This is just a basic understanding of the different configurations you may come across inside electronics.
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https://www.youtube.com/watch?v=eOuSVp4hzKA
I made a nice few changes to the schematic posted in this video. The circuit would not work for me no matter what i tried. So i revamped the circuit and experimented with the oscillator circuit till i finally got a heart beat. This beast may not look good, hell it may not even work right, but it does sing in it's current form. I ripped out the varactor diode tuning and decided on using a variable capacitor with a bunch on different coils till i found something that worked. As it sits right now, it covers down as far as 350khz up to around 930khz. Would like to made it to the shortwave band, but that is another story.
Circuit can be found here: https://hackaday.com/2015/08/16/design-diary-varactor-tuned-regen-receiver/
And also here: http://theradioboard.com/rb/viewtopic.php?f=4&t=6418
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https://www.youtube.com/watch?v=ILkE1a1wIKI