Schematic FILE W:O February 27, 1994ADV94091A01&1k2 & 4k8 Bd Combi Modem for OptoPcScccSccORIGINAL DESIGN BY VE3DNLTHIS VERSION BY PE1ICQ bTRXP! t= r t= J t= &lyt= U1DTL074X t= 0 t=  a t= * t= T t= ,! t= #,P!*t= C147n$rP!Ft= R1100k&rxyt= U1CTL074#!Ft= R856k#r!Ft= R210kM@*t= C51n10%%Ft= R51100E$,!Ft= R5560EMJ@*t= C31n10%MTJ@*t= C41n10%$|^!Ft= R3330k&r€yt= U1BTL074#!Ft= R956kM0@*t= C61n10%#v!Ft= R647k#XFt= R739k$!Ft= R1156k$!Ft= R1056kM*@*t= C81n10%&fyt= U1ATL074$p!Ft= R1215k% !Ft= R13100k` t=Q t=Q` t=Q t=Q| t=Q t=QV t=Q'dt=QU3A74LS00#Z!Ft= R521k$Z<AFt=QR242k2$ZFt=QR283k3&" :t=QU2ALM339& :t=QU2DLM339$TFt=QR2115E$Ft=QR2015E%!Ft=*OR31270k%b!Ft=)OR29100k$*t='OC2150n#!Ft=%OR44k7 t=1O: t=2O t=3O t=4O$*t=0OC1347n$Ft=/OR5739k$Ft=.OR5810k&yt=U4DTL074>: t=\: t=$>Ft=R5947k$\Ft=R3210k$!Ft=R4547k%!Ft=R46470k t=| t= t=Hp t=$ t=%*z t=JMP1JUMPER 3$!Ft=(R423k3$H!*t='C204n7$ H!Ft=!R4147k$H!Ft= R4047kNf@*t=C171n10%P !@*t="C19680p10%$:pFt=R3747k$:Ft=R3639k$R!Ft=R3847k$R!Ft=R3547kNp@*t=C151n10%N !@*t=C161n10%&JRyt=U4BTL074: t=*%|Ft=R34100k$J!Ft=R3315k%z*t=C18100n%Ft=R39100E(lCt=NU5C74HC132$f!rt=NC2422u%!Ft=NR50100E@ t=N t=Nh t=N t=N$rt=NC2110uP!@t=ND4BZX79C33# !Ft=NR441M(t=NU5D74HC132(t=NU5A74HC132l t=O t=O$Ft=OR4710k*zv,! t=['JMP2JUMPER 24 t= %!Ft= R56470E$,t=OP1DB9F$*t=QC1147n$*t= C1047n%8Z!Ft= R14100k%8!Ft=QR17100k%`Ft=QR16220k%`xAFt= R15220k&3 :t=QU2CLM339&Z :t=QU2BLM339$d!Ft=QR263k3$!Ft=QR273k3$(AFt=QR232k2$(<AFt=QR252k2't=QU3B74LS00'nĀt=QU3D74LS00'3 Àt=QU3C74LS00M>Z !@*t= C91n 10%ODZ !@*t= C7680p 10%&0Àyt=+OU4CTL074N!@*t=,OC141n10%#h!Ft=-OR301M&XHyt=U4ATL074  t=e-xF t=f-xF t=p-xF t=q-xF t=r-xF t=s-xVF t=t-xF t=u-x t=v-xf t=z-x t={-x$l<rt=x-xC4010u$fxrt=y-xC4110u$( rt=o-xC383u3$V(rt=n-xC393u3$(rt=l-xC363u3$(rt=m-xC373u3&P0_?k-xU8LM7805&P0_?j-xU9LM7810&2f7 _?|-xP3DJ-005$*t=-xC2510n$@*t=-xC2610n$*t=~-xC3110n$:*t=-xC3210n%Z*t=-xC42100n%*t=-xC43100n t=-xZ t=-x: t=-x t=-x t=-x t=-x@ t=-x t=-x$*t=}-xC3010n$*t=-xC2710n&D!t=OD51N4148&t=&OD11N4148#h*t=NC221n&lt=NQ12N70000 t=K&:A _t=NP25P DIN%Nv!Ft=NR53100E$ !Ft=NR431k5%0 Ft=JR60100k& t=ND61N4148. _?w-xU10 MAXIM ICL7660%Ft=OR48470E$0aMd_?FD11LED$Ft= R552k2$!Ft=QR1910k$6!Ft=QR2210k&t=QD31N4148&Zt= D21N4148$"!