Popular Electronics Heterodyne Detector

Parts List

SEMICONDUCTORS
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IC1        567 phase-locked loop, integrated circuit
U1         LM386 audio power amplifier, ic
Q1, Q2     2N391M NPN transistor
Q3         MPF102 JFET transistor
    
RESISTORS
(All fixed resistors are 1/4 watt, 5% units.)
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R1, R2        220,000 ohm
R3-R6         2,200 ohm
R7            1,000 ohm
RS, R14       270 ohm
R9            100,000 ohm
R10           4,700 ohm
R11           10,000 ohm
R12           50,000 ohm, potentiometer
R13           10,000 ohm, potentiometer

CAPACITORS 
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C1, C2, C5        0.01 microF, Mylar
C3                0.047 microF, Mylar
C4                0.0022 microF. Mylar
C6, C7, C11, C12  0.1 microF, ceramic-disc
C8                10 microF, 16 WVDC, electrolytic
C9                47 microF, 16 WVDC, electrolytic
C10               470 microF 16 WVDC, electrolytic
 
ADDITIONAL PARTS AND MATERIALS 
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SG1               Piezo tweeter (Ultrasound receiver)
    
Power source, headphones or speaker, wire, solder.