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Potentiometer: Mallory Volume Control on a Tung-Oil Paper Ring
A 1930s radio volume control from Mallory's patent (US 2,144,925, 1939). A carbon ring sits on a base of two resin-fibre discs. A spring arm on the shaft wipes the ring with one contact and a centre metal ring with its fingers, so turning the knob changes the resistance between the centre lug and either end lug. The patent gives no sizes; the parts are named by what they do.
The picture: the patent's drawing (Figs. 1 and 2).
Kati
2 hours
Maagizo
1
1
Clamp the two base discs on the bushing
Clamp the two base discs on the bushing
Stack two discs of resin-impregnated fibre. A metal bushing through their centres clamps them together, with a metal disc clamped against the back of the rear disc. Ours: close the bushing with a hammer and rivet set.
Vifaa kwa hatua hii:
Diski ya nyuzi iliyolowekwa resini2 vipande
Bushi ya chuma1 kipande
Diski ya chuma ya nyuma1 kipandeZana zinazohitajika:
Nyundo ya riveti
Seti ya riveti2
2
Fit the centre contact ring
Fit the centre contact ring
Lay the metal contact ring, with its own terminal lug, on the face of the front disc, centred. An eyelet (or rivet) through the lug holds it. Ours: set with a rivet set and hammer.
Vifaa kwa hatua hii:
Pete ya mguso yenye kiungio cha terminali1 kipande
Kijishimo cha riveti1 kipandeZana zinazohitajika:
Nyundo ya rivetiSeti ya riveti3
3
Bolt on the resistance ring
Bolt on the resistance ring
Lay the carbon resistance ring on the front disc, round the contact ring. Two terminal bolts pass through the ring's silver-painted ends and the disc; each holds a terminal lug under the disc. The bolts clamp the ring and connect its ends.
Vifaa kwa hatua hii:
Kipengele cha Upinzani cha Kaboni1 kipande
Boliti ya terminali2 vipande
Kiungio cha terminali2 vipandeZana zinazohitajika:
Koleo za mdomo mwembamba4
4
Fit shaft and spring contact arm
Fit shaft and spring contact arm
Put the shaft through the bushing. On its front end fix the spring contact arm over a small piece of sheet insulation: upset the shaft end to hold the insulation, and clamp arm and insulation together with a rivet pin. The arm's contactor rides on the carbon track, its fingers on the contact ring.
Vifaa kwa hatua hii:
Shafti ya kudhibiti1 kipande
Mkono wa mguso wa mfinyo1 kipande
Karatasi ya kuhami1 kipande
Pini ya riveti1 kipandeZana zinazohitajika:
Nyundo ya rivetiSeti ya riveti5
5
Clip washer and cover
Clip washer and cover
Snap a clip washer into the groove in the shaft behind the bushing. It stops the shaft sliding and keeps the arm and fingers pressed on their rings. Fix the metal cover cap over the parts by bending its ears onto the discs.
Vifaa kwa hatua hii:
Washa ya klipu1 kipande
Kifuniko cha chuma1 kipandeZana zinazohitajika:
Koleo za mdomo mwembamba
Koleo la Mdomo BapaVifaa
14- 2 vipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- Kishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 2 vipandeKishikilia Nafasi
- 2 vipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
Mchoro huu unatengeneza
Blueprint zinazohusiana
Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni
CC0 Umma Wote
Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.
Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.