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PRACTI CAL DclE:= W == AUDIO SIGNAL GENERATOR ...................... PAINTER CHICUI1 DESIGN www.americanradiohistory.com ,QDCOLPN JACKSON the big name in PRECISION (hogs Trod. Mork) components MINIATURE TUNING CAPACITORS The Jackson '0" range TYPE "00" contains six basic types of different air -dielectric tuning capacitors with a THE RELIABLE wide variation of capacities available in each type. In SOLDERING INSTRUMENT! addition, there are optional extras such as concentric - spindle slow- motion drives, built -in trimmers and plastic covers. The maximum capacitance per section ranges from 12, 18 or 24 pF for FM types to 420 pF for AM types. * Type 00 miniature twin capacitor at 12/6 each * Type OFM two -gang for FM at 12/9 each * Type O two -gang for AM at 12/9 each Write for literature JACKSON BROS. (LONDON) LTD. (Dept. P.W.) KINGSWAY- WADDON, CROYDON, CR9 4DG Phone Croydon 2754 -5 (01 -688) Grams: Walfilco, Croydon U.S. Office: -M. SWEDGAL 258 Broadway, New York. N.Y. 10007 PHOTOELECTRIC KIT CONTENTS: 2 P.C. Chassis Boards, Chemicals, Etching Manual, Infra -Red Photo - transistor, Latching Relay, 2 Transistors, Condensers, Resistors, Gain Control, Terminal Block, Elegant Case, Screws, etc. In tact everything you need to build a Steady -Light Photo -Switch /Counter /Burglar Alarm, etc. (Project N. 1) which can be modified for modulated -light operation. 4 .. PHOTOELECTRIC KIT 12 39/6 - -. Postage and Pack. 2/6 (UK) PMOTOE1LEC7 OIL Commonwealth: LL SURFACE INVISIBLE 11(0.1.4 rre() MAIL 3/6 AIR MAIL £1.0.0 SEND COUPON FOR LATESTLEAFLE7 Australia, New Zealand S. Africa, Canada and U.S.A. Also Essential Data Circuits ADCOLA PRODUCTS LTD `t and Plans for Building pr / 10 Advanced Designs ADCOLA HOUSE INVISIBLE BEAM OPTICAL KIT Everything needed (except plywood) for building: 1 Invisible -Beam Projector and 1 Photocell Receiver (aa illustrated). Suitable for all Photoelectric Burglar Alarma, GAUDEN ROAD Counters, Door Openers, etc. CONTENTS: 2 lenses, 2 mirrors, 2 45- degree wooden blocks, Infra -red filter, projector LONDON SW4 lamp holder, building plans, performance data, etc. Price 19/6. Postage and Pack. 1/6 (U K.). Commonwealth: Surface Mail 2 / -; Air Mail 8/ -. LONG RANGE 9 INVISIBLE BEAM OPTICAL KIT CONTENTS: As above. Twice the range of standard kit. Larger Lenses, Filter, etc. Price 2918. Postage and Pack. 1/6 (U.K.). Commonwealth: Surface Mail 2/6; NAME Air Mail 10/-. JUNIOR PHOTOELECTRIC KIT ADDRESS Versatile Invisible -beam. Relay -less, Steady -light Photo -Switch, Burglar Alarm, Door Opener, Counter, etc., for the Experimenter. CONTENTS: Infra -Red Sensitive Phototransistor, 3 Transistors, Chassis, Plastic Case, Resistors, Screws, etc. Full Size Plans, Instructions, Data Sheet "10 Advanced Photoelectric Designs ". Price 19/8. Postage and Pack. 1/6 (U.K.). Commonwealth 2/ -; Air Mail 4/ -. JUNIOR OPTICAL KIT CONTENTS: 2 Lenses, Infra -red Filter, Lampholder, Bracket, Plans, etc. Every- thing (except plywood) to build 1 miniature invisible beam projector and photocell receiver for use with Junior Photoelectric Kit. PW174 Price 10/8. Post and Pack. 1/6 (U.K.). Commonwealth: Surface Mail 2/ -; Air Mail 4/-. L YORK ELECTRICS 333 YORK ROAD, LONDON, S.W.11 Send a S.A.E. for full details, a brief description and Photographs of all Kits and all 52 Radio, Electronic and Photoelectric Projects Assembled. www.americanradiohistory.com :i:. IE3r' FITTEDs WITH AMAZING VALUE AD -309K PICK -UP ARM AD -76K CARTRIDGE This new AUDIO DEVELOPMENT precision counterbalanced pick -up arm -ready fitted with the outstanding AD -78K magnetic cartridge-offers a truly remarkable breakthrough in quality and value for the 111-Fl enthusiast. The arm is constructed of braes throughout, heavily chrome plated; uses needle and miniature ball race bearings; both coarse and fine balance adjustment is provided. The fixed head has standard lin. mounting centres and is finished in black enamel with chrome lifting handle. Tech. details: Overall length 285mm; needle to pivot length 223mm; offset angle 24 °; overhang 10mm. Requires single 'in. dia. mounting hole. Completely wired, with all fixing note and washers. Arm rest also supplied. BRIEF DETAILS OF AD -75K. Magnetic cartridges: 111gh compliance with etereo diamond LP stylus/ Output 5mV, frequency reop000e: 20- 20KHz, tracking weight .2 grammes. LASKY'S PRICE £9.19.6 Post 5/- I .KK METER KITS ANOTHER LASKY'S These two meter kits EXCLUSIVE by TMK offer both the professional, electronics hobbyist and student Lion. The highest quality components and 1% tolerance resistors are used throughout the unique opportunity of building a really tiret -class precision multimeter