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Heart Systems V1.0
PRELIMINARYdigital power amplifier module
LearningElectronics Project
Easy,
Fast & Fun...DDDDDiiiiiYYYYY Affordable
and EAF2
Heart Systems
Page 1
The DR100W conCEPT
Welcome to DR100W conCEPT - thePower Amplifier Module. Issue No. sev-enteen is a continuation of isse 15 and16, dealing with the power amplifier - Ishould say, the “digital” power amplifiermodule.
Before that, in case you have not heardabout DR100W conCEPT --- what is it,you may ask.......... well, DR100WconCEPT is conceived basically forLearning analog and digital audio, poweramplifier hardware design, systems ar-chitecture and design and MCU firmwareprogramming.
Nahhh!!! Not those power amplifier youhave seen, the DR100W conCEPT is adiy (do-it-yourself) and fully bundled with:
Figure 1 : The DR100W digital Power amplifier of DR100W conCEPT
- designed for personal taste of stereo audio system- diy Assembly of equalizer, tone control, power amplifier & protection Modules- learning mcu programming- control via I2C protocol / TTL- systems integration & testing- product development
http://www.1diycentre.comNo.18DIY Issue No. Eighteen
Improvement
Power Amplifier Module
LCD display:you can display your name, your girlfriendname or the name of special someone onthe 20x4 LCD, its nice to see someonename “there - on the LCD”.
preset Equalizer/Tone Control:which adds quality to your listening plea-sure with the Turbo Bass - sometimes it iscalled Bass Boost, blended with +/- 14 dBof Bass and Treble. It has a 3D sound alsothat makes the stereophonic emphasis evenwith a close speaker distance. The effectin some “real stereo music” makes the soundrevolving as perceived by our ear.
digital Class D :it is blended with high efficiency digitalPower Amplifier with all the protectionneeded for your Speakers.
conCEPTDR100WEqualizer, Tone Control, PowerAmplifier, MCU Programming
In this issue diy issue 18, we will dis-cuss the Power Amplifier Module - wesimply called it - - - - DR100W_PA.
Preliminary
DR100W
Control ModuleEQ
Music SourcePower Source
Heart Systems V1.0
PRELIMINARYdigital power amplifier module
Page 2
conCEPTDR100WEqualizer, Tone Control, PowerAmplifier, MCU Programming
DR100W conCEPT Building Block
In DIY Issue 15, it discussed the DR100WconCEPT block diagram. Please check the DIYLearning & Improvement issue 15.
In this issue, DIY Learning & Improvement issue18, we will discussed mainly the digital power am-plifier along with the Protection Module, see theshaded block in green of Figure 3 and Figure 4.
To connect the idea of the DR100W conCEPT, youneed to read also DIY Learning & Improvement is-sue 16 which discussed the Equalizer and digitaltone control - the module that will drive the DR100Wpower amplifier, that module is called DR100W_EQ.
ipod
Mobile
MP3/MP4
STB
DR100w_EQ
Equalizer & ToneControl
digital Bass & Treble Left Speaker
RightSpeaker
Music Source Tonal Block Power Amplifier Speakers
Figure 3 : THE DR10W conCEPT simplified Diagram
digital EqualizerRock, Pop, Classic, Jazz &flat
digital Gain
digital Turbo Bassdigital 3D Sound
DR100W_PAClass DPower
Amplifier
Left
Right
DR100W_PMProtection
Module&
Power ControlLeft
Right
ProtectionModule
Woofer
Tweeter
Mid-Range
Control ModuleLCD, keyboard, Home Automation
Remote Control
What’s that calledClass “D”
In learing political science, there is this coursecalled “AB political science”. In Amplfier, there isalso called Class AB - simply, the combination ofclass A and B - a compromised performance for aHi-Fi (High Fidelity) music. In class A, the ampli-fier is in full conduction and consumed much power,it is the best performance in terms of distortion (high-est music fidelity). In class B, the amplifier is offconduction and will conduct only when there is asufficient audio input signal, making less powerconsuption but notorious in distortion (lowest mu-sic fidelity).
