Department of electrical and computer engineering Guitar ...€¦ · Conclusion and Recommendations...
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Conclusion and Recommendations In summary, this team has designed a development board tailored to experimenting with and implementing guitar pedals. The final product will double as a multi-effects guitar pedal that a musician can use as this musician would use any other guitar pedal, the only caveat being that the musician must create the circuit(s) for the pedal(s). All stages of this device have been designed, simulated, and tested in a simulated environment. The motherboard has been laid out such that all PCB sizes have been established. At this point in the project, the team can begin testing circuits on breadboards and designing PCBs for the final product. A verification and validation plan has been established to properly test the device and ensure it meets all client requirements. Once this major milestone is accomplished and the team has a finished product for the Guitar Pedal Development Board, the team will use this device to design and implement a Fuzz-Overdrive pedal. The client has request that this pedal be specifically design to overdrive a unity gain transformer as its saturation characteristics past its linear mode of operation are superior to those of a transistor. Guitar Pedal Development Board Department of electrical and computer engineering References “Adafruit Industries LLC 64 - Breadboard.” DigiKey, Adafruit, www.digikey.ca/product- detail/en/adafruit-industries-llc/64/1528-2182-ND/7241427. “Adafruit Industries LLC 239.” DigiKey, Adafruit, www.digikey.ca/product- detail/en/adafruit-industries-llc/239/1528-2143-ND/7244929. Butler, Brent K. “US5022305A - Tube Overdrive Pedal Operable Using Low Voltage DC Battery Eliminator.” Google Patents, Google, 20 Apr. 1984, patents.google.com/patent/US5022305A/en. Francis, Otis M. “FOOT PEDAL APPARATUS TO PROVIDE VARIABLE OUTPUT FOR ELECTRIC GUITAR.” Canadian Patents Database, Smart & Biggar, 18 Jan. 2008, www.ic.gc.ca/opic-cipo/cpd/eng/patent/2618161/summary.html?query=guitar+ pedal&type=basic_search. “Holy Stain Distortion/Reverb/Pitch/Tremolo Multi-Effect.” Electro-Harmonix, www.ehx.com/products/holy-stain. Moller, Andreas. “True Bypass Wiring Schemes.” Stinkfoot.se, 23 Aug. 2014, stinkfoot.se/archives/2233. “Proto-Pedal.” PRT-13124 - SparkFun Electronics, www.sparkfun.com/products/13124 . “Thunderdrive Deluxe LTD.” Mod Kits DIY, www.modkitsdiy.com/pedal/thunderdrive- deluxe-ltd. SolidWorks CAD Models https://www.digikey.com/product-detail/en/bourns-inc/PDA241-SRT00-254A2/PDA241- SRT00-254A2-ND/3781541 https://www.digikey.ca/product-detail/en/switchcraft-inc/RA49C12A/SC1862-ND/1289117 https://copal.partcommunity.com/3d-cad-models/sso/8p-nidec-copal-electronics- corporation?info=copal%2Ffujisoku_products%2Fpush_switches%2F8p_series_asmtab.prj&cwi d=6843 https://www.digikey.ca/product-detail/en/mill-max-manufacturing-corp/801-43-012-10- 012000/ED6536-12-ND/1212361 https://www.digikey.ca/product-detail/en/samtec-inc/IPBS-102-01-T-S/SAM15687- ND/6613482 https://www.digikey.ca/product-detail/en/w%C3%BCrth-elektronik/691361100006/732- 2755-ND/2508524 Team 12 Dylan Blatt, Yutong Wei, & Wenxuan Zhou Input / Output jack Design Process & Architecture The total diagram is shown above. Observe that the input buffer is implemented to isolate the input signal. The noise gate is utilized to block noise caused by DC voltage and guitar pickups. 3 development ports are used to experiment with circuits. The output buffer transfer signal to an amplifier. The total system is powered by a power management system which can convert 110V AC input into 9V, 3V, 4.5V and 6V DC output. Introduction Our client has requested a device that can be used by both guitar pedal designers and musicians. The designer should be a development board whose sole purpose is implement circuits for guitar pedals. As such, the designer need not concern him or herself with input connection, preliminary stages, preceding stages, nor output connection since the device shall include all such stages. The designer can therefore implement a circuit and then immediately test it by connected a guitar and amplifier to the device. Additionally, a musician can use this device as a multi-effect pedal, assuming some circuit has been implemented in the device. A logical layout of footswitches, knobs, LEDs and jacks for power, guitar, and amplifier will be used to facilitate ease-of-use for the musician. Finally, as an example, a Fuzz-Overdrive pedal will be designed and implemented using this device. The Overdrive characteristics will aid in reducing negative, sonic qualities of the Fuzz pedal, in specific muddiness. Furthermore, this Fuzz-Overdrive pedal will incorporate a unity gain transformer as part of its design as this unity gain transformer will be overdriven. ¼” TS jack is mono and has three terminals. This jack, seen in Appendix B, table 1, is designed for to interface with a male ¼” TS jack from a guitar. The terminal 1 is connected to the ground wire and terminal 2 is the signal line carrying output of the guitar to the GPDB. Output Buffer This kind of buffer has a strong load capacity and current amplification characteristic. It will isolate the guitar signal and make processing effective and create a clean signal. The TL072 operating amplifier is used in this design. Input Buffer Power Supply Noise Gate The power supply powers the entire device. The power conversion submodule converts a 110V AC input signal into 9V DC voltage. Then, the voltage divider module divides the 9V DC voltage into 4.5V, 3V, 6V, DC voltage to power the remaining stages of the device. The noise gate, can block DC voltage noise in the signal. It can filter 3.535mV noise and its attenuation factor is set to 10. The attack of the gate is set to 5ms and the hold of gate is 5 -10ms. The SSM2167 IC is used in this implementations The output buffer is unity gain and transfer the signal to an amplifier with low output resistance. It is designed similarly to the input buffer. Motherboard Floorplan The general layout of the motherboard for the guitar pedal development board has been modeled in SolidWorks. Directly mounted elements: input and output jacks and the development ports. Indirectly mounted elements: input and output buffer and the noise gate. PCB sizes: Motherboard PCB: 177.8 x 241.3 mm or 7 x 9.5 in Dev. Port Size: 63.5 x 88.9 mm or 2.5 x 3.5 in Output Buffer: 32.98 x 55 mm In Buffer: 32.98 x 50.24 mm Noise Gate: 32.98 x 45.15 mm
Transcript of Department of electrical and computer engineering Guitar ...€¦ · Conclusion and Recommendations...
