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1) Deskripsyon
Pake sa a gen schematic a ak yon PCB-Layout pou yon osilator FM lè l sèvi avèk BF900 Doub Gate Mosfet a, epi yo ka itilize ant 90 ak 110 megaèrts. Bagay sa yo espesifik sou osilator sa a se ke li gen ki ba anpil bri, epi li trè ki estab. Si ou itilize bon tampon, yon PLL pa ta dwe nesesè ankò (byenke li se ofcourse posib sèvi ak yon sèl).
Se frekans nan premye mete nan tondeuz C4. Ajisteman ki kapab fèt ak R8 (VFO ranje se sou 4 megaèrts).
Gen kèk tès te ban m 'rezilta pwochen:
(Frekans = 100 megaèrts; Sòti = 50 om enbesil (20 * 1K / 1W par; ombryou)
Antre = Sweeposcillator 0.5-55 ke (Stereo xslt)
Pouvwa ploge: 15 V DC ('pa gen tranch rid')
Antre aktyèl: 50 MA
RF Sòti: 55 mVpp
Frekans. Devyasyon: 0.005 megaèrts (apre 10 èdtan; te devyasyon an te pran plas pandan èdtan nan premye, apre yo fin ke pa gen okenn devyasyon)
2) Eleman / sijesyon
Sèvi ak yon PCB bon jan kalite bon, lòt bò lanmè a se kwiv, fè kèk koneksyon ki genyen ant de pati yo. Bati osilator a nan yon RF-prèv aman, sèvi ak bon konektè ak kab, epi yo dwe okouran de tout lòt RF règ yo-nan bilding nan.
Nan mòn BF900 nan yon twou (dyamèt sou 6 mm) yo dwe fèt kote bwat la ka pann pous Se mwen menm te gen pwoblèm ak bagay la 'lòt bò kòb kwiv mete', paske osilator m 'lan pa ta vire sou (pa twò ase bri? jis plèzantri). Li te rezoud lè mwen retire kòb kwiv mete nan anba BF900 la (apeprè 1 - 1.5 dyamèt cm).
Si yon moun gen yon eksplikasyon pou li, kite m 'konnen ...
Pa sèvi ak lòt kalite rezistans!
Ou te kapab sèvi ak yon zene-estabilizasyon olye pou yo 7800-regilatè a. Pwoblèm nan sèlman se ke li ta kapab lakòz yon DC-tranch rid sou osilator a, epi ki pral remake kòm humm. Yon regilatè vòltaj se pa konsa pou sa chè, Se konsa, pa koupe depans sou li.
Olye pou yo BF900 a, yon BF905 oswa BF907 kapab itilize san yo pa nenpòt pwoblèm. Petèt yon BF981 ta fè tou, men ke mwen pa te teste.
3) Pwoblèm?
Si ou gen kèk pwoblèm, ou gen pou yo eseye rezoud pwoblèm sa yo tèt ou an premye. Men, si pa gen okenn solisyon ka jwenn ou kapab kontakte m ', pou nou ka eseye travay li soti. Kous Sa a se bati pa m ', li travay.
Ou kapab tou kontakte m 'si ou gen kèk schematic enteresan oswa materyèl, sèvi ak E-mail: [imèl pwoteje] (omwen jiskaske Oktòb 1994)
Ofcourse ou ka sèvi ak menm adress la pou lòt kesyon oswa kòmantè sou schematic sa a.
Eric van Gorkom
Lis eleman ki nan osilateur la FM ak BF900 la
résistances:
(Tout rezistans yo se kalite metalfilm eksepte R1 ki se yon rezisteur kabòn)
R1: 47k, 1/8 W R2: 47k, 1/8 W R3: 47k, 1/8 W R4: 100E, 1/8 W R5: 220k, 1/8 W R6: 100k, 1/8 W R7: 150E, 1/8 W R8: 10k, lin. po
kondansateur:
C1: 100 nF multi oswa seramik C2: 4.7 pF seramik C3: 100 nF seramik (1 oswa 10 nF pral fè tou) C4: 40 pf taye C5: 4.7 pF seramik C6: 10 pF seramik C7: 22 pF seramik C8: 1 nF seramik C9: 1 nF seramik C10: 100 nF seramik C11: 100 nF seramik C12: 100 nF seramik C13: 47 uF / 25V C14: 1 nF seramik
Endukteur:
L1: 4 wdg, dia 8 mm, 1 mm CuAg, espas 1 mm; Monte 8 mm pi wo pase PCB (plon yo se 4 mm) L2: 6-twou ferroxcube wideband HF-toufe (5 wdg) L3: 6-twou ferroxcube wideband HF-toufe (5 wdg)
Lòt moun:
Q1: BF900 D1: BB405, BB102 oswa egal (pifò varicaps ak C = 2-20 pF (approx) pral fè) U1: uA78L08, uA7809, uA7810 oswa egal (MC78LXX, UC78LXX elatriye)
lòt pwodwi nou an:
Antre nan imèl yo ka resevwa yon sipriz
es.fmuser.org
it.fmuser.org
fr.fmuser.org
de.fmuser.org
af.fmuser.org -> Afriken
sq.fmuser.org -> Albanyen
ar.fmuser.org -> Arab
hy.fmuser.org -> Armenian
az.fmuser.org -> Azerbaydjan
eu.fmuser.org -> Basque
be.fmuser.org -> Belarisyen
bg.fmuser.org -> Bulgarian
ca.fmuser.org -> Katalan
zh-CN.fmuser.org -> Chinwa (senplifye)
zh-TW.fmuser.org -> Chinwa (Tradisyonèl)
hr.fmuser.org -> Kwoasyen
cs.fmuser.org -> Czech
da.fmuser.org -> Danwa
nl.fmuser.org -> Olandè
et.fmuser.org -> Estonyen
tl.fmuser.org -> Filipino
fi.fmuser.org -> Finnish
fr.fmuser.org -> Franse
gl.fmuser.org -> Galisyen
ka.fmuser.org -> Georgian
de.fmuser.org -> Alman
el.fmuser.org -> Greek
ht.fmuser.org -> Kreyòl ayisyen
iw.fmuser.org -> ebre
hi.fmuser.org -> Hindi
hu.fmuser.org -> Hungarian
is.fmuser.org -> Icelandic
id.fmuser.org -> Endonezyen
ga.fmuser.org -> Ilandè
it.fmuser.org -> Italyen
ja.fmuser.org -> Japonè
ko.fmuser.org -> Koreyen
lv.fmuser.org -> Latvian
lt.fmuser.org -> Lithuanian
mk.fmuser.org -> Masedwan
ms.fmuser.org -> Malay
mt.fmuser.org -> Maltese
no.fmuser.org -> Norwegian
fa.fmuser.org -> Pèsik
pl.fmuser.org -> Polonè
pt.fmuser.org -> Pòtigè
ro.fmuser.org -> Romanian
ru.fmuser.org -> Ris
sr.fmuser.org -> Sèb
sk.fmuser.org -> Slovak
sl.fmuser.org -> Slovenian
es.fmuser.org -> Panyòl
sw.fmuser.org -> Swahili
sv.fmuser.org -> Syèd
th.fmuser.org -> Thai
tr.fmuser.org -> Tik
uk.fmuser.org -> Ikrenyen
ur.fmuser.org -> Oudou
vi.fmuser.org -> Vietnamese
cy.fmuser.org -> Welsh
yi.fmuser.org -> Yiddish
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