ffi# w ; ' ?Y D u a l O p e r a t i o n a lA m p l i f i e r T y p e A A 1 0 5 4 . 2 Amplifier Mounting U n i t T y p e T X 1 0 5 5. 2 Issue One Date May 1964 Mod. Ref . SO LA : 10 5 4. 2 / 1 5 1055.2/15 RTRO Manual N,n,,,uction The Solartron Electronic Group Ltd. Victoria Road, Farnborough, Hants. T e l e p h o n e :F a r n b o r o u g 3 h 0 0 0 . T e l e x : 8 5 4 5 S o l a r t r o nF n b r o . C a b l e s :S o l a r t r o nF a r n b o r o u g h . A Member of the Schlumberger Group. Printedin England CONTENTS a Section Page 1 Introduction and Data Summary 1 2 Principles of Opemtion and Brief Description 2 Installation and Operation 2 { r Circuit Description 4 5 Test Procedures 4 List of Components 8 3 : % ILLUSTRATIONS Figure 1 PL1 Connections 3 2 Typical Chopper Waveform 5 3 DC Slope Measurement 7 APPENDICES Appendix A DC Amplifier Section 1 INTRODUCTION AND DATA SUMMARY 1.1 Introduction T h e D u a I Op e ra ti o n a lAmp l i fi e r Type A A 1054.2 i s a' pl ug-i n' uni t compri si ng tw o independentbut identical general purpose d.c. amplifiers. Each amplifier may be used separately for summing, integrating or inverting operations. Overload indicators, 'set zero' controls and test point facilities for both amplifiers are available on the unit front panel. The inputs, outputs and all power supply connections are made on a 24-way plug at the rear of the unit. The SolartronAmplifier Mounting Unit Type T)( 1055.2 has been designed to house up to six Type AA 1054.2 units. Mating sockets for the amplifier plugs carry the power requirements and allow input and output terminations. t.2 Data Summary Each amplifier has the following electrical characteristics : Output Range - * 100 vol ts Output Current (max. ) - 5mA or 10mA into 10ko load d. c. gain - )1 a. c. gain (100c/s) - >1 x104 a. c. gain (10c/s) - >4 x 104 Input Current - <10-10 Bandwidth (gain of 10) - { lkc/s Stability - The amplifier will remain stable with an output load of 10ko and 10,000pF, and an input Ioad of 2?0pF on the summing junction with lMn or capacitive feedback. Power Requirements - + 3 0 0v o l t s d . c . x 10? without load "rrrp". - 300 vol ts d. c . Stabilised - 200 vol ts d. c . 6.3 vol ts a. c. at approxi mate d. c. bi as of +25 volt, with respect to common rail. 9 . 5 v o l t s a . c . a t a p p r o x i m a t ed . c . b i a s o f -100 vol t, w i th respect to common rai l . Note: Solartron Power Supply Type AS 1104.2 has been designed to supply twelve T y p e A A 1 0 5 4 . 2u n i t s - i . € . , t w e n t y - f o u ra m p l i f i e r s . 0 5 4. 2/7 - Mechanical Details TypeAA 1054.2 Dimensions H ei ght: ? in. width: 2.Bin. 7.1cm Depth: 1 1 .5 i n . 2 9 . 2 c m W ei ght: 3lbs. 1 ? .? 8 c m (overall) 1 . 3 6K g . AII units, sub-assemblies and parts a r e i n t e r c h a n g e a b l e . - M e c h a n i c a lD e ta i l s Dimensions Type TX 1055.2 H ei ght: 7 in. width: 19in Depth: 12.25in 31 cm Weight: 7lbs. 1 ? .? B c m 4 8 . 2 6c m 3 . 1 8K g S ecti on 2 PRINCIPLES OF OPERATION AND BRIEF DESCRIPTION 2.L Principles of Operation Se e S e c ti o n2 .1 o f Ap p e n d i x fA f . 2.2 Brief Description The Dual Operational Amplifier Type AA 1054. 2 is designed for rack mounting in conjunction with Amplifier Mounting Unit Type TXL0b5.2. Valves are located on the main printed circuit boards, and the chopper relays plug into separate sub-assemblies sitting in light traps to shield the input diode limiters. The printed circuit boards are in turn fixed to the amplifier unit of open construction. (See Frontispiece) chassis, Note: Printed circuit boards 00P501/503 comprising amplifier the whole forming a ,A, are the rearmost pair. Section 3 INSTALLATION 3. 