Monthly Archives: June 2010

SMTP email Submission

Posted on 30 June 2010 by tekkistuff

The basic SMTP submission dialogue goes like this. Red is the client that is sending the mail and blue is the server that is receiving it. 220 smtp.example.com ESMTP Postfix HELO relay.example.org 250 Hello relay.example.org, I am glad to meet … Continue reading →

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Aspect Ratios for Digital TV

Posted on 29 June 2010 by tekkistuff

Aspect Ratio can be confusing. It applies in different ways at different stages of the process of getting pictures on the screen. The DAR or Display Aspect ratio is what you can measure with a ruler when a picture is … Continue reading →

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Metal Bending Brake – Geometry

Posted on 11 June 2010 by tekkistuff

I’ve been experimenting with various tools for bending sheet metal. The best thing seems to be a dedicated bending brake. The workpiece (labelled A-B) is clamped between two blocks, C and D. The moving leaf E swings up through 90 … Continue reading →

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