Crystal Radio--Air Variable Capacitors (4K)
Рет қаралды 885
4 ай бұрынWe'll review the parts and "how to's" of variable capacitors and go over some unusual ones.
@marvinwiseman3449 4 ай бұрын
4 bank capacitor for an AM / FM radio. The fewer plate sections are for the FM.
@adnacraigo6590 4 ай бұрын
Small mechanical marvels when you think about it.
@tsbrownie 4 ай бұрын
It's only recently that I've begun to appreciate that. I've always taken them for granted.
@MrKarlGP 4 ай бұрын
I think the slower tuning one might have a planetary gear within the white plastic section... much sought after especially for the fine tuning requirements of the very narrow amateur shortwave bands :)
@tsbrownie 4 ай бұрын
In these, I 3d printed the knobs. They're just plain plastic no mechanism.
@MrKarlGP 4 ай бұрын
@@tsbrownieDIY knobs, excellent! :) I have repurposed screw caps from bottles as knobs before, using a little Milliput (epoxy modelling clay) inside the cap to accommodate the spindle and a little drill hole in the side for a securing screw :) Perhaps bearings around the rota are responsible for the slow tuning in the tuning capacitor you featured? Vernier tuning dials tend to be horribly expensive.
@tsbrownie 4 ай бұрын
@MrKarlGP My son's 3d printer has made things I only dreamed of before, possible. In the past I'd drill 2 holes in a piece of plastic and carve out the space in between. It was slow and inaccurate. I have no guess how that 2 speed dial works, and don't know what it is called, so I can't look it up.
@franzliszt3195 4 ай бұрын
I'm going to try milliput. There is no way I can do 3d printing!@@MrKarlGP
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