1 AND OPERATION Unit Connections Plug 1 pin assignments for the Type AA 1054.2 DuaI operational Amplifier are shown in F ig' 1' T h e h e a te r s u p p l y c o n n e c te dbei w eenpi ns g and 21 reeas four val ves and must be co nnected on one side to a d. c. potential of +25 uo1tr, and the heater supply connectedbetween pins 10 and22, fe e d i n g tw o v a l v e s , mu s t b e connected on one si de to a d.c. potenti at of -100 vol ts. 2 WE c22 C2l rr O P.A, IO PF IOPF t3 I I SJA sGx t4 2 l5 3 t6 4 SG.B, TPI.B, t7 5 TPI A, t8 6 BLANK t9 7 SG.A. 20 I OVERLOAD A HEATERS 2l 9 H E A T E R S 6 . 3 v(AT+ 2sv B|AS) HEATERS 22 to H E A T E R S 9 . 5 '/ - 200v 23 ll cHASSIS - 24 t2 + 300v CRA, O P'8, CR.B, DLANK s G'l VERLOAD .8, 300v SJ'8, (Ar- loov BlAs) F i g .l - P L1 C onnecti ons The above require'ments are met by the Solartron Type AS 1104.2 Power Supply Unit ment ionedin S e c ti o n 1 .2 . Plug and socket assignments for the Type TX 1055.2 Amplifier Mounting Unit are shown in the circuit diagram at the end of the Manual - sockets SKl to SK6 providing connectors for six Type AA1054.2 units, sockets SK? and SK8 being used for patching and plug PLl for the power supply connections, 3.2 Operation If not used in conjunction with the Type TX 1055.2 Amplifier connections to the plug at the rear of the Type AA 1054.2 amplifier. Mounting Unit, make suitable In either case patch as required and allow several minutes for the equipment to warm up. Connect an oscilloscope at a sensitivity of about 100mV/cm to the amplifier test points marked tAt and tBt and adjust the associated tset zerot T. P.1. on the front panel in turn for amplifiers potentiometers to give zero mean d. c. component in the observed waveform. The provision of input and feedback components must be determined by the parameters of the application in which the amplifiers are to be used. It is not advisable to operate the amplifiers unless some feedback component is incorporated, C21 and C22 (see Fig.l) ensure high frequency stabilityunderall within the specification (see Section 1.2 - Stability). 1.2/r conditions of operation S ecti on 4 CIRCI.IIT DESCRIPTIONS 4. 1 D u a l Op e ra ti o n a lA m p tifi er Type A A 10b4.z Se e Se c ti o n 3 o f A p p e n di x ' A ' . 4. 2 Amp l i fi e r M o u n ti n g U n i t Type TX 105b.2 The Amplifier Mounting Unit Type TX 1055.2 accommodates six Dual Operational A m plif i e rs T y p e AA 1 0 5 4 .2 a n d c a n be mountedi n a standard l g-i nch rack. Each amplifier plug has a corresponding socket on the mounting unit - sockets SKl to SK6. The h.t., heater, common rail, signal ground and chassis outlets from the sockets are commoned and brought out to a connector PL1. C1 to C4 serve to decouple the h.t. s upplie s a t PL 1 . Output and summing junction outlets from each amplifier socket are taken to sockets SKT and SKB respectively and the overload outlets are commonld and brought out to socket SKg. Section 5 TEST PROCEDURES 5. 1 Equipment Required: The following test equipment is required: 5.2 (a) A s i g n a l g e n e r a t o rt o g i v e 0 . L c / s - 7 0 c / s a n d 1 0 0 c / s a t 1 0 v o l t s r . m . s . € . g . , S o l a rtro n C O 546. (b) A single beam oscilloscope with facilities for measuring between 1 millivolt a n d 3 0 0 v o l ts o n both a.c. and d.c. ranges to an accuracy of.Zvo,..g-.; s"r "r t r on CD 513 (c) A 2}ka/volt mutti-range meter of accuracy better than SVofuII scale deflection €.8., Avometer Model B. (d) P o w e r s u p p l i e so f + 3 0 0 , - 3 0 0 , - 2 0 0 v o l t d . c . a t b 0 m i l l i a m p s . 6 . 3 and g.b v o l t a ' c . a t d .c . bi as potenti al s of approxi matel y + 25 anA -tOO vol t d.c. r espect i v e l y , € . 9 . , S o l a r t r o nA S t l } 4 . Z . (e ) T w i n a m p l i fi e r t est set as show n i n Fi g.b. T e s t 1 - p o w e r Su p p l i e s c o n n e c t+ 3 0 0v o r t d . c . , - 3 0 0 v o l t d . c . , - 2 0 0 v o r t d . c . a n d h e a t e r ( 6 . 