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It has been a while since I did the last Shop Tip Blog. These are blogs about some of the simple things I have discovered that make working in my shop a little easier. Today I realized that I had not mentioned how useful a Lint Roller can be.   When I have finished a build or a salvage operation on a piece of electronic equipment there is always a mess of debris, metal chips, wire snips, and solder splatter left over. To me, it is very important that none of this debris gets to the floor. ...
I had a very challenging time last night. I have been working on producing a decent prototype of a machine I described in a previous blog.   https://www.element14.com/community/people/jw0752/blog/2017/04/17/prototyping-an-emdr-machine   The construction had been proceeding very well until last night as I neared completion and initial testing.     To power the LED Scanner I had decided to use the 2N7000 400mA  logic level MOSFETs. These, eleven in all,  had all ...
Despite 60 years of playing with electronics this is the first time I have seen a DC motor wired in this fashion.  At first I did not expect it to work on DC current but to my surprise it took off and ran perfectly. Furthermore it did not matter if the polarity was forward or reversed. The motor continued to spin happily along. Just for the fun I also applied an AC current and once again the motor continued to whirl away. Here are some pictures of the motor wiring:       ...