OP77GP

OP77 AD | Alldatasheet

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| ANALOG Next Generation OPO7, FEATURES superior performance in high closed-loop-gain applications. * Outstanding Gain Linearity Low initial V,. drift and rapid stabilization time, combined with © Ultra High Gai... scsseessessneesneesseesseessneeess 5000V/MV Min, only 50mW power consumption, are significant improvements © Low Vo, Over Temperature ...csssssseseeserersseresrees GOV Max over previous designs. These characteristics, plus the excep- ce een, Pon SOBA: 741 Sockets PSRR of 3nV/V (11008) and CMAR of 1.0uV/V maximum virtu- vailable in Die Form ally eliminiate errors caused by power supply drifts and com- mon-mode signals. This combination of outstanding character- ORDERING INFORMATION ' istics makes the OP-77 ideally suited for high-resolution instru- PACKAGE mentation and other tight error budget systems. Te OPERATING CERDIP PLASTIC Lec TEMPERATURE Continued T0299 &-PIN PIN 20-PIN RANGE ———Ss— :_T TT PIN CONNECTIONS OP77As" OP7/AZ* - - MIL OP77EJ —OP77EZ IND - - OP77E° - com Vos TRIM [7] [=] vos Rm OP77BJ" —OP77BZ* — _OP778RCI883 iL wet ve 2 Vos TRIM OP77FJ—OPT7FZ - - IND an oF er Vos TRIM ave - - OP77FP - com _| - - 0P77GP - com “ey Pine “ne our - - es" - ‘ 7 7 opune > Sino EPOXY MINI-DIP (P-Suffix) - - OP77HSt" - XIND 8-PIN HERMETIC DIP a3 NC. eee (Z-Suffix) 2 V- (case) * Fordevices processed in total compliance to MIL-SDT-883, add /883 after part number. Consult factory for 883 data sheet. + Burn-in is available on commercial and incustrial temperature range parts in foun TO-99 (J-Suffix) CerDIP, plastic DIP, and TO-can packages. (S-Suffix) tt For availability and burn-in information on SO and PLCC packages, contact g8esy your local sales office. STEEN ne. [a] [ie] nc. GENERAL DESCRIPTION =n [5] [2] v+ OP-77BRC/883 ; ; no. [] [i] nc. Loc The OP-77 significantly advances the state-of-the-art in preci- an [7] [is] our (RC-Sutfix) sion op amps. The OP-77's outstanding gain of 10,000,000 or ne fe] fe] nc. more is maintained over the full + 10V output range. This excep- ject calc tional gain-linearity eliminates incorrectable system nonlineari- giggs ties common in previous monolithic op amps, and provides SIMPLIFIED SCHEMATIC ve oe rae O WOR on ® ® fr snore: 1 8 2A AND R23 ARE ma ate DIUSTED ON ChiP 2° AP racron Pe oy Le? Os) LHe 2H "uy INVERTING © SZ inrur 5 ce JE 7 2m wou Kor] 9 og] oft -1-