*t=QC124n7  PM >FM RXD RTS TXD p+10V -10V 22VCC d2VCC v4+10V VCC VCC <lVCC VCC 2VCC rVCC \+10V Z-10V D-10V -10V -10V +10V J+10V +10V dVCC VCC p-10V h+10V VCC v-10V @+10V -10V VCCTZdd$djd2nd:4Tb2T$jd\`,6d6@^hh*`  H*f  \ :rXXb:H ` Hj<j   **<RRPP\\D\f6fDpdTTZ"Z@ZTZd:dXddd4dRddddd$d`djd(n2nTh0:Th*4Thbl(2$`jh|H\"T,,,`,^6666Z6d6@@@@^hrhhhrr r*r^hD*`  ^hHZd  Hp *fpfr   \ :t:XrXbJbbbtvv&:4H\  `  4Hz4H<j    D  **R**44j44<n<RRRR4R>RRRRRPPnP|\\\\:\D\f6fff|pp6@rDR(\(v22FFvZZRdpdZD*f6f6TZTTT^6^@^^^h^^JbJ||rXrrrp"6^h\fXvddd*\Xb::::::DDDDDD\DDbbv4v>vzvrfdR\zJJdvR*r*44HHH0H:HHR*R4RfRp\\fff0f:pp 4RdDDd*vPvZ0:$d$x$$$$$$F`,`jdjnjjjjt:tvx:b@Jpdpnpp<<Zd2d2n22dddd"d6Prr  <F<P <F P<PP` ``<`FTTTT <F\\ #VFt=QR181k* t=&JMP3JUMPER 3(t=)U5B74HC132$Jt= RV110k%l.t=OQ2BC548$H>t=#RV34k7$:-t=(ORV247kTZhZdd$d.djdd2ndn:b4\2d$.j\f`,,66@@*prXX:DHH\ P **RRRR\\\\D\N\6f@fpddfpTT^h^6@hD\Dfbb**HHHHff*R``jj <<ddd6d 2  TTXXj j dd 4,Q<@rt=g-xC351000u25V# *t=/C441n#d *t=0C451n t=3x2< <<< % !2V_?a-xD7SB130% Z,!2V_?d-xD9SB130&FZ,!2V_?c-xD10SB130%F!2V_?b-xD8SB130P n n nnPnZnxnd t=4nP  n<<nPP<Z   < VCC<$ Ft=5R5410k%2vFt= R61470E#d*t=2C461n#dd*t=1C471nn2nPP << *#Ft=K R621K\ \(DDlll(Bt=$U?TCM3105N)gL$U?A74HCT132)gL$U?A74HCT132)VgL$U?A74HCT132..LLLjjjZZZ$Z8Z`ZZ$2aMd_?GD12LED%Ft=OR49470E4DCD-4K8::::: :`DCD:#h_?$Q?PNP( t=$!P!Ft=$R?R t=$Zx2F22 VCC T To OptoPcScc ^ Port 4k8  To OptoPcScc Port 1k2$,t=$P?DB9F!!Ft=$R?R DCDZZ`jjjZ`ZtZZ'._?$X?CRYSTAL$$%Vt=$R?R VAR!B!Ft=$R?R!t!Ft=$R?Rzta t=$ LVCCLL~~j$jGNDGNDGND324GNDGNDGNDGNDGNDGNDCR324RRCRRCCR324RCRRRRC324RRGNDGNDGNDGNDGNDGNDGND74LS00RRRLM339LM339RRRRCRGNDGNDGNDGNDCRR324GNDGNDRRRRGNDGNDGNDGNDGNDJUMPER 3RCRRCCRRRRCC324GNDRRCR74HC132ELCORGNDGNDGNDGNDTANT DIODE ZENERR74HC13274HC132GNDGNDRJUMPER 2GNDR CONNECTOR DB9CCRRRRLM339LM339RRRR74LS0074LS0074LS00CC324CR324GNDGNDGNDGNDGNDGNDGNDGNDGNDGNDGNDTANTTANTTANTTANTTANTTANTLM7805LM7805 PHONEJACKCCCCCCGNDGNDGNDGNDGNDGNDGNDGNDCCDIODEDIODECMOSFET NGNDHEADER 5RRRDIODE7660RLEDRRRDIODEDIODECRJUMPER 374HC132R VARNPNR VARR VARELCOCCGNDDIODE SCHOTTKYDIODE SCHOTTKYDIODE SCHOTTKYDIODE SCHOTTKYGNDRRCCRTCM3105N74HCT13274HCT13274HCT132LEDRPNPGNDRGND CONNECTOR DB9RCRYSTALR VARRRGND