A while ago, I bought an HP 1652b logic analyzer. It’s a great machine, and works very well for my purposes (monitoring address and data bus for SNES memory usage) and I’m sure it will be invaluable in future projects, especially anything including parallel or serial data transfer. However, the only way to get data off of the analyzer is printing to a dot matrix printer/plotter through an antiquated RS232 or GPIB port. Those aren’t really common or useful anymore, but hopefully that does mean we can capture the data as a digital image for keeping around on our PC. This is a short documentation of my research and application process on creating an adpater to capture the signal on my PC.
Continue reading “hp 1652b rs232 USB adapter”Month: August 2019
numechron clock restoration, flywheel replacement
I got this clock from a flea market, Rodgers, in Rodger, OH. I think I paid $7 for it in a broken condition.
When plugged in, it still hummed, giving me hope that it was still repairable. After opening, it looks like this magnetic flywheel has become deformed, or some other problem, and it doesn’t spin freely. Some googling shows these are actually pretty neat motors- they are single phase, synchronous motors. So, the AC waveform from the wall into an electromagnet creates the dipole necessary for driving the flywheel forward, no transformer or phase regulator needed. This is nice and convenient, since mains is 60Hz, the rest of the motor is just a 60:1 and then another 60:1 gear reduction, so that the motor is making 1 rotation per minute, advancing the dials.
If we can replace the flywheel, and the motor has enough power to give it the correct RPM for the main spindle to reach 1 RPM, it’ll be good as new!
Continue reading “numechron clock restoration, flywheel replacement”hello!
Welcome to matei repair blog! I like to fix things, start projects, learn about computers/ the world, and talk about all of these things. This is a side extension of my portfolio, mateijordache.info, that is also relevant to my business venture, matei repair lab.
I initially tried to write articles on projects I was working on, and then to link those short articles with the listings that I had on my portfolio website. As I get to adding more projects, I notice that there are some problems with this model. Mostly, it is adding fluff to the otherwise streamlined portfolio that I have set up on that domain, and additionally, it is not easy to know where to find those projects, and as I add more, it will become more difficult. Since I enjoy writing about those things, I figured that a blog would be the best format for capturing some scrap ideas, project development, and discussion on repair philosophy that otherwise doesn’t really belong on my main website. I do hope that this garners more interest and is a more engaging and interactive way for me to discuss projects and ideas with people. I am still learning WordPress, so there will probably be some issues or broken-ness at first, but it should be ironed out fairly quickly.