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Four components of the FM transmitter (C9018)
Circuit shown in Figure, BG and L and the transistor junction capacitance high-frequency oscillator circuit composed of transistor junction capacitance of about 2 ~ 3P, make the FM frequency falls within the scope of the coil should be 5mm in diameter around the core 7 of a circle, then by the condenser microphone modulated with a frequency of vibration when the signal generator frequency offset, to achieve FM. The emission current distance and the size of the emission control work, the resistance can not come too big nor too small, between 300 and 500 in Europe, less than 1 mW power.
BG when selected, the pipe must be greater than fT 300MHz, such as high frequency with 2SC3358 tube, the frequency is more stable, longer distance will be more. Inductance L divided into two coils around the system, but to be the same around, L1 0.5mm enameled wire with a diameter of 5mm in diameter and 4 turns around the skeleton, L2 3 turns around. Antenna can be 10cm long soft wire, use hand to touch the antenna will affect the frequency of changes. When used at a fixed location is very stable.
This circuit can be put into such a small ink bottle, the kit can be installed in the pen, battery or more small batteries A13, but note that a small-capacity battery plus a switch.
9018
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es.fmuser.org
it.fmuser.org
fr.fmuser.org
de.fmuser.org
af.fmuser.org ->Afrikaans
sq.fmuser.org ->Albanian
ar.fmuser.org ->Arabic
hy.fmuser.org ->Armenian
az.fmuser.org ->Azerbaijani
eu.fmuser.org ->Basque
be.fmuser.org ->Belarusian
bg.fmuser.org ->Bulgarian
ca.fmuser.org ->Catalan
zh-CN.fmuser.org ->Chinese (Simplified)
zh-TW.fmuser.org ->Chinese (Traditional)
hr.fmuser.org ->Croatian
cs.fmuser.org ->Czech
da.fmuser.org ->Danish
nl.fmuser.org ->Dutch
et.fmuser.org ->Estonian
tl.fmuser.org ->Filipino
fi.fmuser.org ->Finnish
fr.fmuser.org ->French
gl.fmuser.org ->Galician
ka.fmuser.org ->Georgian
de.fmuser.org ->German
el.fmuser.org ->Greek
ht.fmuser.org ->Haitian Creole
iw.fmuser.org ->Hebrew
hi.fmuser.org ->Hindi
hu.fmuser.org ->Hungarian
is.fmuser.org ->Icelandic
id.fmuser.org ->Indonesian
ga.fmuser.org ->Irish
it.fmuser.org ->Italian
ja.fmuser.org ->Japanese
ko.fmuser.org ->Korean
lv.fmuser.org ->Latvian
lt.fmuser.org ->Lithuanian
mk.fmuser.org ->Macedonian
ms.fmuser.org ->Malay
mt.fmuser.org ->Maltese
no.fmuser.org ->Norwegian
fa.fmuser.org ->Persian
pl.fmuser.org ->Polish
pt.fmuser.org ->Portuguese
ro.fmuser.org ->Romanian
ru.fmuser.org ->Russian
sr.fmuser.org ->Serbian
sk.fmuser.org ->Slovak
sl.fmuser.org ->Slovenian
es.fmuser.org ->Spanish
sw.fmuser.org ->Swahili
sv.fmuser.org ->Swedish
th.fmuser.org ->Thai
tr.fmuser.org ->Turkish
uk.fmuser.org ->Ukrainian
ur.fmuser.org ->Urdu
vi.fmuser.org ->Vietnamese
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yi.fmuser.org ->Yiddish
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