The central of archetypal radios holds wonders that the antiseptic chips and SMD apparatus of today’s circuits can’t authority a candle to. Chunky resistors and capacitors, exhaustion tubes with cathodes aglow, and acutely free-form loops of wire basic inductors will all acceptable accomplish an appearance. But the best alluring bit of any old radio was affiliated to the affability knob: the big capricious capacitor with its interdigitating metal plates. Watching one at work, with its plates analogously and cautiously spaced, is still a joy to behold.
In an attack to anamnesis a little of that magic, [Jeremy S. Cook] came up with this home-brew capricious affability capacitor. The anatomy is congenital mainly from 3D-printed parts, which supports a shaft fabricated from a accepted t. Plates are ancient from stainless animate fender washers cut in half; the anchored plates are press-fit into the anatomy while the rotary plates ride on the shaft. The agreement amid the rotary plates is maintained by printed spacers, which additionally serve to lock the rotor into one solid unit. [Jeremy]’s prototype, for which he provides STL files, can be acquainted amid about 7 and 15 pF. Check out the body in the video below.
We adulation the attending of this, and we can brainstorm custom affability caps would appear in accessible for assertive awakening radio builds. The affability ambit is a little narrow, but that could be anchored with added plates or afterpiece spacing. That ability be a alpine adjustment with blubbery animate washers, but we’ve apparent absolutely attenuate aluminum machined and carefully spaced before, so this ability be one access to college capacitance.
Thanks to [Baldpower] for the tip.
13 Prototype Wire Forming Rituals You Should Know In 13 | Prototype Wire Forming – prototype wire forming
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