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Holiday Special 19

5 Posts authored by: garengllc
I thought that since I had information spread out all over the site, I would try to merge all the details all in one place (here).  I'll try to fill in any blanks as I put it together if I find something I missed.  Some of this will be word-for-word, but I thought it would be useful to have one single location to follow the design from start to finish.   I like to make homemade Christmas props for my front yard (you can see some here as well as here).  In addition to what is ...
I put these videos in a comment reply to one of my previous posts, but I'll give them their full due in case it was easy to miss.   Well, I hoped to do a better video, but it is out in the yard and I don't want to tear it apart while it is working well .  One comment I would like to make is that in the video I said that I was generating 5V for the LM3914, I am actually running that off of 15V as well.  So both converters put out 15V, it is just that one has better current output. ...
OK, here is an updated schematic; it is actually the exact same as before minus a pull-up resistor on the FETs.  So how about I explain things a little more and maybe we can see what I messed up this time .   So the FETs are P-Channel setup up as a low-side load.  I like to use low-side because then I don't have power always on at the other end of the Drain.  In this application, there is no power in the system at all unless it is being cranked, but it is just a habit, so I ...
garengllc

Christmas Spirit Crank

Posted by garengllc Dec 28, 2019
OK, as promised, here is a simple schematic (pretty stripped down as I didn't have time to dust off Orcad).  I tried to lay it out so that it can be followed left to right, top to bottom.  I think I captured most of the big points, but please point out something if you think I missed it (or have a question).   SCHEMATIC IS JUNK FOR BEING A COTTON HEADED NINNY MUGGINS! WILL ADD A LINK TO AN UPDATED ONE WHEN I POST. LEAVING THIS UP AS A LEARNING EXERCISE, DO NOT USE!   Here is ...
garengllc

Christmas Spirit Meter

Posted by garengllc Dec 14, 2019
I like to make homemade Christmas props for the front yard.  I have a handful of props I put out by the sidewalk to make things interactive and this year I thought that I would try something new, The Christmas Spirit-tron (the spelling on the last word is up for debate and I would love to get some thoughts).  Basically you spin a crank to light some bulbs.  The faster you spin, the more lights you light up.  I was basically shooting for something like the strong-man sledge ha ...