Pocket Transistor Radio Kit 13-0450 - Profe Saul

In order to give the IC the voltage it requires we use a special component called a Zener Diode. The Zener Diode isnormally used as a voltage reference device, as it has quite a stable voltage drop across it. We make use of thisvoltage drop, by connecting the Zener in series with the battery. The voltage drop across the Zener is subtracted fromthe battery voltage leaving us with approximately 2V: just what we want!In order to smooth out any voltage fluctuations, which may occur as the load changes, an electrolyic capacitor isconnected across the normal 2V supply.Definition of resistor colour code100Ω 1KΩ 100KΩBrown Black Brown Brown Black Red Brown Black YellowComponent ViewCoil InformationEarphone socketPCB Mark Coil Lead Colour Coil Lead Colour(3 Wire Coil) (4 Wire Coil)Tuning CapacitorBattery snapB Pink BlackP Red GreenR Not fitted to coil RedG Black or green PinkNote: You may receive either a 3 wire coil or a 4 wire coil(see table above for wiring information)and some of the core coloursmay appear to be faint or dull.Circuit DiagramOptional 'Long wire' AntennaPRGBIC1C1R1R2C2VR1TR1CEBL1- +C3-K-R3AZD1+C4AntennaPinkVR1 5KTrimmerAKEarphoneZD16.8VL1RedBlackGreen2VC160-160pFC1.01uFR2100KZN414*IC131C20.1uFR11KBR3100ΩECTR1DS548+-C3100uF16V+-C4100uF16V-+9V* Please note that the ICmarked on the diagram asZN414, will be an equivalentof the ZN414 (ie MK484 etc.)Assembly TipsWhen soldering components to the PCB, try not to use too much solder as this may cause rounded solder joints.The coil connections must be made via the tip of each lead (the part that is soldered) as the remainder of the lead iscoated with enamel (which will not conduct electricity!).