Kitronik FM Radio KIT Essential Information Download Page 1 | Manualshive

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FM RADIO KIT

GET IN TUNE WITH THIS

ESSENTIAL INFORMATION

BUILD INSTRUCTIONS

CHECKING YOUR PCB & FAULT-FINDING

MECHANICAL DETAILS

HOW THE KIT WORKS

Version 2.0

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Summary of Contents for FM Radio KIT

Page 1: ...FM RADIO KIT GET IN TUNE WITH THIS ESSENTIAL INFORMATION BUILD INSTRUCTIONS CHECKING YOUR PCB FAULT FINDING MECHANICAL DETAILS HOW THE KIT WORKS Version 2 0 ...

Page 2: ... Brown black gold The ceramic disc capacitors should be soldered into the board There are a lot of these so be careful to put them all in the correct place The capacitors can be identified by the text printed on them see close up image below right It doesn t matter which way around the capacitor goes into the board Solder the voltage regulator shown right into the PCB where it is labelled IC2 Make...

Page 3: ...er has a different value so they have to be put in the correct place If you look at the potentiometers you will see they are labelled with their value The shaft of the potentiometer should point away from the PCB PCB Ref Value R1 10K R5 100K Solder the PP3 battery clip to the terminals labelled Power In Connect the red wire to and the black wire to after feeding it through the strain relief hole S...

Page 4: ...onnect any batteries for you radio Check the bottom of the board to ensure that All holes except the four large mounting holes are filled with the lead of a component All these leads are soldered Pins next to each other are not soldered together Check the top of the board to ensure that The outline of components IC2 and IC3 match the outlines on the PCB The negative markings on the electrolytic ca...

Page 5: ...oth ends of the battery clip directly into the board instead Solder one end of the battery clip to the PCB either black to or red to Solder the other end of the battery clip to the on off switch Using a piece of wire solder the remaining terminal on the on off switch to the remaining power connection on the PCB 1 2 3 ...

Page 6: ...required length and are designed to be mounted using a 7mm diameter hole Maximum panel thickness is 4 5mm allows 2mm for nut and washer on potentiometers The potentiometers can be mounted off board and connected to the PCB using lengths of wire if required Mounting the PCB to the enclosure The drawing to the left shows how a hex spacer can be used with two bolts to fix the PCB to the enclosure You...

Page 7: ...inductor L1 capacitor C16 and the varicap diode D1 A varicap diode is a diode that also has a capacitance This capacitance varies as the voltage across the diode varies By adjusting the potentiometer R5 which is used to tune the circuit the voltage that is fed to the varicap diode can be adjusted This in turn changes the capacitance of the varicap diode and therefore the frequency of the resonant ...

Page 8: ...the output accordingly With an infinite gain the amplifier is no good to amplify audio which is where the feedback comes in By making one of the input a percentage of the output the gain can be fixed which allows the output to be a copy of the input but bigger Now when the two inputs are compared and the output is adjusted instead of it going up or down until it reaches 0 volts or V it stops at th...

Page 9: ...t educational schemes of work and so on and also includes the essentials Download from www kitronik co uk 2135 Every effort has been made to ensure that these notes are correct however Kitronik accept no responsibility for issues arising from errors omissions in the notes Kitronik Ltd Any unauthorised copying duplication of this booklet or part thereof for purposes except for use with Kitronik pro...

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