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1. Shanghai 852 2319 2212 Tel Rm 1004 1005 Astronautics Bldg 852 23 19 2004 Fax Southwest U S Office No 222 Cai Xi Rd 8 Corporate Park Xu Hui District Europe Office Suite 300 Shanghai 200233 Behringstrasse 10 Irvine CA 92606 China D 82152 Planegg 714 442 8384 Tel 021 648 20697 Tel Germany 714 442 8338 Fax 021 648 22286 Fax 49 89 899 30193 Tel 49 89 899 0399 Fax 26 Integrated Silicon Solution Inc VP005 1E 12 10 972. The ADPCM encoding is started by selecting the ACODING sub command A The number of phrases will be asked for Type in the number of sound files to be programmed into the 1522 011 020 device After reading the number the file names will be requested Type in the sound files you have edited but do not use extension The software will then ask for option information and simply answer yes or no to set each option The ADPCM encoding software will merge all the sound files and option information to form new data file with the extension DPM which is then ready for programming into the IS22C011 020 device After each ADPCM encoding a log file with a extension will be generated which records the information for ADPCM encoding including a sound file for each phrase the option settings the start and end address of each phrase etc 18 Integrated Silicon Solution Inc VP005 1E 12 10 97 Application Note VPO01 Instant Voice ROM Products ISSI Several new files are generated after ADPCM encoding They are listed below e filename DPM encoded sound data and option information to be written into the IVR chip e filename LOG log file with the details of the DPM sound data file e filename QAN emulation of compressed sound in the VOC format The user can listen to this file and hear the sound which is very similar to the chip s output Playback of Multiple Phrase Sound playback is
3. at approximately 8000 Hz Therefore the sampling rate setting is very simple The built in oscillator is specially designed for high stability The oscillator frequency remains constant at all supply voltages within the allowable range of the product specification As a result the sound quality will not decay as the battery voltage falls off with use 6 Integrated Silicon Solution Inc VP005 1E 12 10 97 Application Note VP01 Instant Voice ROM Products ISSI User Programmable Options Each IVR can be user programmed with different options During ADPCM coding the software will merge the option information with the sound data With this feature the user can try different options quickly and easily For the type of available options please consult the device data sheet or the Selectable Option Section of this application note page 64 Wide Supply Voltage Range and Power Saving IVRs utilize CMOS technology so a single power supply from 2 4V to 6 0V is allowed After sound playback the chip will power down automatically and enter the standby mode requiring very low current Even a coin cell can supply power to the IVR for some time making many small and compact applications possible Direct LED Drive There are two output pins designed to directly drive a single LED If more than two LEDs or higher power lamps are used an external transistor can be added Current Mode D A Output Current mode D A output COUT makes i
4. either a speaker or buzzer IVRs Compared to Mask Programmed Voice ROM Conventional voice ROM utilizes mask ROM technology to store sound data A semiconductor manufacturing photo mask corresponding to the sound data has to be made With this mask the sound data can be permanently programmed to the memory during wafer fabrication Itis this requirement of mask making and wafer fabrication that makes the mask ROM approach inflexible Mask making and wafer fabrication are both time consuming Normally it takes several weeks to get the first masked devices ready for delivery The cost of making this special mask is always directly or indirectly paid by customer and is the so called Non Refundable Engineering NRE charge for making a particular sound code There is also a Minimum Order Quantity MOQ requirement because each wafer fabrication house has its minimum manufacturing lot size MOQ may vary from one company to another but normally it is around 10K for each sound code Integrated Silicon Solution Inc 3 VP005 1E 12 10 97 Application Note VP01 Instant Voice ROM Products ISSI IVR on the other hand does not suffer from these drawbacks of sound ROMs First the IVR is based on OTP EPROM technology Sound data is programmed into the memory by an electrical signal so no special expensive optical mask is needed Also users can quickly generate and program sound data using one of our user friendly development systems within the