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ConclusionandRecommendationsInsummary,thisteamhasdesignedadevelopmentboardtailoredto
experimentingwithandimplementingguitarpedals.Thefinal
productwilldoubleasamulti-effectsguitarpedalthatamusician
canuseasthismusicianwoulduseanyotherguitarpedal,theonly
caveatbeingthatthemusicianmustcreatethecircuit(s)forthe
pedal(s).Allstagesofthisdevicehavebeendesigned,simulated,and
testedinasimulatedenvironment.Themotherboardhasbeenlaid
outsuchthatallPCBsizeshavebeenestablished.Atthispointinthe
project,theteamcanbegintestingcircuitsonbreadboardsand
designingPCBsforthefinalproduct.Averificationandvalidation
planhasbeenestablishedtoproperlytestthedeviceandensureit
meetsallclientrequirements.
Oncethismajormilestoneisaccomplishedandtheteamhasa
finishedproductfortheGuitarPedalDevelopmentBoard,theteam
willusethisdevicetodesignandimplementaFuzz-Overdrivepedal.
Theclienthasrequestthatthispedalbespecificallydesignto
overdrive aunitygaintransformerasitssaturationcharacteristics
pastitslinearmodeofoperationaresuperiortothoseofatransistor.
Guitar Pedal Development BoardDepartment of electrical and computer engineering
References“AdafruitIndustriesLLC64- Breadboard.” DigiKey,Adafruit,www.digikey.ca/product-
detail/en/adafruit-industries-llc/64/1528-2182-ND/7241427.
“AdafruitIndustriesLLC239.” DigiKey,Adafruit,www.digikey.ca/product-detail/en/adafruit-industries-llc/239/1528-2143-ND/7244929.
Butler,BrentK.“US5022305A- TubeOverdrivePedalOperableUsingLowVoltageDC
BatteryEliminator.” GooglePatents,Google,20Apr.1984,
patents.google.com/patent/US5022305A/en.
Francis,OtisM.“FOOTPEDALAPPARATUSTOPROVIDEVARIABLEOUTPUTFOR
ELECTRICGUITAR.” CanadianPatentsDatabase,Smart&Biggar,18Jan.2008,
www.ic.gc.ca/opic-cipo/cpd/eng/patent/2618161/summary.html?query=guitar+
pedal&type=basic_search.
“HolyStainDistortion/Reverb/Pitch/TremoloMulti-Effect.” Electro-Harmonix,
www.ehx.com/products/holy-stain.
Moller,Andreas.“TrueBypassWiringSchemes.” Stinkfoot.se,23Aug.2014,
stinkfoot.se/archives/2233.
“Proto-Pedal.” PRT-13124- SparkFun Electronics,www.sparkfun.com/products/13124.
“Thunderdrive DeluxeLTD.”ModKitsDIY,www.modkitsdiy.com/pedal/thunderdrive-deluxe-ltd.
SolidWorksCADModels
https://www.digikey.com/product-detail/en/bourns-inc/PDA241-SRT00-254A2/PDA241-SRT00-254A2-ND/3781541
https://www.digikey.ca/product-detail/en/switchcraft-inc/RA49C12A/SC1862-ND/1289117
https://copal.partcommunity.com/3d-cad-models/sso/8p-nidec-copal-electronics-corporation?info=copal%2Ffujisoku_products%2Fpush_switches%2F8p_series_asmtab.prj&cwid=6843
https://www.digikey.ca/product-detail/en/mill-max-manufacturing-corp/801-43-012-10-012000/ED6536-12-ND/1212361
https://www.digikey.ca/product-detail/en/samtec-inc/IPBS-102-01-T-S/SAM15687-ND/6613482
https://www.digikey.ca/product-detail/en/w%C3%BCrth-elektronik/691361100006/732-2755-ND/2508524
Team 12Dylan Blatt, Yutong Wei, & Wenxuan Zhou
Input / Output jack
Design Process & Architecture
Thetotaldiagramisshownabove.Observethattheinput
bufferisimplementedtoisolatetheinputsignal.Thenoise
gateisutilizedtoblocknoisecausedbyDCvoltageandguitar
pickups.3developmentportsareusedtoexperimentwith
circuits.Theoutputbuffertransfersignaltoanamplifier.The
totalsystemispoweredbyapowermanagementsystem
whichcanconvert110VACinputinto9V,3V,4.5Vand6VDC
output.
