Elenco AM Radio Kit Manuel d'utilisateur Page 1

AM RADIO KITMODEL AM-550KINTEGRAL CIRCUIT, 3 TRANSISTORS, DIODEAssembly and Instruction ManualCopyright © 2007, 1999 Elenco®Electronics, Inc.

-9-ASSEMBLY INSTRUCTIONSWe will begin by installing the speaker. Be careful to properly mount and solder all components. Diodes andelectrolytic cap

-10-ASSEMBLY INSTRUCTIONSDiodeBe sure that the band is inthe correct direction.NPN TransistorFigure GMount so E lead isin the arrow holeand flat side

-11-STATIC MEASUREMENTSRESISTANCE TESTYou have completed wiring the Audio Amplifier. We shall proceed in testing this circuit. You will need for sta

-12-Adjust your VOM to read 9 volts and connect it to test point 7(TP7) as shown in Figure 8.Make sure that the battery, or a 9 volt power supply (if

-13-DYNAMIC MEASUREMENTSFigure 10Connect the oscilloscope and audio generator to yourcircuit as shown in Figure 10.Set the audio generator for a frequ

-14-Measure the maximum voltage peak to peak whenclipping first occurs and record that value here:Vclp = _______ Vpp.The maximum power output before d

-15-The purpose of the detector is to change theamplitude modulated IF signal back to an audiosignal. This is accomplished by a process calleddetecti

-16-ASSEMBLY INSTRUCTIONS - AM DETECTOR AND AGC STAGESR8 - 100Ω 5% 1/4W Resistor(brown-black-brown-gold)T3 - Detector Coil(Black Dot)TP5 - Test Point

-17-Figure 15DYNAMIC MEASUREMENTSTurn the power OFF and connect the VOM and RFgenerator as shown in Figure 15.Set the VOM to accurately read 2 volts D

-18-TP4 - Test Point Pin(see Figure E)T2 - IF Coil(White Dot)Q3 - 2N3904 Transistor NPN(see Figure G)R10 - 470Ω Resistor(yellow-violet-brown-gold)R7 -

-1-PARTS LISTIf you are a student, and any parts are missing or damaged, please see instructor or bookstore.If you purchased this kit from a distribut

-19-Figure 18STATIC MEASUREMENTSWith the power OFF, connect the negative lead of yourVOM to any ground and the positive lead to the emitterof Q3 as sh

-20-R4 - 1MΩ Resistor(brown-black-green-gold)TP2 - Test Point Pin(see Figure E)Q2 - 2N3904 Transistor NPN(see Figure G)R6 - 1kΩ Resistor(brown-black-r

-21-Figure 21STATIC MEASUREMENTSWith the power turned OFF, reconnect your VOM to testpoint 3 (TP3) as shown in Figure 14. Set the VOM toread 2 volts

-22-SECTION 5In a superheterodyne type receiver the radio wave atthe antenna is amplified and then mixed with the localoscillator to produce the inter

-23-ASSEMBLY INSTRUCTIONS - ANTENNA, MIXER AND OSCILLATORL1 - Antenna (see Figure K)C2 - .02μF Discap (203)or .022μF Discap (223)TP1 - Test Point Pin

-24-PC Board StandInsert the PC board into the stand as shown.IMPORTANT: Before installing the antenna coil, determine if you have a 3 wire coil or a

-25-Figure 23Figure 22STATIC MEASUREMENTSWith the power turned OFF, connect the VOM to yourcircuit as shown in Figure 22. Connect a clip lead fromtes

-26-Figure 24Antenna TrimmerOscillator TrimmerAntenna Trimmer3 Leads 4 LeadsFigure 25FINAL ALIGNMENTSWith the power turned OFF, connect the RF generat

-27-Figure 26With the power turned OFF, connect test equipmentto your circuit as shown in Figure 26. Set the RFgenerator at 600kHz, 400Hz 80% modula

-28-DC VoltagesThe voltage readings below should be used in troubleshooting the AM radio.Q1 B 1.5V U1 1 - 1.3VE 1.0V 2 - 0C 8.9V 3 - 04 - 0Q2 B 1.

PARTS IDENTIFICATION-2-RESISTORS CAPACITORS SEMICONDUCTORSResistor50kΩPotentiometerwith SwitchDiscapElectrolyticRadialTuningDiodeTransistorLM-386 ICAn

-29-2. Bend the four flaps upward as shown.1. Start at one edge and carefully remove the baffle fromthe bottom of the kit box. AM-550 Kit CartonAM-550

-30-SCHEMATIC DIAGRAML1REV-A

Elenco®Electronics, Inc.150 Carpenter AvenueWheeling, IL 60090(847) 541-3800Web site: www.elenco.come-mail: [email protected]

-3-IDENTIFYING RESISTOR VALUESUse the following information as a guide in properly identifying the value of resistors.BANDSMETRIC UNITS AND CONVERSION

-4-Figure 1Section 4Section 3 Section 2 Section 1Section 5FIRSTIF AMPLIFIERSECONDIF AMPLIFIERDETECTORAUDIOAMPLIFIERMIXERLOCALOSCILLATORAGCSpeakerINTRO

-5-CONSTRUCTIONIntroductionAssembly of your AM-550 AM Radio Kit will prove to be an exciting project and give you muchsatisfaction and personal achiev

-6-What Good Soldering Looks LikeA good solder connection should be bright, shiny,smooth, and uniformly flowed over all surfaces.Soldering a PC board1

-7-TEST CTEST DHigh ResistanceDiodeLow ResistanceDiodeΩΩCOMΩΩCOMTEST ATEST BLow ResistanceNPNEBCHigh ResistanceNPNEBCΩΩCOMΩΩCOMSEMICONDUCTOR PARTS FAM

-8-SECTION 1AUDIO AMPLIFIERThe purpose of the Audio Amplifier is to increase the audio power to a level sufficient to drive an 8 ohm speaker. To do t