ESSENTIAL INFORMATION BUILD INSTRUCTIONS CHECKING YOUR PCB & FAULT-FINDING MECHANICAL DETAILS HOW THE KIT WORKS CREATE YOUR OWN SPEAKER DOCK WITH THIS STEREO AMPLIFIER KIT Version 2.
Stereo Amplifier Essentials www.kitronik.co.uk/2136 Build Instructions Before you start, take a look at the Printed Circuit Board (PCB). The components go in the side with the writing on and the solder goes on the side with the tracks and silver pads. 1 PLACE RESISTORS Start with the six resistors: The text on the PCB shows where R1, R2 etc go. Ensure that you put the resistors in the right place. PCB Ref R1 & R2 R3 & R4 R5 & R6 2 Value 10K 4.
Stereo Amplifier Essentials www.kitronik.co.uk/2136 6 ATTACH THE BATTERY CLIP The PP3 battery clip should be attached to the terminals labelled ‘POWER’. Connect the red wire to ‘+’ and the black wire to ‘-’ after feeding it through the strain relief hole. 7 CONNECT THE AUDIO CABLE The stereo Jack lead should be connected to the ‘INPUT’ terminal. First, feed the wires through the strain relief hole. The black wire should be connected to the terminal labelled ‘BLK’.
Stereo Amplifier Essentials www.kitronik.co.uk/2136 Adding an On / Off Switch If you wish to add a power switch, don’t solder both ends of the battery clip directly into the board, instead: 1 Solder one end of the battery clip to the PCB, either black to ‘-‘ or red to ‘+’. 2 Solder the other end of the battery clip to the on / off switch. 3 Using a piece of wire, solder the remaining terminal on the on / off switch to the remaining power connection on the PCB.
Stereo Amplifier Essentials www.kitronik.co.
Stereo Amplifier Essentials www.kitronik.co.uk/2136 Designing the Enclosure When you design the enclosure, you will need to consider: The size of the PCB (below left, height including components = 15mm). How big the batteries are. How to mount the two speakers (below right). How to allow the audio cable out of the box.
Stereo Amplifier Essentials www.kitronik.co.uk/2136 How the Amplifier Works Input R5 100K C4 470 F TDA2822 In 1 + Speaker 1 Out 1 In 1 - R6 100K Battery (15V max) In 2 + In 2 - C3 10 F Out 2 C5 470 F C6 100nF R1 10K C1 C2 R2 100 F 100 F 10K R3 4R7 Speaker 2 C7 100nF R4 4R7 At the centre of the circuit is an audio amplifier Integrated Circuit or IC.
Online Information Two sets of information can be downloaded from the product page where the kit can also be reordered from. The ‘Essential Information’ contains all of the information that you need to get started with the kit and the ‘Teaching Resources’ contains more information on soldering, components used in the kit, educational schemes of work and so on and also includes the essentials. Download from: www.kitronik.co.