3 vorta.c. and 9' 5 v olt a ' c ' ) s u p p l i e s to th e te rm i nal bl ock on the ampl i fi er test set and pl ug the l ow freque ncy signal generator into SKD. Set switches SWA to position 1, SwB to position A, SwC to position 2, swF to position 2 and swc to 'oFF'. Plug the amplifier into the 24-way soct<eton the end of the flying lead' Allow time for the unit to *a"* up and then check the following voltages at the points stipulated within the unit. (a) -300 (*10) volt d.c. betweenpin 24 of plug l and chassis (pin 24 is negative) u s i n g th e 2 0 k n /v ol t meter on the bOOvott a.c. range. wl 5.3 ( b) + 3 0 0 (* 1 0 ) v o l t d .c . b e tw eenpi n 12 of pl ug l and chassi s usi ng the 2Okn/vol t me te r o n th e 5 0 0 v o l t d . c. range. (c) -2 0 0 (+ 1 0 )v o l t d .c . b e tw eenpi n 23 of pl ug l and chl ssi s (pi n 23 i s negati ve) using the 2lka/volt meter on the 250 volt d. c. range. ( d) 6 .3 (* 0 .3 ) v o l t a .c . b e tw eenpi ns 9 and 2l of.pl ug 1 usi ng the 20ko/vol t meter o n th e 1 0 v o l t a . c . ra n ge. (e) +25 volt d.c. approximately between pin I and chassis using the 20ko/volt meter o n th e 1 0 0 v o l t d .c . ra n ge. (f) 9 .5 (+ 0 .3 ) v o l t a .c . b e tw eenpi ns 10 and 22 of.pl ug 1 usi ng the 20ko/vol t meter o n th e 1 0 v o l t a . c . ra n g e. .(g) -100 volt d.c. approximately betweenpin 10 and chassis using the 20kn/volt m e te r o n th e 2 5 0 v o l t d . c. range. Test 2 - Chopper Waveform and DC Offset. (a) With the test set connectedas in 5. 2, switch SWF to position 3, monitor the test point, SKE, with the oscilloscope on the 1 volt,/cm. a. c. range. Check that the chopper waveform is stable and set the chopper signal for zero d.c. component by adjusting RV1 on the front panel of the amplif ier (See Fig. 2). Fig.2 - Typical Chopper Waveform (b) With the test set connectedas in 5. 3 (a), switch SWF to position 4 and SWB to position B. Repeat the procedure of 5.3 (a), adjusting RV2 on the front panel of the amplifier to balance chopper signal. Amplitude l2 volt peak-to-peak. (c) With the test set connectedas in 5.3 (b) switch SWB to position A, SWC to position 2 and SWF to position 3. Monitor the test point(SKC)with the 20ko,/volt me te r o n th e 2 .5 v o l t d .c. range and adj ust R V 1 for zero readi ng. S w i tch S W F to p o s i ti o n 2 a n d m o n i tor the d.c. off-set on 50pA range. It s h o u l d n o t' e x c e e d 1 0 0 mi l l i vol t. AVO model 8). )4.2/r (N ote: 50r.rA= 125mV f .s.d. on (d) With the test set connectedas in 5.3 (c), switch SWB to position B and SWF to position 4. Adjust RV2 for zero reading. Switch SWF to position 2 a n d mo n i to r th e d .c . o ff-set on the 50pA range. It shoul d not exceed 100 mi l l i v o l t. (e) With conditions as for 5.3 (d) check with the oscilloscope that the chopper w a v e fo rms a p p e a r o n T e st P oi nt 1 of ampl i fi er' A ' and Test poi nt 1 of amplifier'B'; both points on the front panel of the amplifier. Remove the Z}kn/volt meter f rom SKC. 5.4 Test 3 - Noise (a ) (b) 5.5 Test 4 - Leakage (a) (b) 5.6 (e) sw i tch sw B to posi ti on A ' S W C to w i th th e te s t s e t c onnectedas for 5.3 p o s i t i o n 6 a n d S w F t o p o s i t i o n 2 . w i t h t h e o s c i l l o s c o p e omeasure n t h e l 0 0 the millioscillating and volt a. c. range, check that the output is not amplitudeofthenoise.Itshouldnotbegreaterthan?Smillivoltpeak-toPeak. (a) switch swB to position B' check with the test set connectedas in 5.4 the amplitude of noise ' It measure that the output is not or"itt"ting and peak-to-peak. ?5 millivolt than greater should noiu" (b), switch syB- to position A and with the test set connectedas for 5. 