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Up-to-date electronics for lab -andeisure” Tao E: fesdedia == -circuits November 1976 40p [elektor decoder 'ELeRTOr | =. Editor W. van der Horst | Deputy editor : P. Holmes Technical editors : 4, Barendracht GH. Dam E Krempelsauor ISSUES ARE STILL AVAILABLE This is a selection from che contents af the alber Albar is an ultrasonic movement detector, based on the Doppler effect. It uses only one ultra- sonic transducer as both transmitter and receiver. The circuit can be used as the basis of a burglar alarm, which could prove well worth the cost. t can also be used as a modern game of skill. The article also contains proposals for more elaborate alarm equipment. Ja several advantage tm” olher topar gpa 4 q ad a as imquied, Moweer, 1 mol de Hugo nt at to toras à ve of avadablo alas, meto 10 puedo e or a price “oa also ba, and Mel FT abc ta inn a recem ar mono reaiv da one anus Tre rot De ul ças Tim tio dese crê enumera applicable Ta SoMeve a nela ra, a bits oco imita amp 4 ma 15 The Soa! a te coletor UU 15 e el ndo cone 1 the INA14S diodas ami e (back 4 bas 01 ES bis am an eo or e ar, TR ala may e doxl by setehane 06 he ponte polo Sucre far er rates and, Untontamatel, q Ancora Seen dh lo POWER SUPPLY SENSITIVEJMEAU DETECVOR Several readers have asked us to design a good metal detector. When our “research and development” group took a closer look at the problem, they soon discovered why: most conventional designs are not really suitable for the home constructor! In most designs, extreme care must be taken to screen the various sections of the circuit from one another and the power supply must be carefully filtered A different design approach was chosen for the circuit described here. With a little care, the average home constructor should be able to build a highly sensitive metal detector, which will be suitable for a wide variety of uses. The nocmal Way to Gonstrct à metal | Crises à “het Iraguency 1a sppe deelir 5 lave Lo Eniataa mode ter a mel object o brovebi | a heity em É metal is requised to o Jão wie 1 de pickup colhe | am aii imticatim icaueney ol tãe VFO val chance Tais | À furber problem E tost te col 4 determine Lhe iequeney of Aa fe a dam e É mejor problem, bles tan te esse CT) ve e nom der 45. ale Tl upa pu a o pu RE NL 25.5 fz This sinal Ras a spectrum sich extends we iso te megaety str 4, CIT, CIR ama He frequenoy det mining componenss Cf and Le, the Es TE seiiates ad ve NR Tredutiy. Asi cr, É E tea cat eme hr ur os 3 ne ismeter form, the ioqueney cam be Ts ia! s Ee to che mei, tcougl a bos stag (19, The usp Hom ave nar io deter oe hein, Tre ma, Nó. Name to vote e a “Hxod frequency reerence! sind a rea Pes een SE the VFO. Tas hs tão sede av many Spike ja the feferense speotuar Hat amos ay od e, ore De done” and Sol vero EA o. Tie sol diameter wi read, ==r'o 4. Schmitz Relatively few components are used in this eggtimer. The “boiling time” is automatically determined according to the size of the egg and the degree of hardness required. pin de pn ue did fat near ” en io OE a le encug Rr at e drops to zero. There às no nec for & roi under poster and LED SW UMES isa The washing machine starts to leak while you're watching TV... Or the freezer fails and you don't notice it for adayortwo... Or the children turn on the taps in the bath and leave them running - In all these cases, and many more, some form of Domestic Early Warning System (DEW line) can prevent more or less serious consequences. What is required is a system that will monitor various vital points throughout the house and give timely warning if anything goes wrong. A very simple alarm line is described here. da api 9€ is extreme semp, tis ala syatr prove ut acoduate Te lan line puoger consists of a | Ta tai ate, air seres for water coin leme Iecocro cet é desprezam mil be do. Bier Choo note quins bla o beo: | senbedo ho tfeipecacr alarm deseibed are Tee cab cam be tua The | aiehee im tha ia Adtenarvey, amy or al o ese sensor Cam be connected into. ho orginal "ie el Entender cien (ler house Y õ Freeze alarm the Est “dorme cale senso to e desripod Br ani lt prudutes an reruluç Id e trees oo e dane ave out RE ai Je ota do Sigur 1. Oaiy à single COSMOS itepate cit and É Go hattadozen artes componente Soeing a intento “epi Ava ds lhe tempetetue ol Ie NTC desalento lo, ie Bust Blake am. the Gupur it CR tempero ss gone a certi Boat, Ch restante ag ta NTC drops Seen far to enable he ste mu “ibrato soundine o arm. Th tea Tesktane 08 tão NTO o hs NTC must de Conaeste o he est GE th circiva lin alas vie Flood warning. “The cio for lhe Llooé are (ice vens Lhe grega o Aa dao, gates NI ama N2 produce a lom di me a a tono sia | PESE nto The DEM line. Tm the (0% Baias] cm e cimcie o tis Summer Creio (br LS/1G) Sn ram pol alone let a “pa onde rs desibd, inlod | gue 4 Th dr So an ae im Ile bel pe. Th oo. | mt ae E TE a mit Cosan qe sm mc o pe | EB be Eae nt he ala str | un in “ip ot audi roccenitim. a other men, te sophsaica sound reco. | [7 ate system e po 07 humar eia 6 sd dE par Of [ne alurm o Ro more epi, the ac so Ga pede a terem eine omelhine goes cer T Eonmeçte tu he Iron cable, The edad audio apr. As conm ie re lt [E “a Eme Lie ma nm! corta Pa à am o “hot some E p to discineuish 1 o n 4 É u É EA ; dm tão bach sopra CRT e o Ee re al = dh renenãa ar” aná E e a De ain mora do sn Thee | » os ue GS Telephone bell extender pu TE Na SH) Mv E esta ampli huonls he era! che DEV nc cajtage. am lhe DIS al pt up to The recair dor Ao sa a Cf po io. | NE or no neem x ns beca mede to to use oniy one af “eh one (or more) Be coemel ie to she input me | ima de Tre é eim o nro a e a CAUENDAR R. ter Mijtelen A circuit for producing a calendar display using the pulses from a digital clock has already been described in Elektor 8, This design provides an alternative circuit which gives day, date and month display, plus flashing display facility to draw attention to dates of particular interest. The calcado à adsaneed by the The nte ôndicadom is by a sau ot (e, emdngat putes from a digital | Tacgmemt Uni, de the dy apl e 9 io dade ectanenar td lay-out Ts the tom psael shoa a ir Day of the week display Fio 1 tos th edeeuit datam tor | qa Dieese cl 5 fd, va a doconpnne e E nba gos Mi e pa pt 3, tn Bt BC de EG O e pu CI 748) e E seven (BOB LIS Re pe a a irei to provide a dahuoe Esplay to | mp ol em ash ano a sec Dato display The Cate dpi cieail je show im O muipato i Hot PIS mi EF fe die O output ous to po By counter Asse, te date mus De “one not do-yfovr oouner Rat ato, he cost or No: Na ue a hã Ha the cut LN ln The Gutpulo of NS and elftetom PFL, PES and PS Sai, he tee Sal to FR, FPS al comes. from N53 Eee E one ot them ig e gm tor te ds ar El Month display The mnt dp ue 6 isthe same SE de dy do, ee to e circd by É momentrdy. Tri resete 