To compromise between usage of power and mu
Heart Systems V1.0
PRELIMINARYdigital power amplifier module
INTERFACEKEYs
EEPROM
8051 / AVRcoreMCU
ISP ProgrammingIR
UART BLUETOOTH
MCUINTERFACE 20 x 4
LCD
Left
Right
DR100W_PA DR100W_PM
Left
RightLeftRight
SPEAKER
SPKR OffsetVoltage &Detection
MCUINTERFACE
Power RELAYStandby
MUTE &STANDBY
Left Right
StereoInput
DR100W_EQ
DigitalVOLUME
MCU INTERFACE
PresetEQUALIZER
Left
Right
Left Right
POWERAMPLIFIER
I2C
I2C & Logic LevelSPK1
SPK2DR100W_PM
Figure 4 : THE DR10W conCEPT Detailed Diagram
conCEPTDR100WEqualizer, Tone Control, PowerAmplifier, MCU Programming
Page 3
Heart Systems V1.0
PRELIMINARYdigital power amplifier module
Page 4
conCEPTDR100WEqualizer, Tone Control, PowerAmplifier, MCU Programming
sic fidelity, the class AB scheme is born. If youheard the stereo of your neighbor sounds so good,that is called Hi-fi or High-Fidelity. If, in some in-stances you heard your neighbor complaining be-cause of a 3rd party involved in their relationship,that is called “infidelity”.
So what is Class D? I bet - “D” means digital, notthe big Daddy-D at 1diy. Class D comes with digi-tal processing, not like the class A,B, AB, G and Hand other class which are analog processing.
If it is called digital - it process digitally, and whatbenefit we can get, if it is process digitally? It im-proved the efficiency, the input power from thetransfomer is processed at about 90%, which lesswaste of power loss during the amplification , ascompared to analog processing of about 45% effi-ciency.
In DR100W_PA, we voted the Philips solution(NXP), a chipset claimed to delivered 100Wrms/channel at a specified test condition. The chipsetis the TDA8920BTH - a class D digital amplifier.
There is also called class T. This is another audiodigital amplfier with different digitral processing tech-nology, known as Tripath’s propriety Digital PowerProcessing (DPPTM) Technology, how is that?Google the TA2022 Tripath chipset to know moreabout class T.
How Class D AmplifierWorks?
Philips documented the TDA8920BTH in detailed,pin description, block diagram, processing defini-tion and applications circuit.
I would suggest that you should refer to this docu-ment, TDA8920B (do not use the TDA8920, itshould comes with a “B” like, TDA8920B), that is a34 pages to read and know about the Philips (NXP)TDA8920BTH - digital class D power amplifier.
How Class D differsfrom Class ABPersonally, this is just my own understanding (so,please, if I am not right, please send an email [email protected] and correct my mis-take - “salamat”). Let’s see the block diagram ofanalog process and digital process as shown inFigure 5.
Analog Process:The simplified illustration of analog process is shownin Figure 5 - a. The input signal of sine wave is fedinto the amplifier input stage, it then increased inamplitude by the Driver stage and finally fed forpower amplification by the Output Stage. The out-put stage will generate heat in processing the re-quired amplitude, it requires a heatrsink to effec-tively dissipate the heat, the bigger the heatsinkthe faster the ehat dissipate. If the heat generatedon the output stage will not dissipate and it willcontinue build up, a thermal run-away might occurwhere the output stage will damage. Most ICamplifier have a thermal sensor that will shut downthe amplifier when overheat occurs.
Digital Process:For digital processing, the same sinewave is fedinto the amplifier input stage, the analog siganl isconverted into Pulse Width Modulation (PWM) thenfed into the Control and Handshake block to drivethe High Driver Stage. An external low pass filter isrequired to recover back the digitized analog am-plified sinewave before it can be fed-in across thespeaker.
