... must also thank Sheila, my necessary using Sony type BP90 Maplin's monitor boxes, saying that wife, for her patience, particularly at batteries, or NP1 batteries with it was as easy to build from scratch as tricky moments when the air got a bit Finished Control an adapter. to pierce an existing box. blue and the cats were scared. Panel References: 1 Locking onto Video Sync, Michael Cox, Electronics World, February 1996, Vol. 102, No. 1719 2 Analyse Your SD! , Emil Vladkov, Electronics World, February 2002, Vol. 108, No. 1790 3 Professional SD! Router, Emil Vladkov, Electronics World, August 2003, Vol. 109, No 1808 4 The Digital Interface Handbook, Francis Rumsey, John Watkinson, Focal Press, ISBN ...
... HIGH POWER VALVE 140 AUDIO POWER WITH A Cover - Hashim Akib AUDIO NEW LOOP A KT88-based push-pull power amplifier In Marcel van de Gevel's high-performance forms part of Morgan Jones' discussion of power amplifier, quiescent current is high -power valve audio. stabilised via feedback, using a non-linear common mode loop. 114 LOCKING ON TO 168 MATHCAD GETS A PLUS VIDEO SYNC Allen Brown looks at the latest release of Michael Cox has been designing with a Mathcad and its DSP analysis option highly integrated solution to sync pulse generation and video -signal genlocking, namely the SAAI 101. Regulars For the first time, satellites have communicated without 119 MODELLING CABLE the intervention of a ground station - Update, Analysing loudspeaker cables using Spice, page 92. Ben Duncan discovered that cable format 91 COMMENT can have an affect on audio ...
... an electronic delay, which in turn starts a middle of a field and its open time is field counter to determine the exposure time, i.e. 1, 2 or 4 fields duration. A frame pulse is formed to gate the colour signals to the television monitor. These colour signals are derived Television consultant. from a PAL decoder, which also supplies the synchronizing pulses to operate thefield counter t Michael Cox Electronics Ltd. and to synchronize the monitor.. _ uïsus1` l'I - Wireless World, June 1972 91 at slightly different times. The M or FP contact, used with flash bulbs, closes as the first shutter blind starts to move, thus (a ) T. V. exposure giving the flash bulb approximately 25ms to reach its peak brightness coincident hutter opens shutter closes with ...
... Test equipment is, of course,cours e, an essential tor the for the shadow-mas k tubes. on the shadow-mask N.T.S.C. signals, signals, by by amateur of today, and of particular interest was was thethe courtesy of the B.B.C. were decoded and fed fed outout alsoalso oscilloscope* . An Dartronic Type 381 oscilloscope* . circuit unusual circuit An unusual by the same transistor amplifiers (built by Michael Michael Cox) . Cox) . feature of this design is the method of feeding the h.t. to the h.t. to These consist of a long-tailed pair of OClVOs OC170s feedingfeeding the first y-amplifier stage and and the pair of the pair cathode of cathode a GT43 output stage; stage: to set gain gain and ensure good and ensure goo_d followers driving the y-plates. Each of these requires requires ...
... dock. At S.T.L. Mr. Coupland as- sumes responsibility for semicon- ductor devices, techniques for microelectronics, cold cathode emis- sion and the synthesis of materials used in components. Professor F. Graham Smith, M.A. Ph.D. of the Nuffield Radio Astronomy Laboratories, Univer- sity of Manchester, has been ap- pointed part -time deputy director of Leslie H. Bedford, C.B.E. M.A, Michael Cox, B.Sc. (Eng) , has re- the Radio and Space Research Sta- B.Sc. F.I.E.E. M.I.E.R.E. retired signed as senior supervisory en- tion of the Science Research Coun- from the post of director of en- gineer in the Research and De- cil at Slough, for two years from I. G. Cressell gineering of B.A.C's Guided velopment Department of ABC January 1st, ...
... , requires the use of a measuring bridge. the crest working reverse voltage. Average on -stat within a proportionally controlled oven as pro- A simple reasonably -priced instrument developed current is 16A and maximum junction temperatura tection against changes in ambient temperature specially for this purpose is the return loss bridge is 125 C. These thyristors have shorted gate -to and all connections are made via solder terminals type 131 by Michael Cox Electronics. This is of cathode structures and use field- assisted turn-ot on the base of the unit. A hermetically sealed ver- Wheatstone type, with modifications to allow for techniques. They can tolerate rapid increases it sion is produced. To compensate for crystal ageing single -ended source and detector. The source can voltage and current and will operate under arduous the oscillator frequency can be adjusted ...
... to making the changeover of all the television informed that the point referred to by your second corres- services in the U.K. to these new standards a success. pondent (Mr. D. Smart) has been taken into con- It was never thought that this would be an easy task, sideration. particularly since the change in standards was further With regard to the letter from Mr. Michael Cox which complicated by an extension of television broadcasting appears in the same issue, the acceptance of BBC -2 to the u.h.f. Bands IV and V. has admittedly fallen far short of what we in the receiver The question of colour television has again given rise industry would have wished, but this is for other than to a spate of arguments that the I.T.A. should be technical reasons. ...
