1,5 Watts FM broadcast transmitter (87,5-108 MHz), 50kHz stepsize, dual-speed. (Hartley oscillator version) Resistors (¼ watts carbon or metal film) (values are in Ohms, unless otherwise noted) R1 = 470 R2 = 12k R3 = 680 R4 = 1k R5 = 22k R6 = 22k R7 = 22k R8 = 56 R9 = 220 R10 = 3k3 R11 = 1k R12 = 220 R13 = 47 R14 = 220 R15 = 470 R16 = 150 R17 = 150 R18 = 68 or replace by a VK200 wideband choke R19 = 270 R20 = 47 (for a 2N4427) else a VK200 wideband choke R21 = 100 R22 = 10k R23 = 10k R24 = 390 R25 = 390 R26 = 22k R27 = 10k R28 = 10k R29 = 10k R30 = 10 R31 = 10 P1 = 500, adjustable, Piher 10 mm Ø, horizontal mount P2 = 1k, adjustable, Piher 10 mm Ø, horizontal mount Capacitors C1 = 100µF/25v C2 = 47µF/25v C3 = 100pF (np0) C4 = 10nF C5 = 1nF C6 = 10nF C7 = 1nF C8 = 470µF/25v C9 = 1nF C10 = 1nF C11 = 1nF C12 = 10uF/25v C13 = 60pF trimmer, Philips (yellow color) or similar C14 = 60pF trimmer, Philips (yellow color) or similar C15 = 1nF C16 = 60pF trimmer, Philips (yellow color) or similar C17 = 60pF trimmer, Philips (yellow color) or similar C18 = 56pF C19 = 56pF C20 = 56pF C21 = 27pF C22 = 10nF C23 = 10pF(*) optional C24 = 100nF/63v (MKT) C25 = 22uF/25v C26 = 100nF C27 = 22pF trimmer, green C28 = not used C29 = 100nF C30 = 1nF C31 = 100nF C32 = 100nF C33 = 10nF C34 = 22pF (np0) C35 = 22pF (np0) C36 = 1nF C37 = 10µF/25v C38 = 1nF C39 = 10µF/25v C40 = 10µF/25v C41 = 100nF C42 = 100nF C43 = not fitted (was 39pF) Cx = 3n9 (50µS) or 4n7 (75µS) pre-emphasis (this capacitor can be omitted when using an MPX-signal to drive the unit.) Note: mount a 10pF (1206 SMD-chip capacitor) between the base and collector of T7 Semiconductors D1 = BB809, Philips, Yellow band D2 = 1N4148 D3 = LED, Green, 3 mm D4 = LED, Red, 3 mm T1 = BF981 T2 = BFR91 T3 = BFR96(S) T4 = 2N4427 or 2N3553 (either with heatsink) T5 = BC557B T6 = BD139 IC1 = 78L05 IC2 = 78L09 IC3 = 78L05 U1 = TSA5511 (Philips) U2 = PIC 16F84(A) or PIC 16F628(A) LD1 = 1x16 character LCD display with backlight, HD44780 compatible (optional) Coils L1 = 4.5 turn, 6 mm diameter, 1 mm CuAg, tap 3/4 to 1 turn from ground (spaced) L2 = 3 turn, 5 mm diameter, 1 mm CuL (closewound) L3 = 5 turn, 5 mm diameter, 1 mm CuL (closewound) L4 = 3.5 turn, 6 mm diameter, 1 mm CuL (closewound) L5 = 3.5 turn, 6 mm diameter, 1 mm CuL (closewound) L6 = 3.5 turn, 6 mm diameter, 1 mm CuL (closewound) L7 = 3.5 turn, 6 mm diameter, 1 mm CuL (closewound) L8 = 10µH, moulded choke L9 = 10µH, moulded choke L10 = 10µH, moulded choke L11 = VK200 choke Misc. X1 = 3.2 MHz crystal, 30-32pF, parallel res. X2 = 4 MHz crystal J1 = 14 pin boxed header, pcb mount, (90°angle) S1 = push button ("ON" when pressed) S2 = push button ("ON" when pressed) S3 = push button ("ON" when pressed) JP1 = 2 pins header + jumper Notes (*) not used CuAg = silver plated copper wire CuL = magnetwire, enameled copper wire (Note: 1 mm CuL approx. equals to AWG18 0,3 mm approx. equals to AWG28) (I) all diameters are measured from the inside of the coils, i.e. 'internal' diameters D3 indicates if the PLL is locked D4 indicates if the PLL is not locked (C)2006-2007 Lorian, The Netherlands. THIS DESIGN IS *NOT* TO BE USED FOR COMMERCIAL PURPOSES! (Sunday, January 14, 2007 (rev.3))