This product is available in six standard grades and five stan- OP-77E, OP-77F, OP-77G (P, S) ----esssrsercsererseeeses OPC to 70° dard packages: the TO-99 can, the 8-pin mini-DIP in ceramic, OP-77H (P, S) csssssssssecsesssseeessrssssneesesssseeeeesss “40°C to +85°C SO or epoxy, and the 20-contact LCC. Junction Temperature (T)) sosersseesnsesessneesssnasens O5°C to +1506 725, or 108A op amps. 741-types can be replaced by eliminat- PACKAGE TYPE 4 (Note 3) ec UNITS ing the V,,, adjust pot. For higher precision performance referto | OP-177. TO-99 (J) 150 18 sow &-Pin Hermetic DIP (2) 148 16 <cw ABSOLUTE MAXIMUM RATINGS (Note 2) SPatermete De) AB __“" Supply Voltage 422 8-Pin Plastic DIP (P) 103, 43 “cw Input Voltage (Note 1) ..cssssscsssseseensssessseussseessusnsssesnenses £22V 8-Pin 80(8) 188 42 scl Storage Temperature Range 1. For supply voltages less than +22V, the absolute maximum input voltage is zy 0 ‘equal to the supply voltage. J, Z, and RC Packages w.srerssnssrnmsenen “65°C 10 +150°C 2. Absolute maximum ratings apply to both DICE and packaged parts, unless Operating Temperature Range 3. @,, is specitied for worst case mounting conditions, i.e., @,, is specified for OP-77A, OP-77B (J, Z, RC) srasonssenennrn “55°C 10 4125°C device in socket for TO, CerDIP, P-DIP, and LCC packages; @;, is specified OP-77E, OPP-77F (J, Z) ~25°C to +85°C for device soldered to printed circuit board for SO package. ELECTRICAL CHARACTERISTICS at V, =+15V, T, = +25°C, unless otherwise noted. OP-77A OP-77B PARAMETER SYMBOL _ CONDITIONS MIN TYP MAX MIN TYP MAX _UNITS Input Offset Voltage Vos - 10 25 - 2 60 HV Long-Term input Offset Voltage Stability AVog/Time (Note 1) - 02 - - 02 = pVMe Input Offset Current los = 03 15 - 08 28 nA Input Bias Current lp 02 12 20 ~02 12 28 nA Input Noise Voltage np, 0.1Hz to 10Hz (Note 2) = 035 +06 = 035 06 app Pe f= 10Hz (Note 2) = 103 180 = 103 180 Input Noise Voltage Density e, fq = 100Hz (Note 2) - 100 13.0 - 100 130 WH fg = 1000Hz (Note 2) - 96 11.0 - 96 10 Input Noise Current i 0.1Hz to 10Hz (Note 2) = 14 30 = 4 «30 pAa-P EEE fg = 10Hz (Note 2) = 032 080 - 032 0.80 Input Noise Current Density i, {9 = 100Hz (Note 2) ~ 014 0.23 - 014 0.23 paHe fo = 1000Hz (Note 2) - O12 017 - 0.12 047 tee Ry (Note 3) 260245 - 185 45 - Ma Input Resistance ~ ‘Common-Mode Rincm - 200 - - 200 - ca Input Voltage Range vA #13 214 = 413 #14 - v ‘Common-Mode Rejection Ratio cMAR Vey= #13V = on 1.0 = 0110 pw Power Supply Rejection Ratio PSAR V, = 40V 10218V = 07 3 = 07 3 nV Large-Signal Voltage Gain Avo R,22k0, VO =£10V 5000 12000 - 2000 8000 - vimv RL = 10K 413.5 414.0 - #135 +£14.0 - Output Voltage Swing Vo RL 22ka 4125 413.0 - #125 £13.0 - v RL = tka #120 212.5 - 20 £125 ~ Slew Rate SR Ry 2 2k0 (Note 2) O41 03 - 0.4 03 = Vins Closed-Loop Bandwidth BW Ayeu = +1 (Note 2) 04 08 = 04 06 = Miz Open-Loop Output Resistance Ro - 60 - - 60 - a

5 Vi = 215V, No Load = 50 60 a rT)

Power Consumption P, v5 2:3V, No Load - 35 45 - 35 45 mw Offset Adjustment Range Ri, = 20k0 a) ~ = #8 = mv NOTES: Excluding the initial hour of operation, changes in Vo, during the first 30 oper- 1. Long-Term Input Ofiset Voltage Stability refers to the averaged trend line of ating days are typically 2.5nV. Vog ¥8 Time over extended periods alter the first30 days of operation. 2. Sample tested. 3. Guaranteed by design. -2-

ELECTRICAL CHARACTERISTICS at Vs = + 15V, -55°C = Ta = + 125°C, unless otherwise noted. OP-77A OP-77B PARAMETER ‘SYMBOL CONDITIONS MIN TYP) MAX MIN TYP MAX UNITS Input Offset Voltage Vos 7 - 8 60 - 4 120 Ww Average Input Offset 7 ‘Note 1 - On 03 - B °¢ Voltage Britt Cys ( Note ) 7 02 06 wee Input Offset Current los _— 0.5 22 _— Os 45 nA Average Input Offset Current Clog (wote 2) isos is 50 parc Drift io Input Bias Current Ig 02 24 4 -02 24 6 nA Average input Bias Current sly (note 2) 6g 8s 5s owe Input Voltage Range IVR 3134135 0 — 23 485 — v Common-Mode Rejection Ratio _ CMRR Vom=#13V — 0110 -— oo 3 av Power Supply Rejection Ratio PSRR Vg=+3V to =18v - 1.3 - 4 5 Ww Large-Signai Voltago Gain Avo RL 2 2k", Vo B10V 2000 6000 — 1000 4000 — vimy Output Voltage Swing Yo Rue ake 2 40 — +2 4000 — v Power Consumption Py Vs = #15V, No Load - #0 6 - 0 6 mw NOTES: 1. OP-77A: TCVog is 100% tested 2. Guaranteed by end-point limits. TYPICAL OFFSET VOLTAGE TEST CIRCUIT TYPICAL LOW-FREQUENCY NOISE TEST CIRCUIT 25mo 200K [ | ve ww [| ww 2 U ° amo, an courrur [| ove = (tole FILTER} = InPUT REFERRED NOISE = E955 OPTIONAL OFFSET NULLING CIRCUIT BURN-IN CIRCUIT 100402 nav 20482 F ove ~ Eine Ba 1092 - ah je 3 1e eur © ourrur ou

