August 27, 2013
My friends at Evil Mad Scientist have a new kit for sale. It’s a 555 timer circuit that you can build yourself using discrete transistors. You can wire it into all sorts of 555 timer circuits and then probe individual nodes to see how the chip actually works.The circuit board that you get with the kit has silkscreen labels that mark the functional blocks of the circuit, and silkscreened component designators that match up with the “official” Signetics schematic.
The circuit is full of interesting analog electronic design elements. You’ll be able to play with differential pairs, current mirrors, Darlington stages, diode-connected transistors, and more.
It’s a great kit if you want to learn more about how integrated circuits work, or if you’re a fan of the indefatigable 555 timer and want to have a neat conversation piece, or even if you’re just a beginning electronics hobbyist and you want to practice your electronics assembly and soldering skills.
November 19, 2012
It’s been quite some time since I last posted about this. The project has been on the back burner for some time now since I’ve just been so busy with other things. It’s actually pretty far along the process but the cost of the parts is just too high, and the kit has quite a few parts.
I’ve been revisiting the design again to see if I can make it easier to build and less costly.
A question: Would you consider a version without a DAC? Instead of having an 8-bit digital interface (Arduino compatible), it would have analog X and Y inputs and a video/blanking input.
November 19, 2012
September 16, 2012
Several months ago at the electronics flea market I picked up a neat bit of brass. I did some internet research and it’s actually part of a 19th century scientific demonstration instrument, most likely a prism. I found a very similar example at Fleaglass. Theirs sold for quite a bit of money, but I got mine for $5, which is probably about the value of the brass in it.
So I turned it into a table lamp.
In the photo I’ve installed one of the many vintage-style reproduction light bulbs that are starting to appear. They don’t really look like a nice carbon filament bulb but I can use this every day and not worry about it burning out.
Now all I need to complete it is to put a shade on it. Ideas?