[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-562931-105":59,"doc-detail-562931-en":124},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":117,"head_meta":119,"extra_data":121,"updated_unix":123},105,"en","transistor-and-fet-curve-tracer-circuit-description-uses-and-operation","Transistor and FET Curve Tracer - Circuit Description - Uses and Operation","","Adapter design enables displaying transistor or FET characteristic curves on a conventional oscilloscope using a continuously sweeping collector voltage and a staircase-driven base current. The circuit supplies a proper polarity sweep to the collector while stepping base current so each step traces a line in the family of curves. The description explains the sweep and staircase relationship, temperature effects, and practical measurements such as AC/DC beta, saturation voltage, breakdown voltage, leakage, dynamic output resistance, and diode E vs I curves.",{"@graph":69,"@context":116},[70,84,99],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/transistor-and-fet-curve-tracer-circuit-description-uses-and-operation/562931/",{"url":83,"name":65,"@type":85,"author":86,"headline":65,"publisher":89,"fileFormat":92,"inLanguage":63,"description":67,"dateModified":93,"datePublished":93,"encodingFormat":92,"isAccessibleForFree":94,"interactionStatistic":95},"DigitalDocument",{"name":87,"@type":88},"acoobca","Person",{"url":74,"name":90,"@type":91},"DocShare","Organization","application/pdf","2026-10-12",true,{"@type":96,"interactionType":97,"userInteractionCount":4},"InteractionCounter",{"@type":98},"ViewAction",{"@type":100,"mainEntity":101},"FAQPage",[102,108,112],{"name":103,"@type":104,"acceptedAnswer":105},"How does the adapter create the family of characteristic curves on an oscilloscope?","Question",{"text":106,"@type":107},"It applies a continuously sweeping voltage of the proper polarity to the transistor collector while a staircase waveform is fed to the base through a resistor. Each staircase step traces one line in the characteristic curve family.","Answer",{"name":109,"@type":104,"acceptedAnswer":110},"Why are manufacturer data-sheet transistor curves sometimes limited?",{"text":111,"@type":107},"Because transistor characteristics can vary by a factor of three to four between units, and temperature changes can also significantly shift the characteristics, especially for germanium types.",{"name":113,"@type":104,"acceptedAnswer":114},"What key parameters can be determined using the curve tracer display?",{"text":115,"@type":107},"The document lists AC β and DC β, collector-to-emitter saturation voltage, collector breakdown voltage (up to 35 V), dynamic collector output resistance, leakage, and other observations such as diode E vs I behavior and selective transistor matching.","https://schema.org",{"og:url":83,"og:type":118,"og:title":65,"og:site_name":90,"og:description":67},"article",{"robots":120,"canonical":83},"index,follow",{"doc_id":122,"site_id":62},562931,1791810096,{"code":4,"msg":5,"data":125},{"doc_id":122,"user_id":126,"nickname":87,"user_avatar":127,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":128,"file_id":129,"file_url":130,"file_type":131,"file_size":132,"view_count":4,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":81,"language":133,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":134,"faqs":135,"seo_title":136,"seo_description":67,"update_tm":123,"read_time":39},3985747870733,"https://ap-avatar.wpscdn.com/davatar_a8503ba1806abce46bf441b54a3ca4cd","Transistor andFET Curve Tracer  \nDesign of an adapter that permits you todisplay the characteristic curves of anytransistor or FET on conventional scope.By DANIEL METZGERAsst.Proffor Electronics TechnologyMonroe County Community College,MichiganCurve tracer adapter being used toproduce family of curves on scope.  \nAIOTHING provides more information about a transistorNthan its family of collector characteristic curves.Typi-cal characteristic curves are often given in manufacturers'data sheets,but these are of limited value because transis-tor.characteristics may vary by as much as a factor of threeor four either way from unit to unit.Temperature varia-tions also cause considerable change in transistor character-istics,especially with germanium types.The adapter to be described will allow you to obtain an  \nR1—330 ohm,  W res.R2—500,000 ohm pot(\"Stability control)  \nR3,R21—10,000 ohm,Y W res.R4—100 ohm trimmer(\"1-V Step Adj.