What is remarkbly noticed with digital amplifier isthat, the heatsink are small, due to the fact that,digital amplifier process the input power by about90%, it means, close 10% is generated as heat,so it reauires smaller heatsink or no heatsink re-quired at all. While in analog process, it requiresheatsink because about 50% of the input power iswaisted and converted into heat.
A good example between analog and digital pro-cess is the Linear and Switch Mode Power Supply(SMPS), the Linear Power supply requires heatsinkto dissipate the wasted power while the SMPS re-quires very little heatsink.
Heart Systems V1.0
PRELIMINARYdigital power amplifier module
Page 5
Figure 5 : Analog versus Digital Process
conCEPTDR100WEqualizer, Tone Control, PowerAmplifier, MCU Programming
InputStage
DriverStage
OutputStage
InputStage
ExternalLC
Filter
PulseWidth
Modula-tion
Control&
Hand-shake
HighDriverStage
Heatsink
(a) Simplified illustration of analog process of power amplifier
(b) Simplified illustration of digital process of power amplifier
Heart Systems V1.0
PRELIMINARYdigital power amplifier module
Page 6
conCEPTDR100WEqualizer, Tone Control, PowerAmplifier, MCU Programming
DR100W_PADesign Source:The DR100W power amplifier schematic diagramis shown in Figure 7. It is basically the same asthe recommended by Philips on Figure 9, page 21of the Philips datasheet.
Well . . . . . Philips makes our design work easyby offering recommended circuit, sounds like plugand play design, making the design EASY, FASTand FUN (but not Affordable since this IC still ex-pensive to us) not like in the 70’s - you start fromscratch. China market offer the component sys-tems . . . . making the whole thing easy.
A “bit” explanation how the TDA8920BTH works according to the DR100W designThe DR100W_PA solution is highly Integrated so-lution packed into a single IC in HSOP24 SMDpackage, see Figure 6 below.
The stereo input signal is fed into the input stagevia pins 8,9 and 5,4 for stereo, and it is internallyprocessed. I do not know “exactly” the signal be-ing processed under the blocks of PWM, Controland Shake and the High Power Driver Stage. WhatI know is that, the analog input signal is convertedinto a PWM with carrier Frequency between 300KHzto 350KHz.
The input signal which is converted into PWM willthen passed to the Control and Handshake blockto drive the High Power Driver stage to provide highlevel switching signal about the same level as thepower supply.
At +28Vdc supply, the output signal at pins 16(and 21) is high power PWM about 28Vrms asshown in Figure 8.
Figure 6 : The TDA8920BTH HSOP 24 Package
From the output waveform, we can see how thePWM react to a varying sinewave input signal. Thewaveform in Figure 7 is low input signal (low level),the waveform shown in Figure 8 is medium inputsignal,
Figure 7 : The PWM output at pin 16
Figure 8 : The PWM output at pin 16 at medium input signal
The waveform in Figure 9 is relatively high inputsinewave signal causing the output nearly at clip-ping. Now, can you see the difference how thehigh powered PWM looks like? We have idea nowhow the processing inside the IC.
Heart Systems V1.0
PRELIMINARYdigital power amplifier moduleconCEPTDR100W
Equalizer, Tone Control, PowerAmplifier, MCU Programming
Another thing you might notice in Figures 7,8 and9 is the Vrms voltage of the PWM, as :
Figure 7 : 28.0 VrmsFigure 8 : 27.9 VrmsFigure 9 : 25.8 Vrms
At low input signal, it consumed just little powerfrom the Power Supply, at high input signal, thesystem will draw large power from the power sup-ply, unfortunately my power supply cannot deliverthe power required by the TDA8920BTH, so thevoltage will drop, the result of this is that, theTDA8920BTH cannot deliver the real power to theload. I conclude then that, a good Power Supplyis required to drive the TDA8920BTH into full power.
