Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
A long time ago, power supplies used to be built into electronics products, yes they were big and heavy, but since then we have now moved on and most appliances (except for really high end audio and noise sensitive things that you would not find in your average appliance anyway) now use much...
When I started reading this I thought it was a challenge..until I got to the "I need help" bit.
I am in agreement with the other members, no one here is going to do your homework for you, especially not me since its been 20 years since I have had to do any calculations regarding filters...
Well I was going to post a picture of the ones we used to use but image search seems to be broken at the moment, but the gears were enclosed and the turns counter was more like a car odometer.
I used to hand wind bobbins for a living lol They were on ferrite C cores though, there were the occational ones which just had a ferrite rod going through them too.
(I say hand wind, we used a mandrel which had a gear ratio of about 1:3, but with a 2500 turn coil, that is still a lot of...
One thing that has been bugging me is why a motor under load would draw more current. I get WHY it has to draw more current to do more work, but I cant get the mechanism of how. I tried to think of the motor like a transformer with the rotor being the secondary, but then my idea falls apart...
I have to be honest I have never given the operation of transformers that much thought, electromagnetic induction was as far as my thinking went..however I did do some research to find out why transformers operating at higher frequencies can be made so much smaller.
This thread reminds me of...
Except that would require a macro lens as well, or an extension tube at least, which I don't have and cant afford at the moment. I have been using an 18-200mm lens and I can get to about 50cm of the subject whilst still having a "useful" depth of field.
A couple of examples of my lockdown work...
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