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ELECTRICAL CHARACTERISTICS at Vs = + 15V, Ta = 25°C, unless otherwise noted. OP-77E OP-77F OP-77G/H PARAMETER SYMBOL __ CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX —_UNITS Input Offset Voltage Vos - 0 2% - 2» © — 50 100 wv Long-Term Vos _ _ one _ _ ‘Stouity Vos/Time (Note 1) 03 o. Od HV/Mo Input Offset Current log — 03 18 — 03 28 — 08 28 nA Input Bias Current Ig -02 12 20 -02 12 28 02 12 28 nA , O.1H2 to 10Hz Input Noise Voltage enp-p tNote2) — 035 06 — 038 0.65 — 038 0.65 pp Input Noise to= 10Hz — 3 180 — ws 200 — 105 200 voltage Densit, en fo = 100Hz (Note 2) — 10.0 73.0 — 02 135 — 102 135 nVA/He in Y to = 1000Hz — 96 110 — 98 115 — 98 15 O.1H2 to 10Hz Input Noise Current iap.p tNote2) — 4 9% - 6 3 -— 6 3 App input N to= 10H2 — 032 0.80 — 035 0.90 — 035 0.90 Darront Densit In to = 100Hz (Note 2) — 014 023 — 018 a2 — 015 027 pare Y f= 1000Hz — 012 07 = 073 018 — 013 048 Input Resistance — 6 = 1 - 1! 4 - Differential-Mode PN (Note 3) 26 5 8.5 45 8.5 5 Mo Input Resistance — - - — 2 - - = Common Mode RINcs 7 200 100 200 en Input Voltage Range _ IVR +9024 — ee eee 413 am v Common-Mode =+ — of 10 - of 16 — or 16 VV Rejection Ratio OMAR Vom==18V ” Power Supply oe 1 — 07 30 ~ 07 30 ~~ 07 30 vv Rejection Ratio PSR Vs=3V 0:4 18V ° “ Large-Signal RL 2 2k0, a voltage Geir Ayo Vee ciov 5000 12000 2000 6000 2000 6000 wmv RL> 1000 4135 +400 — 4135 41400 — 4135 2140 °° — output voltage Vo ee +125 +30 ° — +125 +1000 — +125 +1300 ° — v wing RL>1kO. #120 412.6 0 — #120 4125 0 — #120 +125 0° = Slew Rate SR R= 2k (Note 2) e108 on 03 or 08 Vius Closed-Loop Ave= +1 _ 4 _ _ Concwiat Bw (Note?) 04 08 04 08 04 08 MHz Open-Loop Output — 6» ~ @ - ~ @ — a Resistance Vg #18V, No Load - 50 60 — 59 — 50 6 Power Consumption Pg Vg = +3V, No Load — 35 45 — 35 45 — 35 45 mw Offset Adjustment p= 20K0 - # — —~ bp -— 4 = mv Range NOTES: 1. Long-Term input Offset Voitage Stability refers to the averaged trend line of Vog v8. Time over extended periods after the first 30 days of operation. Excluding the initial hour of operation, changes in Vos during the first 30 operating days are typically 2.5uV. 2. Sample tested 3. Guaranteed by design