5. on the PCB If the programming is successful the COB is then encapsulated Otherwise the COB should be examined and if necessary be UV erased contact 1551 for special instructions concerning UV erase and reworked Please note 12 Integrated Silicon Solution Inc VP005 1E 12 10 97 Application Note VP01 Instant Voice ROM Products ISSI that in order to be UV erasable the working environment should be very clean Dust on the memory area of the chip will cover some memory cells and block the UV light and stop erasure Using the 551 copier low cost in house mass programming is possible Production volume is very flexible and totally controlled by the users Delivery of course is not a problem once the users have a stock of blank IVRs Large Volume IVR Programming If a particular sound is to be programmed in a quantity of more than a few thousands it may be more economical to purchase pre programmed IVRs SSI offers a factory programming solution for high volume production so that during wafer testing the sound data which was submitted to 55 and approved by the customer will be programmed onto the IVR The shipped devices will be die with sound data pre programmed which is very similar to buying a sound ROM However there is no NRE charge and no long lead time The quantity will be a multiple of the number of good die per wafer so there is no MOQ issue IVR Standalone Record and Playback Programmer The 55 IS22VP002
6. triggered by applying a HIGH signal 1 voltage VCC to the four triggering pins S1 S2 S3 and S4 Up to eight phrases can be stored in the chip These are triggered by four pins and the table below shows the coding required to trigger each phrase Phrase Trigger Pin one Sl two 52 53 four S4 five S1 and S2 SIX S2 and S3 seven S3 and S4 eight S1 and S4 Integrated Silicon Solution Inc 19 VP005 1E 12 10 97 Application Note VP01 Instant Voice ROM Products ISSI Figure 9 shows the circuit diagram for triggering all eight phrases The first four phrases are triggered by switches SW1 to SW4 These are simple single pole push buttons Use switches SW5 to SW8 for phrases five to eight These are double pole push buttons Both types of buttons can be implemented by a custom PCB layout and rubber contacts for minimum cost Figure 9 Multiple Phrase Trigger Circuit 20 Integrated Silicon Solution Inc VP005 1E 12 10 97 Application Note VP01 Instant Voice ROM Products ISSI Section VI Application Circuits For Instant Sound ROM IVR series of devices are designed for a wide range of applications This application note gives some examples of circuits for different applications Playback Using Piezo Buzzer Figure 10 Direct Drive Buzzer Each IVR offers a pair of buzzer driving pins VOUT1 and VOUT 2 which directly drive a piezo buzzer Since a buzzer is a voltage drive
7. ISSI Integrated Silicon Solution Inc Application Note VP01 INTRODUCTION to ISSI s INSTANT VOICE ROM PRODUCTS DECEMBER 1997 Application Note VP01 Instant Voice ROM Products ISSI Section I EnttOdUe d Osos eeu Ev tale baa ot eR ches marae 53 Section M Features uice ree types terere ve ERR 55 Section III IVR Development Tools eene 58 Section IV 1522 011 020 Selectable 64 Section V Multiple Segment Programming esses 68 Section VI IVR Applications aui e eds 71 Section VII PC Board Layout ssessesesseseeeeeee nennen enne eene 75 2 Integrated Silicon Solution Inc VP005 1E 12 10 97 Application Note VP01 Instant Voice ROM Products ISSI Section Introduction to ISSI s Instant Voice ROM INTRODUCTION Instant Voice ROMs IVRs are specialty devices for storing and playing sound IVRs utilize SST s EPROM technology together with sound synthesis and D A technology to make instant sound storing and playing possible The 1551 products contain an EPROM ADPCM sound decoder and an A D circuit Users first prepare an 8 bit PCM sound file and then use the SS7 IVR development system to do the ADPCM encoding The encoded data is programmed into a IVR device by using our IVR writer The sound is ready to be played back from the IVR through
8. a PC They need only a 15V DC power supply and copy sound data from a programmed master IVR chip to blank IVR chips Users can make a master IVR from the PC based programmers The 1 to 8 copier IS22V P005 can copy data from the master to a maximum of eight blank chips simultaneously and is a low cost system for programming DIP packaged IVRs Mass production can be done by using this copier board to program up to eight blank chips at a time and more copiers can be employed for larger volumes A 1 to 1 IVR copier is available on special order and is designed to program only one chip at a time This is suitable for COB chip on board assembly programming As each chip is bonded to the PC board it can be programmed prior to encapsulation Figure 3 shows a flow for programming IVR chips during COB manufacturing Integrated Silicon Solution Inc 11 VP005 1E 12 10 97 Application Note VP01 Instant Voice ROM Products ISSI Blank IVR Die Attach and Bonding 1 to 1 Encapsulation Final Test Finished COB Figure 3 COB Programming Flow Using an SS7 IVR Copier COB is a low cost packaging alternative for low end products IVR users can order blank die and have a COB bonding house do the packaging and test As in Figure 3 the blank IVR is attached to the substrate and bonded to a custom made PCB A test jig with a cable connection to the IVR copier socket is used to transfer encoded sound data from the master to the die
