ESSENTIAL INFORMATION BUILD INSTRUCTIONS CHECKING YOUR PCB & FAULT-FINDING MECHANICAL DETAILS HOW THE KIT WORKS CREATE YOUR OWN SPEAKER DOCK WITH THIS MONO AMPLIFIER WITH POWER SWITCH KIT Version 1.
Mono Amplifier Essentials www.kitronik.co.uk/2173 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 three resistors: The text on the PCB shows where R1, R2 & R3 go. Ensure that you put the resistors in the right place.
Mono Amplifier Essentials www.kitronik.co.uk/2173 6 CONNECT THE WIRES The 3 connections to your amplifier PCB need to go through the strain relief holes as shown in the picture. Start with the connection labelled ‘Speaker’. The kit is supplied with ½ a metre of twin cable with a 3.5mm Jack connector on one end. This cable will be used to connect both the speaker and the MP3 player.
Mono Amplifier Essentials www.kitronik.co.
Mono Amplifier Essentials www.kitronik.co.uk/2173 Designing the Enclosure When you design the enclosure, you will need to consider: The size of the PCB (below left, height including components = 15mm) The size of the batteries. How to mount the speaker (below right). How to allow the audio cable out of the box. How to allow access to the power switch. How to make the power LED visible.
Mono Amplifier Essentials www.kitronik.co.uk/2173 How the Amplifier Works At the centre of the circuit is an audio amplifier Integrated Circuit or IC. Inside the IC are lots of transistors, which are connected together to allow the small input signal to be amplified into a more powerful output that can drive a speaker. All amplifiers need to use feedback to ensure the amount of gain stays the same. This allows the output to be an exact copy of the input just bigger.
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.