4 ttr" 20kn/volt meter on the 50pA press conneci swE. ?. swc to position the voltage on the meter range to test point (sKct. ielease swE. Measure 100 millivolt' exceed not should It SwE. l0 seconds after releasing (a) switch swB to position B and repeat with the test set connectedas for 5. 5 the Procedure of 5 ' 5 (a) ' Test 5 - StabilitY. (a) (b) (c) (d) (e) (f) connectedas for 5'5 (b)' Remove the 20ko/volt meter. With the test set swG to 'ON'' Monitor and 8, switch swB to position A, SWC to position volt a ' c ' range and a{j99t SKE or SKC with the oscitloscope on the 300 cycles.per second at sKE or 100 peak-to-peak, volt 200 for the oscillator oscilloscope range the adjust sKC. switch swF to position 1 and accordingly.(Rangeroo*v/c'").NowpressandreleaseSw Dandcheck of oscillation' Repeat this that the amplifier is stable and gives no iigtt procedurefbrSwApositions2toSinclusive. summing junction of the. Note that by pressing and releasing swQ the signal ground: this being to strorted amplifier ,rrra"" test is temporaril! amethodofstartingnon-linearoscillation. (a), switch swB to position B and with the test set connectedas for 5. 6 (a) ' repeat the procedure outlined in 5 ' 6 (b), switch-SWB to position A' SWC With the test set connectedas for 5.6 ihe oscillator to give 200 volt peak2. position to position 9 and SWF to -!et Now switch SWF to to-peak, 100 cycle" p"i second, at SKE or SKC. (b). 5.6 given in the procedure position 1 and ""p""f (c) switch swB to position B and repeat with the test set connectedas for 5. O (c) ' th e p ro c e d u re for 5.6 (d) switch swB to position A ' with the test set connectedas for 5 ' 6 Monitorthevoltag"onTestPoint2onthefrontpanelofamplifier-'A' withtheoscilloscopeonthe300volta.c.range.Itshouldbenotlessthan 1 ? 5 v o l l P e a k -to-P eak' (e) switch swB to position B ' with the test set connectedas f or 5 . 6 with the oscilloscope' Monitor the voltagu on Test Point 2 of amplifier'81 Itshouldbenotlessthanl?Svoltpeak-to.peak. 5.7 T e s t 6 - Ov e rl o a d . (a) (f) switch swA to position 3' SWB to with the test set connectedas for 5.6 Increase the drive of the oscillator s. pt"itio" position A and swF to the front panel of the amplifier on neon indicating the LPl, until lamp point with the oscilloscope on the test ttt" Iights. M"""ore the voltage it volt peak-to-peak' 30 volt range. It should indicate not lesl than 5 (b) 5.8 5.9 With the test set connectedas in 5. ? (a), switch SWB to position B and SWF to position 6; and with lamp LP2 lit, measure the test point voltage as in 5 .? ( a ) . TestT-ACGain. (a) With the test set connectedas for 5.? (b), switch SW{ to position 1, SWB to position A, SWC to position 5 and SWF to position 2. Set the oscillator to give 200 volt peak-to-peak, 100 cycles per second at SKE or SKC and measure with thb oscilloicope on the 300 volt a.c. range. Now switch SWF to position 1 and measure the test point voltage on the 30 millivolt range of the oscilloscope. It should be not greater than 20 millivolt peak-to-peak. (b) With conditions as for 5.8 (a), switch SWB to position B and measure again. The test point voltage should not exceed 20 millivolt peak-to-peak. (c) With conditions as for 5.S (b) switch SWB to position A and SWF to position 2. Decrease the frequency of the oscillator to 10 cycles per second and set it to,give 200 volt peak-to-peak at SKE or SKC. Now switch SWF to position 1 and measure thetest point voltage on the 30 millivolt range of the oscilloscope, It should be not greater than 5 millivolt peak-to-peak' (d) With conditions as for 5.8 (c) switch SWB to position B and re-measure. test point voltage should not exceed 5 millivolt peak-to-peak. TestB-DCGain. (a) With the test set connected as for 5. 