Hacker Friendly

I’ve just finished watching all of Walter Lewin’s exceptional MIT course 8.02: Electricity and Magnetism. In lecture #31, he gives an hour long lecture about rainbows. I highly recommend watching it, even if you don’t have time to work through the rest of the course. You’ll learn all sorts of fascinating things about the phenomenon […]

 

Check out this retro home-brew 7cm oscilloscope. It was beautifully designed and executed, down to the mahogany housing and exposed CRT.
I like this engineer’s attitude:
The choice of tubes is somewhat arbitrary. The EF91 would be very suitable in all three functions, since among small-signal pentodes, it is unusual in having suitable characteristics for providing a […]