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Team I: Nick Seliga, Robert Stanton, Amer Dalaq , and Logan Sammons

Guitar Amplifier with Bluetooth Input. Team I: Nick Seliga, Robert Stanton, Amer Dalaq , and Logan Sammons. Block Diagram and Work Breakdown Structure. Battery – Robert Preamp – Nick Amplifier – Amer Bluetooth - Logan. Project Milestones. Design working on a breadboard

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Team I: Nick Seliga, Robert Stanton, Amer Dalaq , and Logan Sammons

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  1. Guitar Amplifier with Bluetooth Input Team I: Nick Seliga, Robert Stanton, AmerDalaq, and Logan Sammons

  2. Block Diagram and Work Breakdown Structure • Battery – Robert • Preamp – Nick • Amplifier – Amer • Bluetooth - Logan

  3. Project Milestones • Design working on a breadboard • Design completed and functional on a prototype PCB • Fully completed functional prototype

  4. Why Bluetooth? Allows the customer to stream music over the portable amplifier’s speakers, resulting in the ability to play over the streamed track.

  5. Signal Flow • From Handheld Device (Cell Phone, iPod, MP3 Player) • Through RN-52 Bluetooth Device • Out to Amplifier to be Mixed With Input Guitar Signal

  6. Bluetooth Features • Operating Frequency 2.4 – 2.48 GHz • Maximum Data Rate 3 Mbps (Typically mp3 is 256 Kbps) • Operation Range 10 m or 32.81 ft. • Supply Voltage 3.0V to 3.6 V • Working Current 30 mA • Standby Current 0.5 mA • Ability to be programmed using UART through micro-USB • Firmware upgrade ability using micro-USB • Volume Control with potentiometer connected to output of Bluetooth module before amplifier • Ability to tell whether Bluetooth module is connected using blue LED (Blinking when able to connect & Off when connected)

  7. Detailed Schematic

  8. Testing Bluetooth • Test manufacturer’s specifications on range of operation. • Test functionality of all programmed inputs/outputs. • Test built in protection for interference in operating frequency range (Wifi). • Test quality of output signal before amplifier to insure no noise introduced by potentiometer volume control. • Test amp draw of circuit when streaming audio to amplifier as well as when in standby mode for battery efficiency considerations. • Select value of potentiometer so that range of volume is maximized from high resistance to low resistance.

  9. Guitar Preamp • Responsible for shaping the sound of the guitar portion of the amplifier • Uses 3 potentiometers for tone, gain, and volume control • High input impedance, which guitar pickups are intended to feed • Operates on 5 V

  10. Preamp Schematic • Fairchild Semiconductor MMBFJ201 n-channel JFET • Texas Instruments LME49740 high performance, high fidelity audio op-amp; other channels to be used as summing amplifiers

  11. Power Amplifier (MAX9710) • Will use summing amplifiers (LME49740) to combine the Bluetooth signal and the guitar signal • Stereo amplifier and summing amplifier operates at a range of ~5 V • Output ~2.6 W for each 4 Ω load (speaker) • Built-in thermal load protection • When the junction temperature reaches 160⁰ C, the amplifier output stage is disabled until the temperature cools by 15⁰ C. • Has low harmonic distortion of 0.01% • Low-Distortion amplification of the audio signal

  12. Power Amplifier Schematic

  13. Power Amplifier Testing • Power amplifier will be constructed on its own testing board • Circuit will be built on a bread board with components • Circuit will then be connected with the preamp stage and test if the guitar signal works and sounds good • Measure the output current and voltage to make sure the right output is being achieved

  14. Battery and Distribution

  15. Batteries and Protection Circuit • Two Lithium Batteries in Series • Tenergy 2200 mAh 51mm x 50.5mm • Overcharge, Undercharge and Overcurrent protection from S-8242 IC • N channel MOSFETs provide S-8242 ability to control battery protection • Over/under voltage preset by IC and can be varied slightly by R1 and R7 • Overcurrent limit set by Rt8 and R7

  16. AC Adapter and ESD Protection • Common 5.5 mm x 2.1 mm DC Power Jack • Zener diode with 20 V breakdown voltage

  17. Distribution • MCP 16321 provides efficient and precise voltage regulation for Amplifier Section • Provides lower secondary overcurrent and under voltage protection • Provides over temperature protection • Voltage Divider and BJT provide voltage regulation for Bluetooth’s 30 mA load

  18. Battery Level Indicator • VCO detects battery voltage and controls LED • Vbatt > 6.6 V, VCO will have frequency > ~17 Hz • Vbatt < 6.6 V, VCO will have frequency < ~17 Hz • Vbatt ~= 6.1 V, VCO frequency ~= 1 Hz

  19. Components per Product

  20. Enclosure Parts LED Switch ¼” Audio Jack LED Pushbutton Panel Mount Potentiometer w/PCB pins 1/8” Audio Jack DC Jack

  21. Questions?

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