Now, the output of TDA8920BTH is high powerdigital PWM as shown in Figure 7,8 and 9 cannotbe used to directly fed into the speaker, otherwiseyour speaker will complain of feeding him an un-clean sinewave signal, just like a baby is expect-ing a milk where in fact you give him a vodka (whata wild explanation, I guess) the baby will definitelycry, for your speaker I guess it will heat up andeventually burned the voice coil.
To return back the sinewave signal, it need a 2ndorder LC filter, the result is shown in Figure 10,indeed, a boosted replica of the input signal.
Figure 9 : The PWM output at pin 16 at nearly the maximum power
What I noticed is that, if you zoomed the signal,you see that, there are other signal “ride on” intothe sinewave as shown in Figure 10, I tried to cap-ture it but then, my camera gone crazy, wheyyyy!see Figure 11.
Figure 10 : Signal across the 4 ohms Load at mid power level
Figure 11 : extra signal across the load
Zoom waveform to see the extrasignal ride on into the Sinewavesignal
Figure 12 : further zoom
Page 7
Heart Systems V1.0
PRELIMINARYdigital power amplifier moduleconCEPTDR100W
Equalizer, Tone Control, PowerAmplifier, MCU Programming
Actually, in real world, the LC filter did not filter out(removed) all the high frequency carrier of the PWM,a 349 KHz signal still “ride” into the 1KHz sinewave,and eventually it fed into the speaker.
Is this good or bad? Definitely it is “not desirable”.This can be minimized by adding another filter whichwill further “filter” the high frequency. With theDR100W_PA design, the system is not perfectbut it can function as it was intended.
The 349 KHz cannot be heard by our ears, it willnot contribute also as high frequency noise (I amtalking to the DR100W_PA hardware including thePCB design), thus, it is accepted.
Here, an output signal of the DR100W_PA whenboth channel driven by 4 ohms load with SMPSpower supply. See Figure 13.
This waveform give us an idea how clean (how dirty)the waveform at a certain voltage swing (6.18 vrms)at the load. This voltage swing at the load pro-vides real power of 9.8Watt for that channel, thatis, 6.18x8.18 / 3.89, my load resistance accord-ing to my ohmmeter is 3.98 ohm. Oh! This is notthe maximum power it can deliver, its just a mid-level power for “soak test” - a test condition thatnormally we used most of the time. This test per-form for 24 hours (1diy standard) and yet, we got awarm heatsink temperature. Oh yeah, 20Wrmsstereo at your home is enough for most users.
Disecting the Design :I should say, lets have the design review............
(a) Removing non-standard capacitorThe design can say low cost, since it removed thoseexpensive components. In the Philips document -Figure 9, page 21 - application schematic, theCapacitor C8, C16 and C38 were removed.
These capacitor requires higher voltage more than60Vdc, for the standard capacitor voltage value inthe market, perhaps it is 20Vdc, and it is expen-sive.
Figure 13 : Output signal - both channel driven at 4 ohms load, how clean the voltage
swing at the load when using a SMPS as power supply and soak test for 24hrs
Figure 14 : Low cost design by removing the high voltage capacitor
Page 8
Heart Systems V1.0
PRELIMINARYdigital power amplifier module
(b) Removing the Ferrite Bead at Supply LineThe Ferrite Bead were also removed, please seeFigure 9, page 21 - application schematic, L1 andL2 Bead.
In our applications, the filter used is 10,000uF / 35volts.
conCEPTDR100WEqualizer, Tone Control, PowerAmplifier, MCU Programming
These components were intended for Power Sup-ply filtering. What is the expected effect after re-moving these components? Well, it remains un-known and to be known after subjecting into anintensive testing including reliability test.