8 (d) switch SWC to position 4 and SWF to position ?. Monitor SKE or SKC with the oscilloscope on the 300 volt d.c. range and drive the time-base of the oscilloscope with the oscillator output. Set the oscillator to give 250 volt peak-to-peak, 0.1 of a cycle per second, at SKE or SKC. (b) With the test set connected as for 5. 9 (a) switch SWF to position 2 and with the o s c i l l o s c o p eo n th e 3 0 0 mi l ti vol t d.c. range, measure the d.c. sl ope of the Iine ignoring the super-imposed a.c. noise. It should not exceed 50 millivolt, as indicated in Fig. 3 . Note that althougtr-SWBis switched to position B, the gain of amplifier'A' is being measured. (c) With the test set connectedas for 5. I (b) switch SWB to position A and remeasure the d. c. slope. It should not exceed 50 millivolt. Fig. 3. 54.2/r The DC Slope Measurement LIST OF COMPONENTS P r int e d C i rc u i t B o a rd As s e mb l y OOpbOl See Appendix 'A' P r int e d C i rc u i t Bo a rd As s e mb l y O Opb03 RESISTORSVARIABLE Description Cir c u i t Ref. RV 1 RV I (A m p ' A' ) W i re W o u n d (Amp ' B' ) Wi re Wo u n d Value Ohms Tol 7o Rating Watts lK 10 1 Colvern CLR L2o6/gs/s lK 10 1 C ol vern C LR L206/95 / S Manufacturer and Type CA PA CITOR.S Cct. Ref . Value pF Tol. * c6 .047 * c6 Rating Volts Manufacturer 10 4 00 Wima Tropyfol M. Mpl .041 10 400 Wima Tropyfol M. Mpl B30pF 2 500 S ufl ex H .S . po. B3 0 p F 2 500 S ufl ex H . S . po. .0033 10 4 00 Wima Tropyfol F. Mpl .0033 10 4 00 Wima Tropyfol F. Mpl ol /o & Type AMP'AI AMP IB' AMP IA' * c? AMP IBI * CT AMP 'A' * c8 AMP 'BI * cg Circuit Ref. Cz t C22 Description P o l y s ty re n e T u b .In s . Polystyrene Tub. Ins. Value pF 10pF t0pF ToI +lpF *lpF Rating Volt! 500 500 r Manufacturer and Type G.E.C. G.E.C. MISCELLANEOUS Cct. Ref . ILPl ILPl TP1 TP1 TP2 TP2 PLl Description Manufacturer & Type !t-p l{l) t amp (without Resistor) Clear l-amp (without Resistor) Clear 11*p ']flJ A') !Amp 'Br) So c k e t p re s s fi t Red (Amp Socket pressfit Red (A*p 'A') Socket pressfit yeltow (Amp 'B') Socket pressfit yellow Plug Red (2 off) ) Supplied with Plug Yellow (2 off) ) unit Plug 24-Way Arcolectric A rcol ectri c Sealectro Sealectro Sealectro Sealectro SLBO SLSO SKT.5O SKT-50 SKT.50 SKT-50 Sealectro FT-M-? McMurdo XRP24 + On Printed Circuit Board OOpbOl wE/ \x s1 t\ + \}"(t) o F I 9r b; o o o F 3 rr-t I I , , < \ a--r-J :l c 3 ! AEEEA@EEE e/s F )'o nooz)'c ^oot )o Aool+ !: g EEE@@ (vrenoor-r) r v ns'o r) :v nc.e (vrensz+ I o o F o o & U a oa g F q = tr k O N N ? rl? ul x F I ro b; k q o !lo l 6 l > ; o < x o + N a ? O d d b o t a O d - b 3 > 2 8 f F 5 s S s S (,1 + R - r - 6 l < - 6 6 j o - € q a . O l oAoA*A-A. I IJ l o o + f i l r : ).,2\a o o gg l i - q o q z o J E 6 )l : n 6 6 - n 6 - h q 0 0 - = o APPENDD('A' D C A MP LIFIE R used on \4.2/l AA 1054.2 Dual Operational Amplifier AS 1102 +100V and -100V Reference Supply TR 1322 Mark-Space Multiplier TR 1323 Mark-Space Multiplier Issue : One D ate : January, 1964. LIST OF CONTENTS Section 1 INTRODUCTION AND DATA STJMMARY 1 .1 In tro d u cti on 1 .2 D a ta S u m marv PRINCIPLES OF OPERATION AND BRIEF DESCRIPTION 2.1 Principles of Operation 2 .2 B ri e f D e scri pti on CIRCUIT DESCRIPTION AND OPERATION 3 .1 AC C h a nnel 3 .2 D C C h a nnel 3 .3 M i x e r Stage 3.4 Output Stage 3 .5 O p e ra ti o n 3.6 Overload Indication LIST OF COMPONENTS DIAGRAMS Figure 10 1 Component Location Printed Circuit Board OOpbOf 2 Component Location Printed Circuit Board OOpbO3 3 Circuit Diagram ooP501/503 Section 1 INTRODUCTION AND DATA SUMMARY 1. I Introduction The amplifier described in this Appendix is a standard d.c. amplifier as used in the Dual Operational Amplifier Type AA1054.2 and incorporated in thi twin (+ and -) 100 volt Reference Supply Type nSttOz, Mark/Space Mbdulator Type TRl322 and Height Modulator Type