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SM6LKM's OPTIMIST 80 - Component List (DOS text version / HTML) CAPACITORS: Position Value C1 47 pF NP0 ceramic C2 15 pF NP0 ceramic C3 2700 pF ceramic C4 100 nF MLC C5 10 nF MLC C6 4.7 uF 16V tantalum egg C7 4.7 uF 16V tantalum egg C8 10 nF MLC C9 10 nF MLC C10 100 nF MLC C11 330 pF NP0 ceramic or polystyrene, (temp. stable) C12 470 pF NP0 ceramic or polystyrene, (temp. stable) C13 330 pF NP0 ceramic or polystyrene, (temp. stable) C14 470 pF NP0 ceramic or polystyrene, (temp. stable) C15 470 pF NP0 ceramic or polystyrene, (temp. stable) C16 - C17 100 nF MLC C18 10 pF NP0 ceramic C19 47 pF NP0 ceramic C20 120 pF NP0 ceramic C21 47 nF Wima MKS 02 C22 47 nF Wima MKS 02 C23 47 nF Wima MKS 02 C24 47 nF Wima MKS 02 C25 4.7 nF Wima MKS 02 C26 4.7 nF Wima MKS 02 C27 47 uF 10V electrolytic C28 220 uF 25V electrolytic C29 100 nF MLC C30 10 uF 10V electrolytic C31 220 uF 10V electrolytic C32 47 nF MLC C33 22 uF 25V electrolytic C34 33 uF 10V electrolytic C35 100 uF 25V electrolytic C36 100 nF MLC C37 220 uF 25V electrolytic C38 100 nF MLC C39 100 nF MLC C40 2.2 uF 25V electrolytic C41 47 uF 25V electrolytic C42 2.2 uF 25V electrolytic C43 100 nF MLC C44 100 nF MLC C45 100 nF MLC C46 100 nF MLC C47 100 nF MLC C48 100 nF MLC C49 100 nF MLC C50 100 nF MLC C51 100 nF MLC C52 100 nF MLC C53 100 nF MLC, 5 mm C54 10 nF MLC C55 100 nF MLC C56 470 pF ceramic, 5 mm (C56+C57 = 940 pF for 3.7 MHz) C57 470 pF ceramic, 5 mm C58 820 pF ceramic, 5 mm (C58+C59 = 1721 pF for 3.7 MHz) C59 820 pF ceramic, 5 mm C60 390 pF ceramic, 5 mm (C60+C61 = 879 pF for 3.7 MHz) C61 470 pF ceramic, 5 mm C62 2.2 uF 25V elecrolytic C63 10 nF MLC C64 2.2 uF 25V elecrolytic C65 2.2 uF 25V elecrolytic C66 1 nF ceramic C67 2.2 uF 25V elecrolytic C68 100 nF MLC CV1 Variable capacitor, about 35 pF, from old FM tuner. (mounted on the front panel) Comments: The electrolytic capacitors are the smallest possible vertical models. All other capacitors have 2.5 mm pin spacing unless otherwise noted. MLC = MultiLayer Ceramic. DIODES: Position Value D1 1N4148 D2 BB809 D3 BB809 D4 1N4148 D5 Red high intensity LED (mounted on the front panel) D6 1N4148 D7 1N4148 D8 1N5403 (not on the PCB) FUSE: Position Value F1 1 Amp (not on the PCB) INTEGRATED CIRCUITS: Position Value IC1 NE612 IC2 LM386N-1 IC3 TL071 or other low noise OP-amp IC4 741 or other OP-amp capable of driving a LED IC5 LM317L or TL317L IC6 LM317L or TL317L RELAY: Position Value K1 NAIS/SDS typ TQ2-12 COILS & CHOKES: Position Value L1 64 turns 0.3mm wire on T50-2 (Micrometals/Amidon) L2 37 turns 0.4mm wire on T50-2 (Micrometals/Amidon) L3 21 turns 0.6mm wire on T50-2 (Micrometals/Amidon) L4 21 turns 0.6mm wire on T50-2 (Micrometals/Amidon) RFC1 15 uH low resistance RFC, 5 mm, (Neosid Sd75 is fine) RFC2 15 uH low resistance RFC, 5 mm, (Neosid Sd75 is fine) RFC3 15 uH low resistance RFC, 5 mm, (Neosid Sd75 is fine) RFC4 100 uH RFC, 5 mm, (Neosid Sd75 is fine) T1 Primary: 2 x 23 turns 0.4mm wire on T50-2 (Micrometals/Amidon). Wind as a 46 turn winding that is cut in the middle. Secondary: 6 turns evenly spread out over the primary winding. T2 12 bifilar turns 0.3mm twisted wire on RCC6/4/2-4A11 (Pink 6mm ferrite toroid from Philips). Twist the wires about four turns per centimeter. TRANSISTORS: Position Value Q1 BF245A (*MUST* be the A variety (low supply voltage)) Q2 BC337-25 Q3 BD137 or BD139 Q4 BD131 (Note! BD135/BD137/BD139 does NOT work here) RESISTORS: Position Value R1 68k R2 1k R3 1k R4 1k R5 220k R6 220k R7 1k R8 220k R9 220k R10 47k R11 47k R12 1k R13 1k R14 5k6 R15 4k3 R16 10k R17 100k R18 1k2 R19 4k3 R20 100 R21 10k R22 10k R23 10 R24 6k8 R25 1k2 R26 4k3 R27 220k R28 220k R29 270 R30 100k See text! R31 1k5 R32 1k5 R33 91 R34 68 R35 91 R36 1k R37 510 R38 680 R39 4.7 R40 100 R41 10 R42 470 R43 510 R44 330 R45 4.7 R46 39 R47 4.7 R48 510 R49 100 R50 10 R51 10 R52 1 Comments: All resistors are metal film, 0.6W, 1% tolerance POTENTIOMETERS: Position Value RT1 500k Beckman Industrial (BI) type 82 RT2 10k Beckman Industrial (BI) type 64W (15-turns) RT3 10k Beckman Industrial (BI) type 64W (15-turns) RV1 1k logarithmic panel potentiometer (mounted on the front panel) RV2 20k linear 10-turn panel potentiometer for example Beckman type 7286 (expensive, check your junk box before ordering!) (mounted on the front panel) MISCELLANEOUS: - Heat sink for the final transistor Q4. Austerlitz model K25-003 is recommended. An insulating washer must be used. - PCB SM6LKM Optimist 80 Rev.A. - Power switch. - Low-Z dynamic microphone, preferably with PTT button. - Microphone connector. - Loudspeaker. - BNC antenna connector. - A nice box. - Plus all the details I have forgotten... End of file.