radio electronics magazine 04 april 1983

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Theline of professionsoldering stations that gives accurateemperature control all thetime!TheEC1000, 2000, 3000,4000 soldering stationsrespondautomatically to soldering toad-variations andmaintain the temperature you select to within10F.LED read-out on theEC2000 and 4000 displaysactualtip temperature witha 1F resolution86A".HAll99 ..a 5 TKO)2'"

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,"TA7203 P '30 UPCl155H'"AI'".. B' "'"CUll'"CI1128," CI885,."'''' " ' "1,18&119 O. TA7204 P'"UPCll 56H t eA162 .., 86 11",,.gJ::"Cl11)"C" ..,. 0 461"8 Al ) 10,,.PLl O1A ' 56T...,205AP , 2QID3D2Q2Q2D2D3Q\Q3DID4ENQ4 STGNDCLFIG. 2dothat is toput some-hold-and-followlatchesthereandusethemtoremembertheenterednumbers.Figure :2 shows thepinout of exac tlywhat weneed- a4508 hold-and-followlatch that has the added bonus of Tri-Stateoutputs . It' s dua l 4-bit latch, andeachhalf of theIC can be usedindependentl yof the other. TheEN (enab le) pin controlsthe outputs, and bringing it high put sthem into a high-impedance state withouthaving anyaffec t on the opera tion of thelatch itself. The ST (store) pin controls theloading of the latch . If it' s held high, thelatch is transparent , but taking it low wi llA databusLet' s now turn our attention to the databus-or rather the lack of one. So far. ourencoder displaysentered digits, but thedata isn' t available to us for use. That's aserious probl em- since we want moreout of this exercise in circuit designthanan elaboratedo-nothing box, a real data-bus is a must. At themoment , datafromthe keyboard goesdirect ly to the displaycircuitry . What wehaveto dois changethat so that the display showswhateverison thedatabus. Thatmeanswehavetoput somestorage space betweentheen-coderand the displ ay. The easiest waytoSPKR8.fl.+rJ

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