9. e voice content of the chip sequentially or one time play all 24 Integrated Silicon Solution Inc VP005 1E 12 10 97 Application Note VPO01 Instant Voice ROM Products Single Chip Demo Board ISSI 4661 LH91HAdOJ Integrated Silicon Solution Inc VP005 1E 12 10 97 Q gt a ri O m n o x ul a a 2 Land Note Not drawn to scale 25 Application Note VP01 Instant Voice ROM Products ISSI NOTICE Integrated Silicon Solution Inc reserves the right to make changes to the products contained in this publication in order to improve design performance or reliability Integrated Silicon Solution Inc assumes no responsibility for the use of any circuits described herein conveys no license under any patent or other right and makes no representation that the circuits are free of patent infringement Charts and schedules contained herein reflect representative operating parameters and may vary depending upon a user s specific application While the information in this publication has been carefully checked Integrated Silicon Solution Inc shall not be liable for any damages arising as a result of any error or omission Integrated Silicon Solution Inc does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effective
10. ir own factory SSI has available all the tools needed to support either one piece programming or mass production programming so there is no MOQ require ment IVRs Compared to Single Chip Record and Playback Sound Asingle chip record and playback sound IC consists of a built in microphone amplifier filters A D D A and a power amplifier to drive a speaker EEPROM or SRAM is the normally memory for sound data storage with some being on chip memory and some external memory To record sound the chips must include many analog circuits e g A D filter and microphone preamplifier as well as memory Cost is high for such integration Of course if youreally want a single chip to do sound record and playback you have to choose this high priced part However in many applications users only want to record into the chip once and never want it to be changed For such applications choosing record and playback chips still requires the user to pay for those unused analog circuits With IVR and our Stand alone Record And Playback Programmer no computer is required The user can record sound similarly to a single chip record and playback sound chip using a small writer board one of the ZSST s VR support tools To program the IVR you just record sound in the writer board using a microphone then simply press a button and the sound you recorded will be programmed into the IVR Once programmed the data can never be lost or overwritten 4 In
11. ise a smooth current ramp down circuit is used by the IVR Instead of suddenly dropping the current will gradually decrease to zero Options Setting All options are set during ADPCM coding which is done with the PC based voice programming system software The ACODING command is accessed by pressing the letter A After entering the number of sound phrases and the name of the file to be encoded the software will ask you to select options by answering yes or no The option data will be merged with sound data to form a data file which is ready for IVR programming After each ADPCM encoding a file with LOG extension will be created and it contains all the information including the sound file name for each phrase and the option setting information Integrated Silicon Solution Inc 17 VP005 1E 12 10 97 Application Note VP01 Instant Voice ROM Products ISSI Section V Multiple Phrase Programming For the 1522 011 020 As indicated in the product specifications SS7 IVRs can be programmed into multiple sound phrases Up to eight phrases can be programmed into a single IS22C011 020 device The time duration of each phrase is not fixed but the total time must not exceed the total time the chip can support 1 e eight seconds for 8 KHz sampling Multiple Phrase Encoding Separate sound files for each phrase in VOC format should be prepared The sound files are merged together with option information during ADPCM encoding
