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2SC1972 WIDEBANT POWER AMPLIFIER

Konusu 'Fm Verici Devreleri' forumundadır ve uydudoktoru tarafından 1 Temmuz 2015 başlatılmıştır.

  1. uydudoktoru
    Offline

    uydudoktoru Aktif Üye Yönetici Yönetici

    Katılım:
    13 Haziran 2009
    Mesajlar:
    2.142
    Ödül Puanları:
    38
    There is a very good and very cheap 88-108 Mhz 14w apmlifier. You can find all the components from farnell.co.uk.



    Parts List 14 Watt RF Amplifier
    C24, C27 – 470 pf mica capacitor
    C25 – 100 pf mica capacitor
    C26 – 39 pf mica capacitor
    C28 – 15 pf mica capacitor
    C23, C20, C31 – .001 uf disc or monolythic capacitor, marked eitther 102, .001 or 1n
    C22, C21, C32 – .1 uf disc capacitor or monolythic capacitor, marked either 104, .1 or 100n
    C29 – 10 uf electrolytic (observe correct polarity)
    L1 – 1 turns #18 tinned copper, 1/4 ” diameter
    L2 – 1 uh inductor, blue lumpy item
    L3 – 2 turns #18, 1/4″ diameter
    L4 – 7/10″ # 14, hairpin
    L5, L6 – 5 turns # 20, 1/4 diameter
    R17 – 56 ohm resistor with ferrite bead over lead at the base end of Q1
    Q1 – 2SC1971 RF transistor
    Misc – RG174 coax, hookup wire, SO239 sockets (2), 4-40 nuts and bolts (4 each) ferrite
    bead, banana sockets & plugs (red/black 2 ea.) and solder lugs

    Assemble by soldering the components to the pads indicated. Keep coil, resistor and capacitor leads as short as
    possible. The coils should be 3/16″-1/4″ above the board and separate turns by one wire diamter, bend lead to
    form a little mounting foot for soldering to the circuit boar. Tuning & power output are affected by the distance
    between the coil turns, you can make fine adjustments by either spreading or compressing the coil slightly.
    The area surrounding the pads is ground, C25, C28,C26 & C20-C32, L2 and R17 are soldered at one end to ground
    as well as the shield braid on the coax cables. Bolt Q1 to a small heat sink or the chassis with heat sink thermal
    compound or gray thermal pad underneath the tab. With an input level of 2.5w you should see an ouput
    of 14 watts. Be sure to have a proper dummy load (50 ohms) or tuned antenna connected to the output, doing
    otherwise will likely destroy the transistor.

    Solder Q1 in with lettering up.
    Use a 4-40 bolt and nut to attach
    Q1 to either a small heat sink or
    the chassis for proper heat disperal.
    Use heat sink thermal compound
    underneath the tab

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