ICs (Interdesign). All but the top metalization layer was standardized, and a custom top metal connected the devices differently to perform custom functions. Not as flexible as a full custom ICs but a fraction of the cost. As I recall the top rubylith looked similar to a hand taped PCB layout, but blown up many times more.
JR
I still have some old bishops graphics tape and footprints for laying out PCBs.
FWIW ICs used to be laid out by hand... In the early 70's the company where I worked made some semi custom ICs (Interdesign). All but the top metalization layer was standardized, and a custom top metal connected the devices differently to perform custom functions. Not as flexible as a full custom ICs but a fraction of the cost. As I recall the top rubylith looked similar to a hand taped PCB layout, but blown up many times more.
JR
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sahib
Well-known member
Very very enjoyable to watch.