TR1323. t.2 Data Summary Output Range - + 100 vol ts Output Current (Max. ) - 5mA,or 10mA into 10ko load DC Gain - >1 x 10? without load AC Gain 100c,/s - >1x104 - >4 x 10' l \c /s Power Requirements - 4 + 300 vol ts d. c. ) ) -300 vol ts d.c. ) ) -200volts d.c. ) nomi nal stabi l i sed 6.3 vol ts a.c. at approxi mate d.c. bi as of + 2b vol t with respect to common rail. 9.5 vol ts a.c. at approxi mate d.c. bi as of - 100 vol t with respect to common rail. Section 2 PRINCIPLES OF OPERATION AND BRIEF DESCRIPTION 2.L Principles of Operation An input signal applied to the summing junction is split and amplified through two channels - a high- frequency channel, capacity coupled; and a low frequency channel via the mechanical chopper. The two channel outputs are added at the input of a mixer stage which, in conjunction with the output stage, provides considerable gain. Zerofrequency gain of the chopper channel is approximately 60db (i.e. 1000) and the parallel high frequency channel-gain is anprgximltely 26-iu (i.e. zoi. rtre gain of the mixer a nd out put s t age s i s a p p ro x i m a te l y B 0 d b (i .t-10,000) l o* frequenci es. A fter summati on of the signals at the-mjxer stage, th9 overall gain and phase " t of the amplifier is controlledby int e r n a l f e e d b a c k( R 1 ? , R l B , R 1 9 ; R V 1 ; C g , - C g , C 1 g i . This type of circuit configuration provides maximum low frequency gain with minimum overall stability problems. t'z/t 11 2.2 Brief DescriPtion T he d .c . a mp l i fi e r c o mp ri s e s tw o pri nted ci rcui t boards OOP 501upon which the valves and associated componentsare mounted, and OOP503 holding the chopper relay and input resistors. Harwin pin terminations on the boards provide for connecting power supplies and Iinking to panel mounted components, - i.e. test points, overload indicator, adiustment potentiom et er . Holes drilled in the boards to accommodate 4BA bolts facilitate mounting in the respective equipments. Section 3 CIRCUIT DESCRIPTION AND OPERATION 3.1 AC Channel Signats at the input junction S. J. (pin 5) are a. c. coupled to triode VlA grid via capacitor C1. Diode limiter MR5 and MR6 in parallel with the input clamps the signal at approximately *0.6V to prevent the build- up of nonlinear lockout oscillations. The amptified output from VlA anode is coupled to the control grid of pentode V lB by C5. R 8 w i th C 6 a n d R 1 3 w i th C? are phase correcti on components. 3.2 DC Channel Signals from the input junction SJ (pin 5) are taken via R4, R5 to one contact of chopper relay RL1, the purpose of which is to alternately connect R4 to ground and leave i t Thus a pulsed signal at triode V2A grid is produced, the free at a frequency of 100c/s. amplitude of which is proportional to that at the input. The amplified signal at V2A anode is a. c. coupled by C13 to pentode V2B grid for A second contact on RL1, coupled to V2B anode by R28-C16r synfurther amplification. chronously rectifies the pulsed signal to provide d. c. restoration. MR3 in series with R42 energises 3.3 'A' supply. RL1 coil from the 6. 3 V heater Mixer Stage junction is applied to mixer pentode V1B grid via R11 The d.c. signal at C16-RLl and controls the operational d. c. conditions at the anode. V1B cathode potential is determinedby the setting of potentiometer influences the d.c. levels of the following direct coupled output stage. 3. 4 RV1, and this O u tp u t Sta g e Triode-pentode V3A-V3B in cascode comprises an amplifier enabling considerable gain to be achieved whilst being capable of delivering a reasonable output current. R40, R41 and VT1 form a potential divider across the mixer output. VTl, in the lower limb, has a high dynamic impedancebut a low d. c. volt drop. Thus a large d. c. volt drop t2 wE./105/ a c r os s R40- R4 1 c a n b e a c h i e v e dw i th o u t s eri ous si gnal l oss, the si gnal at R 41-V Tl j uncti on going to V3B grid. Zenet diode MR4 \s a22 volt base clamp for VT1, while MRz prevents VT1 collector pot ent ial f r o m e x c e e d i n g2 5 v o l ts u n d e r sw i tch-on condi ti ons - i .