12. n device VCC should be at least 4 5V for acceptable loudness Buzzers used should be the double sided sound grade Piezo Speaker types Buzzers are normally not suitable for melody sounds Integrated Silicon Solution Inc 21 VP005 1E 12 10 97 Application Note VP01 Instant Voice ROM Products ISSI The advantage of using a buzzer is that the thickness of the playback module can be extremely small and hence is suitable for greeting card type applications Also buzzers require very little power usually only a very few milliamps typically 20 mA A Coin Cell battery is usually powerful enough for most applications The only drawback is the relatively low sound volume from a buzzer when compared to a speaker However optimum buzzer mounting and casing can increase sound volume Playback With Single Transistor The COUT audio pin is specially designed for driving speakers through an NPN transistor The output current is biased for 3V applications Figure 11 shows the circuit for a single transistor output Figure 11 Single Transistor Playback 22 Integrated Silicon Solution Inc VP005 1E 12 10 97 Application Note VP01 Instant Voice ROM Products ISSI For supply voltages larger than 3 0V an additional base resistor RB should be added to the base ofthe transistor RB should be from 190 to 470 Ohms depending on the Vcc value and the sound volume required VCC gt 3 0V Figure 12 Single Transistor Pla
13. ness Products are not authorized for use in such applications unless Integrated Silicon Solution Inc receives written assurances to its satisfaction that a the risk of injury or damage has been minimized b the user assumes all such risks and c potential liability of Integrated Silicon Solution Inc is adequately protected under the circumstances Copyright 1997 Integrated Silicon Solution Inc Reproduction in whole or in part without the prior written consent of Integrated Silicon Solution Inc is prohibited Headquarters U S Office ISSI Sales Offices China Office Shenzhen Northeast U S Office Southeast U S Office 2231 Lawson Lane S F 24 Bldg Ke Yuan Rd 11 North Eastern Blvd 6200 Falls of Neuse Road Santa Clara CA 95054 Science amp Industry Park Suite 310 Suite 200 800 379 4774 Tel Nan Shan District Nashua NH 03062 Raliegh NC 27609 408 588 0806 Fax Shenzhen 518057 China 603 594 4176 Tel 919 871 9990 Tel 0755 6633977 Tel 603 594 4181 Fax 919 871 9991 Fax Taiwan Office 0755 6633984 Fax 106 Sec 1 Shin Tai Wu Rd Northcentral U S Office Southcentral U S Office Hsi Chih Taipei Hsien Hong Kong Office 1807 Hicks Road 2695 Villa Creek Taiwan R O C Room 301A 3 F Suite C Suite 275 8862 696 2140 Tel 113 Argyle Street Rolling Meadows IL 60008 Dallas TX 75234 8862 696 2252 Fax Mongkok 847 776 1670 Tel 972 488 9691 Tel Kowloon Hong Kong 847 776 1655 Fax 972 488 9690 Fax China Office
14. ng another HIGH signal applied on any trigger pin will not trigger the chip until the play is completed Figure 4 shows the pulsed trigger a cL i f Phraset f__Phraset NJ 1 Audio Out Phrase 1 Phrase 1 Phrase 1 Figure 4 Pulsed Trigger In the level sensitive trigger mode the IS22C011 020 will play only if a HIGH signal is kept at the trigger pin Once the HIGH signal is removed playback stops immediately See Figure 5 14 Integrated Silicon Solution Inc VP005 1E 12 10 97 Application Note VP01 Instant Voice ROM Products ISSI s Lo L i Phrase f Phrase Phrase 1_ Audio Out Phrase 1 Phrase 1 Phrase 1 Figure 5 Level Sensitive Trigger In both trigger modes if the HIGH signal is longer than the playing phrase the phrase will repeat playing again Stop or Busy Signal IS22C011 020 provides a status signal on the STP BUSY pin When the STOP option is selected the STP BUSY will output a HIGH pulse at the end of audio playback The pulse width is approximately 30 ms If the BUSY option is selected the pin will output a HIGH signal during audio playback Figure 6 shows the difference Stop Option Busy Option Audio Out STP BUSY L Figure 6 Stop or Busy Option Non Sequential or Sequential Playall If the IS22C011 020 is programmed with more than one sound phrase the SBT trigger pin can be programmed in non sequential or sequential play all modes For non sequen
15. power supply is the only requirement for these programmers To facilitate user mass programming an IVR copier is used to copy data from a programmed master IVR to as many as eight blank IVRs Integrated Silicon Solution Inc 5 VP005 1E 12 10 97 Application Note VP01 Instant Voice ROM Products ISSI ISSI offers a stand alone record and playback IVR programmer board with a built in microphone and preamplifier The sound is first recorded into an on board SRAM After listening to and approving the recorded sound the board does the ADPCM encoding and programs the data into a blank IVR Therefore the user can record and program the IVR without using a PC Flexible Phrases Each IVR has a fixed memory size and the memory can be divided into as many as eight separate phrases The length of each phrase is user programmable and the only restriction is that the total length of all phrases shall not exceed the maximum capacity of the IVR The capacity of each IVR depends not only on the memory size but also on the sampling rate used to record the sound For example the IS22C011 has 256K bits of memory If the sampling rate is 8000 Hz the maximum length is eight seconds If the sampling rate is 6000 Hz the maximum length is ten seconds Stable Built in Oscillator The sampling rate of each IVR is set by a very stable built in oscillator controlled by an external resistor For the IS22C011 a 2 MQ resistor will set the sampling frequency