ELECTRICAL CHARACTERISTICS atV, = +15V, -25°C = T, = +85°C for OP-77E/FJ and OP-77E/FZ, 0°C = T, = +70°C for OP-77E/F/GP/GS, -40°C < TA < +85°C for OP-77HP/HS, unless otherwise noted. eee — OP-77E OP-77F OP-77G/H PARAMETER SYMBOL CONDITIONS MIN TYP MAX ‘MIN TYP MAX MIN TYP MAX UNITS J, Z Packages - 10 45 - 20 100 - - Input Offset Voltage — Vos, P Package - 10 55 - 20 100 - 80 150 w Average Input Offset J, Z Packages - O41 03 - 0.2 06 - - - por Voltage Drift TWCog PPackage Nt) _ gg 0.6 -~ 04 10 - o7 12 wre Input Offset Current los - Os 22 - O5 45 - os 45 nA Average Input Offset ‘Cumunt Drift Telog (Note 2) - 15 40 - 15 85 - 15 85 pAC Inpuias Curent ly EFGGades 02 24 40-02 24 G0 0B BK Og ‘Average Input Bias Current Drift TCl, (Note 2) - 8 40 - 15 60 16 60 Z parc ‘Common-Mode Rejection Ratio CMRR Vom =213V = O41 1.0 - O41 3.0 - 041 3.0 uN Power Supply . _ _ Large-Signal R= 2ka . . Voltage Gain Avo Vo ==10V 2000 6000 - 1000 4000 1000 4000 Vim oon ee Vo R= 2k #12 213.0 - 312 213.0 - Te v Power Consumption Py Vg = #15V, No Load - 60 75 - 60 75 - 60 7S mw NOTES: 1. OP-77E: TCV, «is 100% tested on J and Z packages. 2. Guaranteed by end-point limits. OPEN-LOOP GAIN LINEARITY vy TYPICAL wv OP-77 rma sons PRECISION OF ANP Avy Viy> 210 | ~) Vx ve toa Ty lov Nae “tov ow ov Vx Ans | = ait i Ayo = 850Vinv Notes: 2 Aygsree ONLY PART OF ME SOLUTION. Actual open-loop voltage gain can vary greatly at various output This is the output gain linearity trace for the new OP-77. The voltages. All automated testers use end-point testing and there- output trace is virtually horizontal at all points, assuring ex- fore only show the average gain. This causes errors in high tremely high gain accuracy. The average open-loop gainis truly closed-loop gain circuits. Since this is so difficult for manufac- impressive — approximately 10,000,000. turers to test, you should make your own evaluation. This simple test circuit makes it easy. An ideal op amp would show a hori- zontal scope trace. a

ae 1. BALANCE * eS Gor 2. INVERTING INPUT Seo (Scene! 3. NONINVERTING INPUT Usleher eM Lee 4v- eee GI A 6. OUTPUT qt el 7 V+ wecrikgly 8. BALANCE DIE SIZE 0.093 x 0.087 inch, 5301 sq. mils (2.36 x 1.45 mm, 3.42 sq. mm) WAFER TEST LIMITS at Vs = + 15V, Ta = 25°C for OP-77N/G devices. OP-77N OP-77G PARAMETER ‘SYMBOL CONDITIONS LIMIT LIMIT UNITS Input Offset Voltage Vos oO 75 AV MAX Input Offset Current _ los, - a 20 _ __ 28 nA MAX Input Bias Current lp 22 £28 nA MAX Input Resistance Differential-Mode Fin (Note 1) 26 7 Mo.MIN Input Voltage Range IVR £13 213 VMN Common-Mode Rejection Ratio cMAR Vow==18V 1 16 WV MAX Power Supply evox Rejection Ratio PSRR Vs = 3V to + 18V. 3 3 BV/V MAX Ry = 10k. +135 £135 Output Voltage Swing Vo. RL =2k0 2125 £125 VMIN RL=1ka #120 £120 Large-Signal RL=2k0 Votage Gain Avo Voc aoy 2000 1000 V/V MIN Differential Input +: Votave £30 90 VMAX Power Consumption Py Vour=0V 60 60 mW MAX NoTES: 1. Guaranteed by design. Electrical tests are performed at wafer probe to the limits shown. Due to variations in assembly methods and normal yield loss, yield after packaging is not guaranteed tor standard product dice. Consult factory to negotiate specifications based on dice lot qualification through sample lot assembly and testing, TYPICAL ELECTRICAL CHARACTERISTICS at Vs = + 15V, Ta = + 25°C, unless otherwise noted. OP-77N OP-77G PARAMETER: SYMBOL CONDITIONS TYPICAL TYPICAL UNITS: Average Input Offset _ ° Voltage Drift TCVos Rg=500 o4 02 BV/?C Nulled input Offset _ _ : Voltage brit TOVosq Rig = 500, Rp = 20k0 01 02 avec ‘Average Input Offset 05 0s Ae Current Drift TOlos a o Slew Rate SR RL=2kn 03 03 Vius Closed-Loop _ 5 Condwiath Bw Ayo =+1 06 06 MHz -6-