€., shoul d h.t. be appl i ed before V3B has warmed-up, to enable the cathode-grid diode action to function. R34 is provided in series with a test point to prevent an accidental short circuit occurring. V3A cathode is prevented from exceeding approximately 150V with respect to the common rail by voltage dependentresistor R43. 3.5 Operation On positive going signals current from the amplifier is taken from V3A cathode. On negative going signals V3A virtually cuts off and current is taken from the anode of V3B. When this current is such that the potential across R33 exceeds 18 volts , Zener diode MRl conducts to allow the extra current to flow through RZ1. 3.6 Overload Indication The presence of an overload condition is detected by a neon indicator which strikes when the output from the d. c. channel at the junction of c16 and RL1 reaches approximately 60 volts. r.2/r 13 COMPONENTS LISTS PRINTED CIRCUIT BOARD OOP5O1 RESISTOR,S Cct. Ref . Description R1 R2 R3 R? R8 Not fitted R e s. C o m p .G R 2 .In s . R e s .C o m p . G R 2 . I n s . R e s. C o m p .G R z . In s . R e s .C o m p . G R z . I n s . 1M 100 100 200K 10 10 10 10 R9 R10 Rl1 Rl2 R13 Res. Comp. GR2. Ins . R e s .C o m p .G R 2 . I n s . R e s .C o m p . G R 2 . I n s . R e s .C o m p .G R 2 . I n s . R e s .C o m p . G R 2 . I n s . 680 2.7K 4 .? M 100 1 80K 10 10 10 10 Rl4 R15 Rl6 Rl? R18 Res. Comp. GR2. Ins . Res . Comp. GR2. Ins . R e s .C o m p . G R 2 . I n s . R e s .C o m p .G R 2 . I n s . R e s .C o m p .G R 2 . I n s . 1 .8 K 110K 27K 1M 100 1 Rl9 R20 R21 R22 R23 R e s .C o m p . G R 2 . I n s . R e s .C o m p . G R z . I n s " R e s .C o m p . G R 2 . I n s . Res. Comp. GR2. Ins . R e s .C o m p . G R 2 . I n s . 5 6K 100 470 22K 220K 10 10 10 10 10 I 4 I 4 I 4 I 4 I 4 R24 R25 R26 P.27 R28 R e s. C o m p .G R z .In s . R e s .C o m p . G R 2 . I n s . R e s .C o m p . G R z . I n s . R e s. C o mp .GR 2 .In s . R e s .C o m p . G R 2 . I n s . 3. 9K 3 .3 M 100 l BOK 47K 10 10 10 10 10 I 4 t R29 R30 R31 R32 R33 Res. Comp.GR2. Ins . R e s .C o m p . G R z . I n s . R e s .C o m p . G R 2 . I n s . R e s . C o mp .GR 2 .In s . R e s .C o m p . G R 2 . I n s . 2.2K 820K 5 6 0K 100 4.?K 10 10 5 10 10 R34 R35 R36 R3? R38 R e s .C o m p .G R 2 . I n s . R e s .C o m p .G R z . I n s . R e s .W . W . V i t . R e s .C o m p . G R 2 . I n s . R e s .C o m p . G R 2 . I n s . 4 ?K 6.8K 4.7K 22K 330K 10 10 10 10 10 1 1 R39 R40 Res. Comp. GR2. Ins . 150K Res. Film(Carbon) GRl. Non.Ins. 1.lM Res. Film(Carbon) G R l . N o n .In s . 1.1M R e s .C o m p . G R 2 . I n s . t20 Vdltage Dependent Res. 10 1 2 1 R41 P"42 R43 L4 Value Ohms To1. % Rating watts I 4 I 1 I 4 I 4 I 4 I 1 I 4 I 4 n t 7 1 0 1 0 1 0 1 2 10 + l i 0 1 I 4 I 4 I 4 I 4 I 1 I 4 I I 1 l_ 4 I 4 3 I I + + Manufacturer & Type Dubilier Dubilier Dubilier Dubilier BTT BTT BTT BTT Dubilier Dubilier Dubilier Dubilier Welwyn Metox BTT BTT BTT BTT F22 Dubilier WeIwyn Metox Dubilier Dubilier Dubilier BTT F22 BTT BTT BTT Dubilier Dubilier Dubilier Dubilier Dubilier BTT BTT BTT BTT BTT Dubilier Dubilier Dubilier Dubilier Dubilier BTT BTT BTT BTT BTT Dubilier Dubilier Dubilier Dubilier D ubi l i er BTT BTT BTT BTT BTT Dubilier Dubilier Painton Dubilier Dubilier BTT BTT P3064' BTT BTT Dubilier BTT I I I 4 ! 