Transformerless supplies are sometimes used in things that have no external "user" connections, like plug-in remote controlled power sockets.its to run a small air pump but a regular 12v supply is to little
that i understand easily. my issue is obtaining a suitable transformer. realistically any transformer i use is simply adding extra components that can fail. I FULLY EXPECT THIS TO EVENTUALLY FAIL. it will be in a fairly harsh environment. hence a transformerless supply. since any component that fails can easily be replaced. no so much a transformer for on the spot repairs.
Thanks for the input guys. I have several okd cores i can rewind for an isolation/reducing transformer. They are just simply quite heavy. 15lbs at least. I had only hoped a transformerless would have been much lighter but after 10+hours of tinkering, yall are correct. Its useless. As for the drain, im not sure. Its not so much a pump as a fan. For blowing up air mattresses and pools. Its the perfect size for my needs and i have plenty of dc motors to replace the once inside should it inevitably burn out. So i propose this question: should i go with a full wave bridge rectifier or is there another preferred way to do it?
a regular 12v supply is to little and its intended 12v car battery is to strong
Using a capacitor in place of a resistor, you would need a 270uF 250V AC rated one.
Something like this:
Are you sure about that? I've always been told a start capacitor was an electrolytic and should never be used on AC, other than the very short time to start the motor by phase shifting the start winding.
https://en.wikipedia.org/wiki/Motor_capacitor A run cap may work though.
My apologies for the confusing questions. Been a bit busy with to much and was responding in a rush. I did try using caps with resistors to build a capacitive potential divider? It worked just fine to dim a bulb or run an ac motor slowly but did nothing when i attemped to rectify to dc. Multimeter showed dc output but didnt run even a small dc motor. Dangers aside i dont plan to try doing it this way so ill rewind a transform. But curious me wants to know if a core can be built or is it best to just rewrap an existing core?
But I refer you to post #12, you need to find out what power you require for it first before you either rewind, or buy one.
higher voltage and a modest 1 to 2 amps seems great.
Nothing is written on the casing of the fan or serial information other than the sn of the model but has no results online other than typical use and price. Granted its designed to run directly off of a 12v x*-amp car battery but theres no solid information on the motor other than dont run longer than 10 minutes. Ive used a: 12v 1.5 and 2 amp adapter and it runs meh. Sure itll blow air but nothing usable. Ive also used a 19.5v 1amp adapter and ran slightly better. Along with a 6v 1amp and it was the same as the 12s. A car battery will run it to the point of a leaf blower but as i stated thats just to strong. I can likely be wrong but it seems a higher voltage and a modest 1 to 2 amps seems great. Just the need for the greater voltage has put me outside of what im able to buy at the moment.
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