UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
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).
Hagati
2 hours
Amabwiriza
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.
Ibikoresho by'iyi ntambwe:
Isahani y'imitwe yinjijwemo ibisigarira2 ibice
Busheni y'icyuma1 igice
Isahani y'icyuma y'inyuma1 igiceIbikoresho bikenewe:
Inyundo yo gushyira riveti
Agatsiko ka 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.
Ibikoresho by'iyi ntambwe:
Impeta y'ubwuzuzanye n'agahuza1 igice
Agaterura gafunze1 igiceIbikoresho bikenewe:
Inyundo yo gushyira rivetiAgatsiko ka 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.
Ibikoresho by'iyi ntambwe:
Igice cy'ubuhangarwe bwa karubone1 igice
Igikoresho cy'uduhuza2 ibice
Agahuza2 ibiceIbikoresho bikenewe:
Utubariro tw'umunwa muremure4
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.
Ibikoresho by'iyi ntambwe:
Umutambiko w'ubugenzuzi1 igice
Ukuboko k'ubwuzuzanye gufite ubworoherane1 igice
Urupapuro rurinda amashanyarazi1 igice
Agapfundo k'uguhuza1 igiceIbikoresho bikenewe:
Inyundo yo gushyira rivetiAgatsiko ka 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.
Ibikoresho by'iyi ntambwe:
Rondereri y'agakaratasi gafata1 igice
Umupfundikizo w'icyuma1 igiceIbikoresho bikenewe:
Utubariro tw'umunwa muremure
Ipfundo Rifite Umunwa UringaniyeIbikoresho
14- Umwanya
- 1 igiceUmwanya
- 1 igiceUmwanya
- Umwanya
- 1 igiceUmwanya
- Umwanya
- 2 ibiceUmwanya
- 2 ibiceUmwanya
- 1 igiceUmwanya
- Umwanya
- Umwanya
- 1 igiceUmwanya
- Umwanya
- 1 igiceUmwanya
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