4 Welwyn Welwyn Dubilier Mullard c2l c2L BTT E299DC/P346 WI CAPACITORS Cct. Ref . c1 e4 c5 c6 c1 c8 Description Value pF Cap.M e t. Pl a s . T u b .In s .1 Cap.El e c tro l y ti c 100 Cap.M e t. Pl a s . T u b .In s ' .2 2 Tol. 7o Rating Volts 10 L25 6 400 Wima Tropyfol 'M' Wima Printlyt Wima Tropyfol 'M' 10 400 6 500 350 400 Wima Tropyfol Wima Printlyt Suflex Hunts Wima Tropyfol 10 10 20 6 350 400 630 400 Wima Hunts Wima Wima Wima 10 6 400 Wima Printlyt Wima Tropyfol 10 Manufacturer & Type See Component List of Unit in which used. Cg C10 Cll Clz C 13 Cap.Me t. PIa s . T u b . In s . .0 4 7 Cap.E l e c tro l y ti c 100 Cap.P o l y s ty re n e 10pF Cap.Electrolytic 2 Cap. Met. Foil . Tub . Ins . . 1 C14 C15 C16 CL? C 18 Cap.E l e c tro l y ti c Cap.E l e c tro l y ti c C a p . M e t .F o i I . T u b . I n s . Cap.Me t. Pa p .T u b .In s . Cap. Met. Foil . Tub . Ins . C19 C20 Cap. El e c tro l y ti c Cap.M e t. T u b .In s . 100 2 .041 .01 1000pF 100 0. 1 10 *1pF 'M' H.S. MEW118T 'M' Printlyt MEW118T Tropyfol 'M' Tropyfol 'F' Tropyfol 'F' 'M' VALVES Cc t . Ref . Description Manufacturer & Type Vl V2 V3 Valve Valve Valve Mullard/Brimar Mullard/Brimar Mullard/Brimar ECF82 or 6U8 ECF82 or 6U8 PCF82 or 9U8 SEMICONDUCTORS i4.2/t Cct. Ref . Description Manufacturer & Type VT1 Transistor Texas Instruments 25?01 Jermyn Ind. Type TO.5 MRI. Silicon Zener Diode MR2 MR3 MR4 Diode Diode Silicon Zener Diode International Rectif iers A .E .I. A.E.I. International Rectif iers ls[E.ZL8Tl0 N[S1H N[S1H MEZ22TL0 15 COMPONE{TS LISTS PRINTED CIRCUIT BOARD OOP5O3 RESISTOR.S Cct. Ref . R4 R5 R6 Description Res . Comp. GR2.Ins . R e s . C o m p .G R 2 .In s . R e s .C o m p . G R 2 . I n s . Value Ohms z.'tM 4?0K 10M Tol. 7o 10 10 Rating Watts I 4 r 10 t4 Rating Volts Manufacturer & Type Dubilier Dubilier Dubilier BTT BTT BTT CAPACITORS Cct. Ref . Description Value pF Tol. % CZ C3 Ca p .M e t. T u b . In s . Ca p .M e t. T u b .In s . .041 0. 1 20 10 L25 tLl l\flanufacturer & Type Wima Tropyfol Wima fropytot ,M, ,Mr SEMICONDUCTORS Cct. Ref . Description MRb MR6 Diode Diode Manufacturer & Type Mullard Mullard OAZO? OAZO? MISCELLANEOUS Cct. Ref . RL1 Description Rating IVlanufacturer & Type Relay Sync. Chopper plus Chopper Top Cap. 100cls 6 .3 V A.E.I. cK4 16 wE/Lol , ) c 2 0 t 7 t 2 +o6;o t o 2 [j o 2 2 l t l fh"nl E==-Nffi il L _ tL - ' | ; ( v , ) i l l : C Er r:rtr,| .EJilhtff E ( ",)% l.,luEE+l ore o16 r y ;+.l b H a-) [J l--l r_rr-_:__rlrrl \./ \ / n'|-rl'ln)=; l'''lllil g- O z a Lil.iEbIEO E :rT,st l'''I t i r-"__l r'--' o23 o27 I l f-.r.- ora Qe H l--T;-l eH-48,ffi Fig.1 - component Location : printed circuit O r o Ji,'14 ors o'7 B,qard oopSol N O T E: D t o D E S M R5 , M R 6 M O U N T E D O N C O p p E R S fD E OF BOARD. wE/ro54.2/r Fig.2 - componentLocation: printed circuit Board oopbO3 AP PE N D X B T e c h n i c a l M a n u al : A S 1403pow er S uppl y U ni t /1 Appendix B A S 1403 P OW E R S U P P LY T h e A S1 4 0 3P o w e r S u p p l y c o m pri ses an A S 1Lo4.2 P ow er S uppl yandamai ns suppl y sw it ching and distribution circuit. SA and SB are, respectively, the HEATER ON and HT ON switches . Sockets SKTA, SKTB, SKTC and SKTD route mains power to pins p and R, plugs pLA on a maxim um of fo u r T u to rs . S o c k e t SK T E l i nks w i th pl ug pt 1 on th; A S 1104.2 pow ei S uppty. LIST OF COMPONENTS Cct. Ref . Description SA SB SKTA SKTB SKTC Switch Toggle DP Switch Toggle DP Socket 3 Way Socket 3 Way Socket 3 Way SKTD SKTE Socket 3 Way Socket 6 Way AS1104.2 Power Supply (SeeAppendix B) Solartron P art N o. c/o,6A c/o,6A Manufacturer and Type 3 ? 6 00 0 0 8 0 3 ? 6 00 0 0 8 0 3 5 1 50 3 0 4 0 3 5 1 50 3 0 4 0 3 5 1 50 3 0 4 0 Painton Painton Bulgin BuIgin Bulgin 501085 501085 sA2026 sA2026 sA2026 3 5 1 50 3 0 4 0 3 5 1 40 6 0 1 0 Bulgin P l essey sA2026 cz490L7 J & F f tlJ z lu F :( t/, o F :l tt J o- () f o- t t/1, F d) F F .t Hf A n v H e r Z j l ,t l * .t, r ,n G l O ppP? t z H6 CIRCIIIT DIAGRAM : AS1403 POWER SUPPLY LTNIT B.B/1351/r