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I was busy salvaging a bunch of Dental electronic equipment for interesting parts when I came across this interesting circuit board construction and I thought you might get a kick out of it.             This is a driver circuit from a handheld LED composite cure light. It allows the operator to select a timer setting and drives a high power LED that has it's light output towards the blue end of the spectrum. The unit also controls a cooling fan the size o ...
I have this beautiful Toroidal Transformer but it is 19 Volts and I need 24 Volts for my application.     It has a nice big donut hole and I have plenty of 16 GA solid enameled wire so I decided to add a few more windings. The first step was to figure how many windings I would need. I used some lighter gauge wire and wound 10 windings, hooked up the transformer and measured the voltage. I had 1.7 volts for the ten windings so 29 windings should give me the boost I need. This can't ...
There have been many times when I have wished that I had a hot air heat source that could be controlled. The rework station has a controlled heat source but it will not work below 100 C. For this project I have decided to build a modified hot air gun that will have controlled temperature output between room temperature and 350 C. This should be very useful for testing and calibrating devices using thermistors. I will begin by hacking my inexpensive heat gun from Spark Fun.   https://www.sp ...
If you don't want to be disappointed by this blog don't read any further cause I lied.   The problem is that I have just signed up for a new Garbage Service. The new bin is to be left on the curb by my house in a very specific position so that the truck can come by and use its robotic arm to pick up the bin and tip it upside down to empty it. The arm then returns the bin to the curb in exactly the same position that I left it. I do not know when the truck comes so I find my self checking t ...
A while back I explored the Ideal Bridge available using the LT 4320 Controller and 4 N Channel MOSFETs.   https://www.element14.com/community/people/jw0752/blog/2017/02/01/exploring-the-lt4320-ideal-diode-bridge-controller   I also built a two channel linear bench supply using some Chinese Kits.   https://www.element14.com/community/people/jw0752/blog/2017/02/11/oh-no-not-another-power-supply   In this blog I will explore the results when I built another module with the ...