(c) Protection CircuitIn the DR100W concept - this is called ProtectionModule or DR100W_PM. This is a circuit blockthat will prevent the speaker from damage whenthe amplifier gone crazy -- when the dc voltageoutput at the speaker (dc offset voltage) is higherthan what the speaker can handle (frankly, we havenot experienced yet our DR100W amplifier to acti-vate the protection circuit).
Let see the circuit in Figure 7. Google is reallycool, please use it to download the PC1237 or theNTE7100 document because it will help us a lot inthe explanation - a details information can be foundon the datasheet.
In our applications, we decided to use +12V a regu-lator power supply using the LM7812, though theIC can be used up to 60Vdc.
The interesting part here is the Overload function(pin 1) which I am interested how it function andwhat it can do - - - it is unfortunate that, due topatent problem (see page 5 of the NEC document),it is not included.......... The team redefined thefunction of this pin, it says that at 0.6V, it will latchup the relay (break the relay -- like disconnectingthe speaker from the amplifier). Using a TTL signalfrom a MCU of the DR100W_CM, we can com-mand the Protection Module (PM) to forced to dis-connect the speaker from the amplifier by sendinga logic 1 signal, and, at standby mode, we cansend a logic 0 so that the PM will not consume toomuch power.
If you have other external application circuit thatmake pin 1 to function as it was originally con-ceive, or you designed a circuit that can make itwork to “protect” the speaker like Clipping detec-tion, I would be glad if you can share it with us,thank you.
Furthermore, we wanted that every module is su-pervised by the DR100W_CM, our prototype useMCU to reset the PM via its pin 3. When the pin 2detect “+” or “-” high offset voltage, it will discon-nect the speaker. To connect back the speakerwhile making it sure that the dc offset voltage isnot preset, we used MCU. (Actually - is a part ofthe Learning process discussed on DR100W con-cept) but then, we learned that, the uPC1237HAcan do that by itself, so, we let this IC handle theresetting for simplicity.
We used the reset, that, when the dc offset is gone,it will latch (reset itself) without any external trig-ger. The other reset available is that, you need toreset the Protection circuit - power off and poweron the supply.
Figure 14 : Low Cost design by removing the Inductor bead at the power supply
Page 9
Heart Systems V1.0
PRELIMINARYdigital power amplifier module
Page 10
conCEPTDR100WEqualizer, Tone Control, PowerAmplifier, MCU Programming
C210000uF35V
C110000uF35V
R310
Vdda
Vddp
Vssp
Vssa
23
20
17
14 Vddp
Vssp
1
3
12
10Vdda
Vssa
C190.1uF
C200.1uF
C210.1uF
21
22
16
15
Figue 15 : Schematic Diagram - Amplifier Section
VsspVddpVsspVddp
C220.1uF
C260.015F
C230.1uF
C250.1uFC24
0.1uF
C270.68uF
C30220pF
C29220pF
C18220pFC17
220pF
C160.68uF
C150.1uF
C140.015uF
9
C7220pF
C6u47F
C9u47F
R65K6
C8220p
5
4
C12220pF
C10u47F
C13u47F
R75K6
C11220p
8
VsspC50.1uF
24 19 13
8
7
Vssa
RoutLout
2 11L
RG
C30.1uF
R55K6
R430K
C40.1uF
IC1TDA8920BTH
AC
ACGND
R110 R2
10K
R85K6
R910 R10
10R1110 R12
10
VR110K
ac1
ac2
Mode
6
Please refer to PhilipsSchematic Diagram,
Figure 9, page 21 of theTDA8920BTH datasheet(this schematic is not
yet verified by ourTeam)
L1
L2
CON1
CON2
LED1RedD1
1N4007-T
C280.1uF
C310.1uF
22uH
22uH
Heart Systems V1.0
PRELIMINARYdigital power amplifier module
Page 11
conCEPTDR100WEqualizer, Tone Control, PowerAmplifier, MCU Programming
Figue 16 : Schematic Diagram Speaker Protection Section
C35100uF35V
1 2 3 4 5 6 7 8
R1647K
Overload
Latch / Reset
Offset D
etect
AC O
ff Detect
GND
Relay D
river
Vcc ON
VCC
R153K3
R1847K
R1947K
Rout
Lout
C39100uF16V
+12V
ac2
ac1
+12V
D31N4007
D41N4007
D51N4007
IC2LM7812
IC3uPC1237 / NTE7100
C38100uF16V
C374u7F16V
SPK14 Ohms
SPK24 Ohms
RLY1Relay
R1710K
+12V
C364u7F16V
Mode
R135K6
R145K6
Vssa
D25V6
C31100uF16V
Please refer to NECuPC1237 SchematicDiagram and applica-
tions, This schematic isnot yet verified by our
Team)
CON3
Heart Systems V1.0
PRELIMINARYdigital power amplifier module
Page 12
conCEPTDR100WEqualizer, Tone Control, PowerAmplifier, MCU Programming
DR100W_PAPower Requirements
According to Philips specifications, you must usea voltage of +/-12.5 to +/-30Vdc for the operation ofthe TDA8920BTH.