16. programmer board can record playback and program IVR chips without requiring a PC Sound can be directed to the on board microphone recorded into on board SRAM and played back through the on board speaker If the sound is acceptable a blank IVR is programmed with the sound stored in the on board SRAM This programmer demonstrates the OTP instant recording capability of the IVR With this writer a user can program IVRs similarly to single chip record and playback ICs This concept is particular useful in the personalized greeting cards gifts and similar markets Since most applications have different requirements our application engineers can work with customers to develop custom programs Integrated Silicon Solution Inc 13 VP005 1E 12 10 97 Application Note VP01 Instant Voice ROM Products 155 Section IV Selectable 1S22C011 020 Options This application note explains in detail the several user programmable IS22C011 020 options Option information is stored in the on chip memory together with the sound data These options are selected and programmed by users during the normal ADPCM coding Pulsed or Level Sensitive Triggers There are two kinds of triggering methods for the IS22C011 020 When using a pulsed trigger a HIGH signal i e voltage equals VCC applied to a trigger pin longer than the debounce time about 30 ms the chip plays back the whole phrase I822C011 020 is not re triggerable so when the chip is playi
17. t easy to drive a speaker with as little interface circuitry as a simple low cost NPN transistor No complex filtering or amplifier circuit is necessary Adding a filter and power amplifier to this output gives a higher quality playback sound PWM Voltage Output To extend the range of applications a pair of PWM output pins VOUTI and VOUT2 will directly drive a speed grade buzzer Sound quality is comparable to a speaker but the power consumption is much lower With a buzzer as the output the user can make a very thin sound module with very low power consumption Integrated Silicon Solution Inc 7 VP005 1E 12 10 97 Application Note VP01 Instant Voice ROM Products ISSI Section 111 Development Tools For Instant Voice ROM ISSI provides a series of support tools to program or playback sound from the IVR This section will help the user decide which tool is most suitable for each particular situation The following IVR development tools are available IS22VP001 Playback demonstration board IS22VP002 Stand alone record and playback board IS22VP003 PC based 1 piece ISA slot add in programmer IS22VP004 PC based 20 piece ISA slot add in programmer IS22VP005 1 to 8 copier board IS22VP006 PC based 1 piece printer port programmer IS22VP003 IS22VP004 and IS22VP006 PC Based Programmers IS22VP003 IS22VP004 and IS22VP006 PC based sound recording and editing systems These systems are usually used when high quality so
18. tegrated Silicon Solution Inc VP005 1E 12 10 97 Application Note VP01 Instant Voice ROM Products ISSI Section Il Features of the Instant Voice ROM IVR Very Good Sound Quality ISST s proprietary ADPCM algorithm is used for sound data encoding and compression Each 8 bit PCM file is compressed into 4 bit data to be stored It is decoded back to 8 bit sound data by the IVR during playback The sound quality therefore is much better than the 4 or 5 bit PCM which is used in most sound products today User Friendly Development Tools The IVR is most often programmed by the user so SS provides a full set of development tools We have both Personal Computer PC based and stand alone types of develop ment systems The PC based sound editing system is the most complete development system for JSST IVRs It consists of a user supplied sound system a PC compatible sound card and the ISSI IVR programmer board There are two types of programmer boards One is a single piece writer which can program one device at a time This programmer is suitable for sample or master making Another is a multiple programmer board which can program up to 20 pieces and is designed for small quantity programming System software is provided for device programming Please refer to the PC Based Programming System 1522 003 004 006 User s Manual for details There are several types of stand alone programmer boards and each work without a PC A DC