TYPICAL PERFORMANCE CHARACTERISTICS GAIN LINEARITY (INPUT OPEN-LOOP GAIN GPEN-LOOP GAIN vs POWER VOLTAGE vs OUTPUT ve TEMPERATURE : =) Jey 4 ePIC pple poop PPPS they] Coe #8 SJ anne ; Y -

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PORE Pree jaaceeeen| sary 5 ° 8 ” TEMPERATURE (°C) oe ey PERATURE WARM-UP DRIFT » DUE —_—ee TAGE vs TEM! = TTT] 3K ei 2 Ps Lt | gg» i LN =] De PTTAL LL z* SO a a7 7Y, see AN E = emer oe | 5 772g a5 ., N tt] peed eyerrorr & 4 WS) eT) SHAS “ron vanious an GAIN/SHASE RESPONSE 5 so CMRR vs FREQUENCY 2 U i “on __SONFIG ven " Nae vo Ta P [pf es) ASSAM So SEE HN :” 5 | 3 ms — rE IN i NN i COPED I CETTE | COA Bee ON Aad a a ‘ NN “HA > “COM TTA TIN marry 100 ak a. = ~ FREQUENCY (Hz)

TYPICAL PERFORMANCE CHARACTERISTICS INPUT BIAS CURRENT INPUT OFFSET CURRENT PSRR vs FREQUENCY vs TEMPERATURE vs TEMPERATURE “FI ‘beet TTT TT “Pes TTT TT] ve LLM | s S "OMIT pL gE PE ET en waa Pott te EA HH AA C1 oe Sees 4 “CHUN © PCLPR Ser Ce HAE SRSS eee ee «ELUM TTT TTT TCT LEE TTT LET TT INPUT WIDEBAND NOISE vs BANDWIDTH (0.1Hz TO TOTAL INPUT NOISE MAXIMUM OUTPUT SWING FREQUENCY INDICATED) VOLTAGE vs FREQUENCY we vs FREQUENCY » Foy ee "000 SS aa an . RE «SSE il A) AA =e Sa) SSS aS \\ Eff La | . pee HE a, LET NT Il mail cee ‘COO POWER CONSUMPTION vs VOLTAGE ve LOAD. OUTPUT SHORT-CIRCUIT POWER SUPPLY RESISTANCE CURRENT vs TIME mp POMER SUPPLY « ae ===—— eM == » SS AEE A g Primm eT NOLL PAA ome PRES 7a LI ce | UE TT LOT Ci ee

PRECISION HIGH-GAIN DIFFERENTIAL BILATERAL CURRENT SOURCE AMPLIFIER asic CURRENT SOURCE Re fa wy LN | Vino boat ‘ REA : > ° Two as bf 5 ton 3 3 ww Tue 1 “i lout € 16ma Ba 8 = TWonACURRENTSOURCE Vino—anr 2 ‘Nazar The high gain, gain linearity, CMRR, and low TCVog of 5 ae. the OP-77 make it possible to obtain performance not (an previously available in single stage very high-gain 22907 3 amplifier applications. 4 ve) =v loyy = 100mA, + lour Aq Ro = For best CMR, —— must equal — . In this example, 3 R2 R4 four Vin wens witha 10mV differential signal, the maximum errors are GIVEN B= R4+ RO, RE = RE as listed —— These current sources will supply both positive and TYPE AMOUNT negative current into a grounded load. COMMON-MODE VOLTAGE 0.01% /V Ra GAIN LINEARITY, WORST CASE __ 0.02% ( = t 1) Note that Zo = Be \\ Re — TCVos (0.008% /°C ore inet 20" a5 +R4 RS TClos 0.008%/°C__ R22. AL and that for Zo to be infinite, R5+R4 _ R3 ISOLATING LARGE CAPACITIVE LOADS ap musts Re OoF sev 9 our ee LNT inpuro =: = é so00 oourur 3 ear Tt sv = This circuit reduces maximum slew-rate but allows driving capacitive loads of any size without instability. Because the 10001 resistor is inside the feedback loop, its effect on output impedance is reduced to insig- nificance by the high open-loop gain of the OP-77.