That is the voltage, what about the current? Thespecifications did not “really specify” the currentneeded to produce a desired output.
For example, it says that, at +/-27Vdc with 4 ohmsspeaker load, you can get 86W with a 10% distor-tion, again, what is the current needed? Or, whatwould be the transformer current rating to producethis power?
Our visiting friend (a former 1diy member) makehis hand dirty on our work bench, his test showwith different power transformer as shown in Figure17.
He noticed that, EI and Toroid transformer will tendto decreased the voltage being supply to theDR100W_PA board at maximum power, he con-cluded that, these power transformer cannot de-liver the exact “power” the TDA8920BTH requires.(Pertaining to our transformer only, EI core = 18-0-18Vac @ 3 Amp., Toroid = 20-0-20Vac, 250W,SMPS = 30-0-30Vdc @ 3.5 Amp)
Please note, however that, this is only true at maxi-mum output signal, where, in reality, you will notgoing to maximized your power amplifier alwaysfor a normal listening pleasure, unless, you are inthe battle of the band and strictly hate that yourPA cannot deliver 100Wrms per channel.
Only the Switch Mode Power Supply (SMPS) candeliver the greatest power, but still cannot obtainedthe 100Wrms per channel at 4 ohms load (200WrmsStereo) as specified by DR100W conCEPT speci-fications, not even the Philips (NXP) specificationsof 86Wrms per channel.
Well.... well... well.... I will leave that for the Tweakand Modifications (if there is any) - something thatwe can diy to do - to perform trial and error modifi-cations with an aim to improved it.
Figure 17 : Using different transformer to power the DR100W_PA
Heart Systems V1.0
PRELIMINARYdigital power amplifier module
DR100W_PA Tweak & Modification
The DR100W power amplifier circuit design is notperfect in terms of performance and specifications,thus, a room for improvement is “waiting” on tehcurrent design.
If you like to make it the best, you need to adjustsome component value, perhaps add componentsand see if you can benchmark or supass the Philipsspecifications described in their datasheet.
Those values and modification, we do not know yet,but we will play around with this module, we willdo Trial and Error to make it the best - at least tomy level and expectation as diyers.
conCEPTDR100WEqualizer, Tone Control, PowerAmplifier, MCU Programming
DR100W_PA conCEPTRequirement for PAThe DR100W conCEPT requires that, the poweramplifier can be controlled with :
(a) Standby(b) Mute
In Figure 16, you can find the mode control but notspecified exactly how to use it. Going back toPhilips datasheet, on page 21 Figure 9, pleaselook at S1 and S2, when S2 is close which forcedpin 6 to logic zero, the amplifier will be in thestandbymode.
If S2 is closed, the mode pin will be in Mute state.By design, we can also perform a digital mute onthe part of the DR100_EQ - which we believe abetter choose of mute. Real life applications willdictate which mute will be used.
