Hands Free Mobile Instructions.pdf - Emdrc.com

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Component Layout All parts mount on the double sided PCB using “through hole” components for easy assembly* IMPORTANT: This resistor (R4) is marked on the silkscreen overlay of some Printed Circuit Boards as a 33k resistor. This is incorrect - it should be a 3k3 resistor, as shown here. *SKILL LEVEL: Constructors are advised that this is relatively densely populated board, so the skill required to solder this project should be considered “Intermediate Level”.
Parts List The following parts are supplied as part of the FULL EMDRC KIT: RESISTORS (all metal film, 2% or 5%) 5 x 10k ¼ Watt (R1, R2, R14, R15, R16) 4 x 3k3 ¼ Watt (R3, R4, R8, R11) 1 x 4k7 ¼ Watt (R9) 1 x 2k2 ¼ Watt (R7) 1 x 6k8 ¼ Watt (R10) 1 x 100R ¼ Watt (R12) 1 x 470R ¼ Watt (R13) TRIMPOTS (all vertical multi-turn sealed) 50k TRIMPOT 25-turn (GAIN) 10K TRIMPOT 25-turn (LO) 100K TRIMPOT 25-turn (HI) CAPACITORS 1 x 1.0uF 50volt Multilayer Ceramic (C1) 4 x 0.022uF 100volt Polyester Film (C2, C3, C4, C5) 3 x 22uF 10volt Tantalum (C6, C7, C8) 2 x 0.1uF 25volt Multilayer Ceramic (C9, C10) 2 x 470pF 50volt Multilayer Ceramic (C11, C12) SEMICONDUCTORS and ICs 1 x TL072 Dual OpAmp 8pin PDIP (IC1) 1 x PIC18F1220-I/P pre-programmed MCU 18pin PDIP (IC2) 1 x 1N5819 Schottky Diode (D1) 1 x 1N4148 Diode (D2) 1 x LM78L05 5volt Regulator (IC5) 1 x BC548 NPN Transistor (Q2) 1 x 5mm BLUE LED with mounting clip (“ON AIR”) OTHER 3 x IC Sockets (one each of 8pin, 16pin, 18pin) 2 x RJ45 PCB Sockets side entry (8/8pin) 2 x 2-pin polarised headers (PTT and EXT POWER) 2 x 2-Pin polarised plugs and pins 1 x ‘SERPAC’ plastic case, model 131-BLACK 1 x Electret Microphone and cable with 3.5mm stereo plug 1 x Pushbutton Switch, momentary contact (PTT) 1 x 3.5mm Stereo PCB socket (MIC INPUT) 1 x 16pin IDC DIP plug (JUMPER) 1 x 6-hole ferrite bead RF Choke (RFC) 1 x PCB coded "EMDRC HANDS FREE“ YOU WILL NEED TO PROVIDE: Solder, short lengths of hookup wire, a suitable cable from the Hands-Free Adapter to your radio, and optionally any additional cabling if you’d like your radio’s existing microphone to be connected to the ‘loop-through’ microphone socket.
Page 1 and 2: An EMDRC construction project by Ra
Page 3 and 4: From humble beginnings... This is a
Page 5 and 6: Features (continued) • Flashing L
Page 7 and 8: Power connection • Many modern ra
Page 9: Quality PCB provided in the kit Dou
Page 13 and 14: Construction (continued) Alignment
Page 15: FAQ Q. Are there any circumstances

Hands Free Mobile Instructions.pdf - Emdrc.com

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