... protection" by M. C. S. Simpson at 18th. IEE - Colloquium on "Field effect device 18.30 at Lanchester Building, University of HEMEL HEMPSTEAD Southampton. applications" at 10.30 at Savoy P1. WC2. 20th. IEE - "Thermal imaging - techniques and 20th. RTS - "SECAM - the other European applications" by W. Lawson at 19.30 at Dacorum colour standard" by Michael Cox at 19.00 at the UXBRIDGE College of Further Education. Conference Suite, London Weekend Television, 28th. IEE - "Some aspect of artificial intelli- South Bank TV Centre, Upper Ground, SE1. HULL gence" by Prof. I. Aleksander at 18.30 at Brunel 12th. SERT - "U-matic video cassette" by a University, Kingston Lane. 21st. 1.Phys. - Meeting ...
... , Broadcasting Division, Chelmsford, Essex CM I IPL, include: B7320: 10kW u.h.f. TV transmitter WW427 B7317: u.h.f. i.f. drive transmitter WW428 B3215: mark VIII automatic colour TV camera .. WW429 Prices and details of standard equipment for (a ) TV signal coding and colour caption synthesizing and (b ) vision mixing and special effects are listed in a leaflet for September 1972. Michael Cox Electronics Ltd, 67a Holly Road, Twickenham, Middlesex TW 14HF WW430 The "AC" series of solid -state timers for switching Products included in the Lucas 1972 -73 abridged a.c. power is specified in a leaflet. Models in the ACTIVE DEVICES catalogue, are semiconductor and optoelectronic range have overlapping ranges from 0.1 -5s and Arrow Electronics Ltd,7 Coptfold Road, Brentwood, 6 -300s with ratings up ...
... the peak Peak Buffer Tr, Led la right hand op-amps should not be green illumination could be set for — 6dBm, being standard level for much unbalanced audio detect 12+ RIO IC,d 1808 se connected to Headphone ground equipment. 1k5 ,3 12.074 (centre data) ' as shown, but to the At + 6dBm, the red LED is fully lit. Green input ground at the left-hand side Michael Cox, CEng. FIEE of the circuit diagram. 47k Twickenham we. F81 kf é 3r D R, 47k B Tr 8 BT2 PP3 Level dependent nverter R12 2k2 -9V (F81) Swib Three-phase sine generator This generator can be used for example to followed by afourth-order low-pass filter to make it possible to achieve aphase-shift of symmetrical around 8(6 count pulses high Outputs Q3 of /C2 and ...
... - The monitor bank facing the desk has a row of 14 -in. monochrome monitors has very comprehensive mon toring tained. The transmission controlle- and a row of colour moritors cnder- and switching facilities which include sAs ventrally before the monitor bank. These preview incoming a vectorscope and a subcarrier phase c ocks, telephones and talkback keys neath. sources, check the passage of signals meter (by Michael Cox Electronics) on the desk before him. ITN's new studios Wells St. London, Ûe clock are the monitors for telecine a-e :he monitors for engineers con - were officially opened by the Queen on anc video tape recorders. Below the tro ling the quality of the picture. The the 20th of November last year. The transmission monitor are the four 24- chanrel sound mixing and produc ...
... monochrome television system. service is a far more worthwhile improvement than the I look forward to at least two competing colour pro- addition of 50 % , more scanning lines. Therefore it grammes next year, and I am sure that your readers makes commercial, political and engineering sense to do too. add colour to our national (98% coverage) 405 -line ser- Richmond, Surrey. MICHAEL COX vices rather than to the almost moribund 625 -line BBC -2 service. If this is done, a case can be made for putting BBC-2 back to 405 lines, which is easier than might be PAL Co- channel Interference ? thought, or it can be left as a monochrome 625 -line I THINK it advisable to draw attention to a shortcoming service, with no detriment to any one ...
... the peak Peak Buffer Led,a right hand op-amps should not be detect Tr, green illumination could be set for -6dBm, being standard level for much unbalanced audio 13 ,0 R s IC,d 18OR B 58 connected to Headphone ground equipment. 14 1k5 TL074 (centre data) ' as shown, but to the At + 6dBm, the red LED is fully lit. Green input ground at the left-hand side Michael Cox, CEng. FIFE of the circuit diagram. 47k Twickenham Tr 3 D1 11 9 B 8 F81 47 BT 2 PP3 Level dependent inverter R1 2 262 -9V cr'1D-- (F81 ) Sw ib Three-phase sine generator This generator can be used for example to followed by afourth-order low-pass filter to make it possible to achieve aphase-shift of symmetrical around 8(6 count pulses high Outputs Qj of /C2 ...
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