Mode
R145K6
Vssa
D25V6
C3147uF16V
R135K6
Rs100
Rm5K6
Mute
Standby
Intel 8051Core MCU
DR100W_CMControl Module
Figure 18 : Implementing Mute and Standby control on the DR100W_PA circuit
Standby mode
active mode
Page 13
Heart Systems V1.0
PRELIMINARYdigital power amplifier moduleconCEPTDR100W
Equalizer, Tone Control, PowerAmplifier, MCU Programming
Diy Constructing theDR100W PA
Here we go............. make our hands dirt, readyfor the manual insertion and assembly.
<<<<sorry for the inconvenience, the assemblyinstruction is under cooking, we will publishedvery soon>>>>>
To be Continued.......
Page 14
Heart Systems V1.0
PRELIMINARYdigital power amplifier moduleconCEPTDR100W
Equalizer, Tone Control, PowerAmplifier, MCU Programming
APPENDIX
Page i
Heart Systems V1.0
PRELIMINARYdigital power amplifier moduleconCEPTDR100W
Equalizer, Tone Control, PowerAmplifier, MCU Programming
DR100W conCEPT Learning Platform
Heart Systems - the “tiny” company located inBaguio City, who established the 1diyTeam, pro-mote & support : diy Learning, it created sev-eral low cost Trainer Kit platform generally forlearning hardware design and interfacing, MCU pro-gramming and systems integration - - targettingthe Starters with zero background.
The DR100W conCEPT is the latest platform inthe field of Audio and Music reproduction.
What do we have here? The conCEPT will let youlearn the following :
Audio :Equalization reproduction with different mode ,Rock, Classical, Pop, Jazz (hardware)Effects : Turbo Bass and 3D SoundBass and TrebleDigital gain, volume and balance controlDigital Power Amplifier
Hardware :Digital processing technique control by I2CAnalog and digital InterfacingModular and Systems IntegrationSolutions to Noise and IssuesHardware and Software compromise and optimizationHardware assembly / debugging
MCU Programming (Software) :Man Machine Interface (MMI) implementationI2C Protocol and logic control, UARTLCD DisplayingProgramming technique and problem solving
Testing :Parametric Test, Tone Control signal testingHardware & Software Test / Reliability TestAutomatic Test Equipment (ATE)
Project Management:Project MilestoneLadder Systems Product Development
We are talking to our brilliant fellow hobbyist tohelp us to deliver this Trainer Platform.
Digital Audio ToneControl (DATC) Trainer KitDigital Audio
STARTERMCU-EB8051Assembly LanguageGeneral Trainer Kit
H o b b y i s tCentral OfficeS i m u l a t o r(Hob-COS)Trainer KitTelephony
Night Eyes SecuritySystems V2(NE2ss) Trainer Kit (Security)
Figure i : THE 1diy Learning Platform - Proudly made by true blooded hobbyist for the
general Hobbyist courseware & shareware
Page ii
Heart Systems V1.0
PRELIMINARYdigital power amplifier module
Page iii
Photo Gallery :
Engineering Design - LSPD1 :Digital Tone Control and Volume Control
Engineering Design - LSPD1 :Checking the Equalizer Performance
Engineering Design - LSPD1 :Writing its program Hand Made Sample - LSPD2 :
The finished EQ on its standard PCB
Hand Made Sample - LSPD2 :Testing the EQ with Avril Lavigne Concert
conCEPTDR100WEqualizer, Tone Control, PowerAmplifier, MCU Programming
Heart Systems V1.0
PRELIMINARYdigital power amplifier module
Page iv
Hand Made Sample - LSPD2 :Testing a candidate Power Amplifier : Class AB
Hand Made Sample - LSPD2 :Testing a candidate Power Amplifier : Class D
Hand Made Sample - LSPD2 :Let’s see some MMI (Man Machine Interface)
conCEPTDR100WEqualizer, Tone Control, PowerAmplifier, MCU Programming
Final Sample - LSPD3 :Testing the TDA8920BTH : Class D TDA8920BTH
Final Sample - LSPD3 :Testing the TDA8920BTH : Live Audio Test
Final Sample - LSPD3 :Testing the TDA8920BTH : Soak Test
Heart Systems V1.0
PRELIMINARYdigital power amplifier module
Page v
Kit Version :The 1diyTEAM create an investment to get the com-plete materials for the DR100W conCEPT - spe-cially packed for Audio Hobbyist who would like tobuild the DR100W, Learn Software programming,systems integration, solving issues such as noise.. . . . . . . . . . . in general - anyone who would liketo feel and experienced the adventure with theDR100W conCEPT.