PRECISION CURRENT SINKS HIGH STABILITY VOLTAGE REFERENCE ve a POSITIVE CURRENT SINK AL [ps 18 sav fe 3X] vin eos 7 G y= 10V 1520 vw ‘orRr Sex. FULL SCALE OF 1V, sBepmi*e iostav ay Ban Ww Ayer=18 POSITIVE CURRENT SOURCE m1 This simple bootstrapped voltage reference provides a precise 10 volts virtually independent of changes in power supply voltage, ambient temperature, and output = loading. Correct zener operating current of exactly fv snes20 2mA is maintained by R1, a selected 5ppm/°C resistor, vy? lt connected to the regulated output. Accuracy is primar- " Ie ton Mt ily determined by three factors: the 5ppm/°C tempera- Ry Vin <0v ture coefficient of D1, 1ppm/°C ratio tracking of R2 and R3, and operational amplifier Vog errors. g Vos errors, amplified by 1.6 (Ayc.), appear at the output and can be significant with most monolithic amplifiers. . . For example: an ordinary amplifier with TCVos of These simple high current sinks require that the load 5uV/°C contributes 0.8ppm/°C of output error while float between the power supply and the sink. the OP-77, with TCVog of 0.3uV/°C, contributes but In these circuits, OP-77’s high gain, high CMRR, and 0.05ppm/°C of output error, thus effectively eliminating low TCVog assure high accuracy. TCVog as an error consideration. PRECISION ABSOLUTE VALUE AMPLIFIER 19, 1a, +18 if 9 one She Sen UES | 4 x = 02 © Yout G ft}. 0 Vou < 10 vino al. og 2Nase3 ome oye H#_ ha Ra i = = eke ~18v fev ~ The high gain and low TCVos assure accurate opera- the op amps. The OP-77E CMRR of 1uV/V assures tion with inputs from microvolts to volts. In this circuit, errors of less than 2ppm. the signal always appears as a common-mode signal to -10-

LOW NOISE PRECISION REFERENCE +8v0 i 2 1OuF ; ep OK = Vo Vo Vo. 0 so00 [=> Your our This circuit relies upon OP-77's low TCVos and noise T combined with very high CMRR to provide precision = buffering of the averaged REF-01 voltage outputs. PRECISION POSITIVE PEAK DETECTOR uo ats _ t our aN L Vmo_i_3 ones . 7 " * one mag our al Some “By = T" = ~15v = RESET 1k JL"—*— Cy, must be of polystyrene, Teflon”, or polyethylene to rate is determined by the size of C},and the bias current minimize dielectric absorption and leakage. The droop of the OP-41. “Teflon is @ registered trademark of the Dupont Company. -11-

PRECISION THRESHOLD DETECTOR/ PRECISION TEMPERATURE SENSOR AMPLIFIER sv & ° ¢ our Re 2 = +15V nooks Vin 6 Ra Re

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Vino 24 = anetas nero oa ° Your Wo 6 » Your ina at 3 sew Yin GND Ena © our owe rd » TL wo & = When Vin < Vru, amplifier output swings negative, re- verse biasing diode D1. Vout = Vin if Ry = °° ————— SSSSsSsSSSSSSSSsSsSs When Vin= Vr, the loop closes, RESISTOR VALUES Re TGVouy1 SLOPE (S) vomv/eo 100mV/°C TomV/? F Cc ls selected t th th f the | RANGE +126°C +126°C +257°C is selected to sm . —— — ce elec ‘© smoo fe response of the loop. OUTPUT VOLTAGE -0.55V to ~5.5V to -0.67V to RANGE +125 +12.8V +2.57V ZERO-SCALE ov @o°C ov@orc OV @O°F R, (£1% Resistor) 9.09k 15k 1 T5ka Rs (+1% Resistor) 15k0 1.82ks 121k. Rigp (Potentiometer) 20012 5008 20082 R, (£1% Resistor) 5.1ko 845k 8.25k0 -12-