<p> Assessment Task 1 LM386 Amplifier</p><p>The circuit shown above is an amplifier that can be used to replay sounds from various sources such as IPods and MP3 players. The circuit can also be used to mix sounds from various sources and this could provide a good extension task for those students that complete the assessment task early. The circuit will be powered via a 9 volts battery but once again could be modified to run off the mains.</p><p>Instructions</p><p> Use data sheets for the LM386 operational amplifier  Design the circuit using DIYLC software, this circuit is to be manufactured on strip-board  Add a switch and an LED power indicator (not shown in schematic)  Check your design against the schematic and secure approval to proceed with the manufacturing phase from the lecturer  Manufacture the completed design, drill the circuit board and gather the required components  Populate and solder components to the circuit board using safe soldering techniques  Once complete visually check the circuit board for defects, crossed tracks and dry joints  Use test equipment as directed to confirm the correct function of your circuit and components Component List:</p><p> 9 Volt Battery and Battery Holder  LM386 Amplifier  1 x 50 nf and 1 x 100 nF ceramic Capacitors  1 x 100 uF, 1 x 10 uF and 1 x 220 uF Electrolytic Capacitors  1 x 10k Potentiometers  1 x LED (power indicator)  1 x 470 Ω (for power indicator LED) , 1 x 10 Ω resistors  1 x Switch  1 x 0.3 Watt Speaker  Various Cables and Connectors</p><p>Task 1</p><p>Draw or print and attach the pin-out diagram for LM386 Operational Amplifier</p><p>LM386 Op Amp</p><p>Signed Lecturer ……………………………………………. </p><p>Date …………………………………………… Task 2</p><p>Include a circuit plan of either</p><p>Signed Lecturer …………………………………………….</p><p>Date …………………………………………</p><p>Task 3</p><p>Tick off each of the components used in this circuit against the items on the following list. I have completed one for you</p><p>Item Used in Item Used in circuit 1 circuit 1 Fixed Resistors Analogue/Digital IC’s</p><p>Variable Resistors Surface Mount Packages Potentiometers 10k Rectifiers</p><p>Sensing Resistors Switches (LDR etc) Fixed Capacitors Mini Transformers</p><p>Electrolytic Decoders Capacitors Diodes Regulators</p><p>Zener Diodes Encoders or Resolvers</p><p>Light Emitting Inverters or Servo Diodes (LED) Controllers Transistors Edge Connectors</p><p>Thyristors Wiring/pins/tags/wire links Fixing Spacers Small Heat Sinks</p><p>Insulators Cables</p><p>Cable Connectors Opto-Electronic Components Protection Devices</p><p>Signed Lecturer ……………………………………………. </p><p>Date …………………………………………… Task 4 Assemble the circuit and tick off the tools used to make this circuit from the following list</p><p>Item Item Heat shunts/tweezers Component forming devices Snipe nosed pliers Wire Strippers</p><p>Sleeving pliers Side or end cutters</p><p>Bolt fasteners Specialized assembly (spanners) equip Anti-static mats or straps</p><p>Briefly describe the procedure and tools you used to make this circuit using the box below</p><p>Signed Lecturer ……………………………………………. </p><p>Date …………………………………………… Task 5</p><p>From the following list tick off which functions you think this circuit fulfils. Once again I have given you an example, the 555 timer functions as an oscillator.</p><p>Circuit Component Circuit Component function Function Audio amplifier LM386 Filter</p><p>Signal converter Microprocessor application Signal generator Comparator</p><p>Counter/Timer Power amplifier</p><p>Oscillator Motor control</p><p>Regulated power Sensor/actuator supply circuit Logic function ADC/DAC hybrid controls circuit Display Circuit Alarm/protection circuit</p><p>Use a schematic of the circuit to highlight (circle) which components function as the circuits you have ticked off on the list above. Staple the completed schematic to this page.</p><p>Signed Lecturer ……………………………………………. </p><p>Date …………………………………………… Task 6 Test Equipment Result The resistance between power Multimeter and ground</p><p>The earth continuity Multimeter</p><p>The continuity of the power line Multimeter</p><p>The voltage levels at the power Multimeter pins for both the LM358 and the LM386</p><p>The signal at the input and output Oscilloscope of the circuit Multimeter Bench Power Supply Function Generator</p><p>Signed Lecturer ……………………………………………. </p><p>Date ……………………………………………</p><p>Task 7</p><p>Use the box below to briefly evaluate this exercise, stating the things you have learned whilst building the circuit, how you overcame any problems you encountered and what if anything you would do differently next time.</p><p>Evaluation</p><p>Signed Lecturer ……………………………………………. </p><p>Date ……………………………………………</p><p>Practical Observation Task Competent The student carried out the following tasks: Yes No Designed the circuit using DIYLC</p><p>Correctly identified the correct components to manufacture the circuit using the schematic and data sheets/charts Was able to follow the circuit plan and successfully populate the board</p><p>Correctly identified polarity dependant components </p><p>Safely soldered the components to the stripboard and carried out a visual check of the soldering Carried out a visual check on all components for signs of damage, carried out a ‘pull test’ on components to check for faulty soldering Adhered to safety regulations at all times when manufacturing the amplifier circuit, including the use of correct PPE Connect test equipment to the circuit in a safe and approved manner</p><p>Demonstrated the use of test equipment to test circuit function and trace circuit faults in a safe manner Left the workspace in a safe and tidy condition when work was completed</p><p>Assessor Feedback</p><p>Signed Lecturer ……………………………………………. </p><p>Date …………………………………………… Student Declaration</p><p>All of the work included as a part of this assessment is my own:</p><p>Task 1: Signed Student………………………………………. </p><p>Date……………………………………………</p><p>Task 2: Signed Student………………………………………. </p><p>Date……………………………………………</p><p>Task 3: Signed Student………………………………………. </p><p>Date……………………………………………</p><p>Task 4: Signed Student………………………………………. </p><p>Date……………………………………………</p><p>Task 5: Signed Student………………………………………. </p><p>Date……………………………………………</p><p>Task 6: Signed Student………………………………………. </p><p>Date……………………………………………</p><p>Task 7: Signed Student………………………………………. </p><p>Date……………………………………………</p><p>All tasks complete</p><p>Signed Lecturer ……………………………………………. </p><p>Date ……………………………………………</p>