The Kit version will include the major hardware,such as :
a) Equalizer : EQb) Control Module : CM
and you can select the Power Amplifier Module (PA)based on your preference Power Output :
a) 10W Stereob) 40 Watts Stereoc) 200 Watts Stereo (official PA)
Feedback :We thank those guys who will feedback about ourDR100W conCEPT. I’ll be glad to hear from yourcomment, improvement and redesign - makingthe DR100W conCEPT a better Trainer Kit :[email protected]
d’ TEAM :Thanks to these guys - the dr100wTEAM :
Project Manager /Systems Architecture : F. DandySystems Integration : ArielSoftware Engineer : RomelTest / Hardware Engr. : Bryan / NoliMaterial Sourcing : Anna Chen
http://www.1diycentre.com
Final Sample - LSPD3 : 2 Channels DrivenTesting the TDA8920BTH : Max Output before Clip*** over voltage beyond supply max limit test ***
conCEPTDR100WEqualizer, Tone Control, PowerAmplifier, MCU Programming
Final Sample - LSPD3 :Testing the TDA8920BTH : EI Transformer
Final Sample - LSPD3 :Testing the TDA8920BTH : Torroid Transformer
myhobby Educational TrainerEAF2 Electronics SeriesHeart
Systems
Heart Systems V1.0
PRELIMINARYdigital power amplifier module
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HEART SYSTEMS
HEART SYSTEMS
HEART SYSTEMS
HEART SYSTEMS
HEART SYSTEMS
Digital Audio Tone Control.............................................
Digital Audio Tone Control( DA( DA( DA( DA( DATC )TC )TC )TC )TC )
------- DATC Version 1.5 -------
The Digital Audio Tone Control (DATC) isanother Educational Trainer - Project fromHeart Systems. The DATC can be use as aTrainer Kit for studying the 8051 core softwareapplication on digital Audio. The 8051 proces-sor is In-System Programming with 8K bytesof Flash Programmable ROM.
DATC Features:- MicroProcessor Controlled using the ATMEL AT89S52 (PLCC)- Using Digital Audio Processors : SGS Thomson - ST TDA7442 with Surround Effects- Push button adjustment of Volume, Bass and Treble- Push button Power On/Off- Push button Music / Surround Selection- Infrared Remote Control- 16x2 LCD with amber backlight- Stereo VU meter (optional)- Stereo Internal Headphone amplifier- 14 dB of Boost/ Cut Treble- 14 dB of Boost/ Cut Bass- Music Surround Sound On/Off Selection- Mode : Music / Simulated- 4 Stereo Inputs - RCA Jacks- 1 Stereo Outputs - RCA Jacks- Last Setting Memory- Real Time Clock- Programmable Turn on (automatic turn on)- Programmable Turn off (automatic turn off)- User's Programmable Control (User can program the Processor)- MCU programming on board (ISP)- External Control via Relay of amplifier Power Supply- External Control via Relay of Amplifier Speaker Systems- Power Supply Requirements : 12 Vdc @ 500 mAmps
Revival DATC
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do diy MP3 Player for DATCdigital Tone Control