at a worthwhile saving in coat. The impact resistant bakelite cabinets are supplied with the meter scale and Both offer professional standards of accuracy. Supplied complete In every detail with lull movemo , mounted in position; the model 200 also has the rotary range selector in posi- constructional, circuit and operating instructions. MODEL 200 20,000 O.P.V. Multimeter. Fea- 0-0.8-8-30-120-600-1200V tures 24 measurement ranges with SPECIFICATION ACV 0-8-30-120-800.1200V OK OPV DC. Large 3 x 21n. meter. Full scale accuracy: DCV /KS and Current: 0- 0.08- 6- 60- 600mA. Resistance: 0.10K- 100K- 1M -10M ohme (58.680.55K -58K at escale.nt: }2 %, ACV: ± 3%, resistance ±3 %. Special 0.8V DC mid- scale). Capacitance: 0. 002 -0.20? (AC 8V range). Decibels -20 to +83dB. Output: range for translator circuit measurements. 0.06uí blocking capacitor. Uses two 1.6V (U.7 type) batteries. Black batelite cabinet -Size 2) x 35 x 111n. Complete with test leads. LASKY'S PRICE 85/- Post 3/8 I MODEL 5025 50,000 O.P.V. DEfl5HE BOARD airs FEATURING 57 MEASUREMENT RANGES NEW EXPERIMENTAL A highly rehab a natrument using an entirely new range selection mechanism which permits AND EDUCATIONAL CIRCUIT the use of a really large meter in a more compact cabinet. The range selected is clearly indicated on the actual meter tace facilitating Instant SYSTEM identification without taking your eyes from The DENSHI BOARD system enables the meter. High speed rotary range selection knob; also features polarity reversal switch, the young experimenter and elec- shielded meter movement with overload pro- tronics hobbyist to produce a wide tection circuit; Special nA and mA measure- range of transistor circuits of increas- ment ranges. ing sophistication-without soldering or the use of any tools SPECIFICATION DOT: 0- 026 -2.6- 10.56- 200.1,00017 at 26K /OPV. 0.0122: at all! Basically 1.25- 6.0 -26. 125 -000V at 6OK /OPV. ACV: 0-3- 10.60.260- 1,000V at 2.6K/OPV, 0 -1.5. the system comprise. a slotted circuit 6 -26. 126-500V at 6K /OPV. DCuA: 0.26uA at 125mA: 0-60uA at 260mA. DCmA: board into which plug -In components 0.2.5.26.260mA at 126mV 0- 5.60 -600mA at 260mV, DC Amps: 0.SA at 126mV; and bridge pieces a're set to produce up 0.10A at 260mV. Resistance: 0.10M /ohms (13, 86, 860, 8.6K and 86K /ohms at centre to 30 different scale). Output: Capacitor circuits. The com- (0.1aF, 400VW) In series with ACV ranges. Decibels. ponents are incapsuiated -20 to +81.6dB in 10 ranges. Operates on two 1.5V (U.7 type batteries). Black bake- in trams- Ste cabinet, else 55 x 85 s 21 in. Strong, resilient plastic handle. Complete with test leads. parent plastic blocks bearing the appropriate circuit symbol and value THESE ARE JUST A FEW OF THE thus enabling even the complete CIRCUITS YOU CAN BUILD IN LASKY'S PRICE £10.10.0 Post 5/- novice to visually grasp the funda- MINUTES: ALSO AVAILABLE READY BUILT AND TESTED 513.10.0. Poet 5/ -. mentais of circuitry after only a few VARIOUS RADIO RECEIVERS, AMP - i moments study. In addition each LIFIERS, MORSE CODE PRACTICE DENSE! BOARD KIT comes tom- DEVICE, CONTINUITY TESTER, plate with an SO page manual of SIGNAL INJECTOR, SIGNAL TRACER, q ti saits and data. WIRELESS MICROPHONE ETC., ETC. DENSHI BOARD KIT SR- 1Ae.mprfse: SP25 Mkil Base board; tuner block; 4 resistors; choke coil; transformer; 28A transistor for RF; 2 diodes; 3 capacitors; battery block; morne key; antenna lead; crystal earphone; various bridge and connecting pieces and 80 page manual. This kit permits the building of 16 basic circuits. LASKY'S l'est 3/6 PRICE £11.19.6 I LASKY'S PRICE £4.19.6 Post 3/8 I DENSHI BOARD KIT SR -2A ADTOCHANGERS cartridge ae SR-1A Ma sell. Ms following additional para; .. .. 881.10.0 28B translator for AP; 2 resistors; 1 capacitor; 1026 leas cartridge .. 281.8 crystal microphone; teat probes; electrode AP76 less cartridge . 218.10.0 additional connecting pieces; 1086 with 0CM21 mono cart- 9V battery. This kit permits the building of 80 basic circuits ridge. Stereo compat. 28.19.6 SRP22 Mains model less cart- 8026TO with GCM21 a ono 116.12.10 cartridge. Stereo compat. 87.19.8 8ßP82 Battery model less LASKY'S PRICE £7.2.6 Post2/6 8L66 with ¡2008 stereo cartridge 111.19.8 cartridge .. 27.12.3 /L85 less cartridge .. .. 114.16.0 TRANSCRIPTION DECKS 1 EL76 lees cartridge .. .. 128.10.0 228.10.0 111.95 less cartridge 236.0.0 GARRARD BASES I GET YOUR LASKY'S AUDIO- TRONICS PICTORIAL A70 Mk II less cartridge .. 518.19.6 WBl 28.6.11; WB4 Mk II 15.8.11; WH5 16 colour page catalogue in large 16 x !lin. format packed with 1,000's of Items I AT 60 Mk II .. .. 218.6.0 25.8.11. from our vast stocks. HI-Pi, Radio, Electronics, Test Equipment, Components BAR 0A47 (ese cartridge .