\")R5—33 ohm,Y W res.  \nR6—10,000 ohm trimmer(\"No.of Steps\")  \nR7,R18—1000 ohm,Y W res.R8—1800 ohm, W res.R9—1000 ohm trimmer('Step-Position\"control)R10—47 ohm,Y W res.R11—470 ohm,1 W res.R12—2700 ohm,  W res.R13—100 ohm,10W res.  \nR14,R16,R17,R24—100,000 ohm,Y W res.R15—25,000 ohm,X W res.  \n(selected,see text)  \nR19—2000 ohm,Y W res.(selected)R20—5000 ohm,Y W res.(selected)R22—20,000 ohm,W res.(selected)R23—50,000 ohm,Y W res.(selected)R25—200,000 ohm,Y W res.(selected)R26—500,000 ohm,/W res.(selected)R27—500 ohm,2 W pot  \n(\"Ec(max.)\"control)  \nC1—0.05μF,200 V ceramic capacitorC2—0.2μF,200V Mylar capacitor  \nC3,C4—300μF,25Velec.capacitorC5—500μF,25V elec.capacitor  \nS1—2-deck,4-pole,5-pos.selector sw.  \n(3.poles,4 pos.used)Centralab PA-1013 or equiv.  \nS2—S.p.3-pos.selector sw.(Centralab 1461 or equiv.)  \nS3—2 deck,11-pos.selector sw.(Centra-  \nlab PA-1005 or equiv.)  \nS4,S5—S.p.s.t.toggle sw.  \nimmediate display of the characteristic curves of any tran-sistor or FET on a conventional oscilloscope.The followingare some of the uses to which the curve tracer can be put:  \n● Determine the a.c.and d.c.beta,collector-to-emittersaturation voltage,collector breakdown voltage(up to 35volts),and dynamic collector output resistance of a transis-  \n● Observe the effects of temperature on transistor chaacteristics,either by applying heat externally or overbia  \nFig.1.Schematic of tracer.Q1,Q2,and Q3 comprise staircase generator,whileQ4 and Q5 form Darlington emitter-follower providing current to drive the baseof the test transistor.Collector sweep voltage comes from D7-D10 full-wave bridge.  \nT1—Transformer:117V pri.;three 12-Vsec.at 0.1 A each (Stancor P-8351)D1-D10—Silicon diode,100.p.i.v.(1N628or equiv.)  \nQ1,Q3—2N1671 unijunction transistor  \nQ2—2N3638\"p-n-p\"silicon transistor  \nQ4,Q5—2N3569“n-p-n”silicon transistor  \ning the transistor and allowing it to generate its own heat.  \n●Observe the base-emitter input characteristics of atransistor.  \n● Observe the E vs I curves of diodes,zener regulators,and photocells.  \n● Selectively match transistors on input or output char-acteristics.  \n●Spot transistors with low breakdown or high saturationvoltages as well as those with low beta or high leakage;thefirst two tests are usually not available on meter-type tran-sistor testers.  \n# Circuit Description\n\nThe basic function of the adapter is to supply a continu-ously sweeping voltage of the proper polarity to the collec-tor of the transistor under test,while a staircase waveformis fed through a resistor to the base to produce the“steps”of base current.A different line in the family of curves istraced at each step of the staircase.For simplicity thesweeping voltage is an unfiltered,full-wave rectified 60-Hzsine wave obtained from TI(Fig.1).Fig.3 shows the rela-tionship of the collector sweeping voltage to the base driv-ing voltage.Although they are shown in synchronism,there.no particular need to keep them in step,since the locus ofpoints created by the two voltages will be the same forpractically any staircase repetition ra","cbCaiuWmkSgJ5hho","https://ap.wps.com/l/cbCaiuWmkSgJ5hho","pdf",2216012,"English","# Circuit Description\n## Basic function and waveform generation\n## Uses and measurable transistor parameters\n## Display scaling and example readings","[{\"question\":\"How does the adapter create the family of characteristic curves on an oscilloscope?\",\"answer\":\"It applies a continuously sweeping voltage of the proper polarity to the transistor collector while a staircase waveform is fed to the base through a resistor. Each staircase step traces one line in the characteristic curve family.\"},{\"question\":\"Why are manufacturer data-sheet transistor curves sometimes limited?\",\"answer\":\"Because transistor characteristics can vary by a factor of three to four between units, and temperature changes can also significantly shift the characteristics, especially for germanium types.\"},{\"question\":\"What key parameters can be determined using the curve tracer display?\",\"answer\":\"The document lists AC β and DC β, collector-to-emitter saturation voltage, collector breakdown voltage (up to 35 V), dynamic collector output resistance, leakage, and other observations such as diode E vs I behavior and selective transistor matching.\"}]","Transistor and FET Curve Tracer - Circuit Description - Uses and Operation | PDF"]