IntroductionOurclienthasrequestedadevicethatcanbeusedbybothguitarpedaldesignersandmusicians.Thedesignershouldbeadevelopmentboardwhosesolepurposeisimplementcircuitsforguitarpedals.Assuch,thedesignerneednotconcernhimorherselfwithinputconnection,preliminarystages,precedingstages,noroutputconnectionsincethedeviceshallincludeallsuchstages.Thedesignercanthereforeimplementacircuitandthenimmediatelytestitbyconnectedaguitarandamplifiertothedevice.Additionally,amusiciancanusethisdeviceasamulti-effectpedal,assumingsomecircuithasbeenimplementedinthedevice.Alogicallayoutoffootswitches,knobs,LEDsandjacksforpower,guitar,andamplifierwillbeusedtofacilitateease-of-useforthemusician.Finally,asanexample,aFuzz-Overdrivepedalwillbedesignedandimplementedusingthisdevice.TheOverdrivecharacteristicswillaidinreducingnegative,sonicqualitiesoftheFuzzpedal,inspecificmuddiness.Furthermore,thisFuzz-Overdrivepedalwillincorporateaunitygaintransformeraspartofitsdesignasthisunitygaintransformerwillbeoverdriven.
¼”TSjackismonoandhasthreeterminals.Thisjack,seenin
AppendixB,table1,isdesignedfortointerfacewithamale¼”
TSjackfromaguitar.Theterminal1isconnectedtotheground
wireandterminal2isthesignallinecarryingoutputofthe
guitartotheGPDB.
Output Buffer
Thiskindofbufferhasastrongloadcapacityandcurrent
amplificationcharacteristic.Itwillisolatetheguitarsignaland
makeprocessingeffectiveandcreateacleansignal.TheTL072
operatingamplifierisusedinthisdesign.
Input Buffer
Power Supply
Noise Gate
Thepowersupplypowerstheentiredevice.Thepower
conversionsubmoduleconvertsa110VACinputsignalinto9V
DCvoltage.Then,thevoltagedividermoduledividesthe9VDC
voltageinto4.5V,3V,6V,DCvoltagetopowertheremaining
stagesofthedevice.
Thenoisegate,canblockDCvoltagenoiseinthesignal.Itcan
filter3.535mVnoiseanditsattenuationfactorissetto10.The
attackofthegateissetto5msandtheholdofgateis5-10ms.
TheSSM2167ICisusedinthisimplementations
Theoutputbufferisunitygainandtransferthesignaltoan
amplifierwithlowoutputresistance.Itisdesignedsimilarlyto
theinputbuffer.
Motherboard Floorplan
Thegenerallayoutofthemotherboardfortheguitarpedal
developmentboardhasbeenmodeledinSolidWorks.Directly
mountedelements:inputandoutputjacksandthe
developmentports.Indirectlymountedelements:inputand
outputbufferandthenoisegate.PCBsizes:MotherboardPCB: 177.8x241.3mmor7x9.5inDev.PortSize: 63.5x88.9mmor2.5x3.5inOutputBuffer: 32.98x55mmInBuffer: 32.98x50.24mmNoiseGate: 32.98x45.15mm
http://www.digikey.ca/product-%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20detail/en/adafruit-industries-llc/64/1528-2182-ND/7241427http://www.ic.gc.ca/opic-cipo/cpd/eng/patent/2618161/summary.html?query=guitarhttp://www.ehx.com/products/holy-stainhttp://www.sparkfun.com/products/13124http://www.modkitsdiy.com/pedal/thunderdrive-%20%09deluxe-ltdhttps://www.digikey.com/product-detail/en/bourns-inc/PDA241-SRT00-254A2/PDA241-SRT00-254A2-ND/3781541https://www.digikey.ca/product-detail/en/switchcraft-inc/RA49C12A/SC1862-ND/1289117https://copal.partcommunity.com/3d-cad-models/sso/8p-nidec-copal-electronics-corporation?info=copal%2Ffujisoku_products%2Fpush_switches%2F8p_series_asmtab.prj&cwid=6843https://www.digikey.ca/product-detail/en/mill-max-manufacturing-corp/801-43-012-10-012000/ED6536-12-ND/1212361https://www.digikey.ca/product-detail/en/samtec-inc/IPBS-102-01-T-S/SAM15687-ND/6613482https://www.digikey.ca/product-detail/en/w%C3%BCrth-elektronik/691361100006/732-2755-ND/2508524
