........................................................................................................
TRANSMISOR FM(PLL)
Capacitores
C1,C2 - 47pf or 20pf ceramic disc (match to 4.00Mhz crystal load imp)
C7,C8,C15,C23,C24, - 0.01uf ceramic disc
C10,C12-C14,C16,C22,C26-C29,C31 - 0.001uf ceramic disc Y5P temp coeff
(note, on the FM100, C16 = 0.1uf ceramic disc for better bass. Must change R10 also.)
C18,C20 - 8.2pf ceramic disc (10pf will work fine too! get COG temp coef version)
C33 - 220pf ceramic disc
C9 - 0.1uf ceramic disc
C3,C4,C6,C17,C19,C21,C25,C34 - 10uf 35V electrolytic (anything above 16V is ok)
C5, C11 - 1000uf 35V electrolytic cap (C11 may be 470uf)
Cristales
Y1 - 4.000Mhz PARALLEL CUT CRYSTAL (Important! Use a parallel NOT series crystal)
Y2 - 38Khz cystal (available from Digi_key)
Inductores
(only one since there is no low pass filter!!)
L1 - 0.085 - 0.100uH adjustable shielded can tunable coil (Mouser part
number 434-1012-3.5CS)
Resistencias
all are 1/4W 5% carbon film types
R1,R2,R4,R8,R18,R20,R23-26 - 10K
R2 - 470 ohm
R3 - 1Meg (10Meg can be used too)
R5,R13,R14,R17 - 270 ohm
R7 - 100K
R9,R15 - 68K for US (or 150K), don't know yet for Europe/Asia. Used for Pre-emphasis.
R19 - 2.2K (this resistor sets the non-boosted mode power.)
R10 - 1K (470 ohms is used on the FM100, but must change C16 also)
R12 - 100 ohms
R21 - 4.7K
R22 - 150K
R11,R16 - 1K horizontal mount resistor trimmers
R6 - 100K horizontal mount resistor trimmer
IC
U1 - MC145170P or MC145170P1 PLL chip (available from author or Motorola dist.)
U2 - MC68HC705K1 custom programmed micro-controller (e-mail author for workaround)
U3 - BA1404 Stereo FM transmitter chip (get from DC Electronics)
Semiconductores
Q1 - 2N3904 NPN general purpose switching transistor (dirt cheap)
Q2,Q3 - 2SC2498 NPN UHF transistors (available from author or MCM electronics)
D1 - Red LED
D2-D5 - 1N4002 diodes (any 1 amp, 50V or better diode will work)
D6-D20 - 1N4148 or 1N914 switching diodes (dirt cheap)
D21 - MV2105 Varactor diode (available from DC Electronics)
VR1 - 78L05 +5V 100mA voltage regulator
Otros
J1 - DC power jack (DC Electronics, Jameco Electronics)
S1 - DPDT Pushbutton switch (I've seen this blister packed at a local electronics shop)
S2 - Pushbutton switch (available from author, Digi-key, B.G. Micro)
S3 - 3 quantity of a 4 position dip switch. Some FM25 shipped with side actuating 'piano' type levers.
Any 4 position dip switch will work though.
J2-J4 - PC mount RCA jacks (Jameco, Digi-Key, DC Electronics
Un circuito muy interesante, pero tambien muy dificil de fabricar, por lo que requiere de IC que no se consiguen con facilidad, la fabricacion de este circuito me va ha tomar algun tiempo.
