IṢẸ́ ỌNÀ
ẸWÀ ÀTI ÌLERA
IṢẸ́ ỌWỌ́
ÀṢÀ ÀTI ÌTÀN
ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
SÁYẸ́ǸSÌ
ERÉ ÌDÁRAYÁ
ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
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).
Àárín
2 hours
Ìlànà
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Àwo okun tí a rì sínú resini2 ẹyọ
Búṣìn irin1 ẹyọ
Àwo irin ẹ̀yìn1 ẹyọÀwọn irinṣẹ́ tí a nílò:
Òòlù ìso
Àkójọ ìso2
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Òrùka ìkàn pẹ̀lú etí ìsopọ̀1 ẹyọ
Ihò rívẹ́ẹ̀tì1 ẹyọÀwọn irinṣẹ́ tí a nílò:
Òòlù ìsoÀkójọ ìso3
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ẹya Atako Erogba1 ẹyọ
Bọ́ọ̀tì ìsopọ̀2 ẹyọ
Etí ìsopọ̀2 ẹyọÀwọn irinṣẹ́ tí a nílò:
Ẹ̀mú imú gígùn4
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ọ̀pá ìdarí1 ẹyọ
Apá ìkàn onírọ̀rùn1 ẹyọ
Bébà ìdáàbòbo iná1 ẹyọ
Pín rívẹ́ẹ̀tì1 ẹyọÀwọn irinṣẹ́ tí a nílò:
Òòlù ìsoÀkójọ ìso5
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Wásà agékù1 ẹyọ
Fìlà ìbòrí irin1 ẹyọÀwọn irinṣẹ́ tí a nílò:
Ẹ̀mú imú gígùn
Ẹmú Ẹnu PẹrẹsẹÀwọn ohun-èlò
14- Àyè
- 1 ẹyọÀyè
- 1 ẹyọÀyè
- Àyè
- 1 ẹyọÀyè
- 1 ẹyọÀyè
- 2 ẹyọÀyè
- 2 ẹyọÀyè
- 1 ẹyọÀyè
- 1 ẹyọÀyè
- 1 ẹyọÀyè
- 1 ẹyọÀyè
- 1 ẹyọÀyè
- 1 ẹyọÀyè
Ìtọ́nisọ́nà yìí ń ṣe
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