19. tial play all the SBT pin will trigger the chip to play all phrases in order For sequential play all the chip will play each phrase one by one whenever the SBT pin is triggered After all phrases are played once the chip will play the first phrase again and the cycle repeats Figures 7 and 8 show these options together with the pulsed and level sensitive option Integrated Silicon Solution Inc 15 VP005 1E 12 10 97 Application Note VP01 Instant Voice ROM Products ISST ee eT ae Audio Out ___ZPhrase Phrase 2X Ease NN Phrase 1X X Prrase NX Phrase TC a One shot trigger SBT l LI L_ Audio Out ZPhrase 1 X Phrase 2 ZPhrase 1 Phrase NX Phrase 1X b Level hold trigger Figure 7 Non Sequential Playall Sar des ee p dii Audio Out Pise TN Prrase Phrase 2X Pese 2N a One shot trigger Audio Out Phrase 2 2 b Level hold trigger Figure 8 Sequential Play 16 Integrated Silicon Solution Inc VP005 1E 12 10 97 Application Note VP01 Instant Voice ROM Products ISSI Ramp Up and Ramp Down Options The Ramp Up Down option affects only the speaker drive output COUT pin and will not affect the PWM buzzer driving VOUT1 and VOUT2 pins Since each IVR chip will automatically power down after playback current output from COUT will drop from a certain value to zero If the current drops suddenly a pop sound will be heard through the speaker To reduce this pop no
20. und is required and the sound source is a cassette tape CD or DAT tape The IS22VP003 and IS22VP004 programmers consist of a PC add in card and a writer board The IS22VP003 programs one DIP packaged IVR chip each program cycle and it is suitable for making a master sample The IS22VP004 can program from one up to amaximum of 20 DIP packaged chips at the same time and is suitable for in house small volume production Cost is another consideration The IS22VP003 is less expensive than the IS22VP004 Other ISSI programmers are available for mass production The IS22V P006 interfaces with the PC through the printer port and the keyboard socket and performs like other programmers 8 Integrated Silicon Solution Inc VP005 1E 12 10 97 Application Note VP01 Instant Voice ROM Products ISSI To use any of the programmers the user should install a sound system with equipment suitable to playback the sound source A preamplifier and equalizer are recommended for better sound quality In order to record the sound into the computer a sound card must be installed Testing has shown that the Creative Lab Sound Blaster card 8 or 16 bits is compatible with our hardware and software Finally either the IS22VP003 IS22VP004 card should be installed in the computer or the IS22VP006 connected to the appropriate port For detailed installation information please refer to the PC Based Programming System User s Manual for details Figure 1 sho
21. ws the hardware configuration of a PC based editing and programming system 286 386 486 T l Computer oe NH NON NON O 099200 Writer Figure 1 PC Based Editing and Programming System The sound is recorded by the sound card and becomes a file stored in the computer After editing the sound the user can call up the SS7 IVR sound compression software for ADPCM coding and compression Programmable features of the IVR most suitable for each application are selected at this time The ADPCM coding program produces an encoded sound file containing sound and option information This file can then be programmed into the IVR Either the IS22VP003 IS22V P004 or IS22V P006 program mer can be used to program the chip Integrated Silicon Solution Inc 9 VP005 1E 12 10 97 Application Note VP01 3 Instant Voice ROM Products ISSI Figure 2 is the production flow using the IS22VP003 IS22VP004 and IS22VP006 programmers Cassette Tape DAT CD Voice Recording and Editing Accept Quality Option Select and ADPCM Coding Programming Using IS22VP003 004 006 Programmed IVR Figure 2 PC Based Production Flow 10 Integrated Silicon Solution Inc VP005 1E 12 10 97 Application Note VP01 Instant Voice ROM Products ISSI IVR Copiers IVR copiers are single board IVR programmers which work without
22. yback Circuit for VCC gt 3 0V Figure 13 shows the circuitry for applications that require immediate Stop Play of current section triggered allowing Start Play of next section triggered This circuitry can only be applied to S1 through S4 and must be applied to each pin individually Figure 13 Stop Start Triggering Circuit Integrated Silicon Solution Inc 23 VP005 1E 12 10 97 Application Note VP01 Instant Voice ROM Products ISSI Section VII Example PC Board Layout This example PC board demonstrates how to playback with ISSI s voice chips It supports three different modes of playback Buzzer Transistor and Power Amplifier To hear playback through a buzzer simply plug a double side buzzer into the JP2 output port To hear playback through a transistor the JP4 jumper should be plugged to the TX side and an 8Ohm speaker should be connected to the JP1 jack To hear playback through an operation amplifier the JP4 jumper should be plugged to the AMP side and an 8Ohm speaker should be connected to the JP5 jack A 4 5V DC power should be connected to JP3 Make sure the polarity is correct Select the correct sampling rate by turning the VR1 This PC board can support the sampling frequency from around 5 KHz to 15 KHz VR2 is the volume control when the board is set to the amplifier playback mode S1 to S4 can be used to trigger the playback of voice sections 1 to 4 respectively The SBT can be used to playback all th
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