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Schematic diagram | Phase 1: Installation of SMD components | Phase 2: Power supply components |
Phase 3: Micro controller and DAC | Phase 4: Audio frequency amplifier | Phase 5: Receiver; RF and IF |
Phase 6: QR2S |
 
Phase 4: Audio frequency amplifier

Install components in the following order:

Metal film resistors, 1/4W
R64, R76 (47 Ohms), R55 (100 Ohms), R67 (180 Ohms), R62, R74 (1k),
R53, R54, R56, R57, R58, R59, R60, R61, R63, R65, R66, R68, R69, R70, R71, R72, R73, R75 (10k)


Trimmer pot
P2 (500 Ohms)

Ceramic NPO capacitors
C89, C90, C94, C95 (1n)

USM capacitors
C76, C77, C80, C81 (01.u), C91, C96 (0u47)

Electrolytic capacitors
C92, C93, C97, C98 (100u / 25V)

Connectors
J2 (3.5mm, Stereo, PCB)

IC
U9, U10, U11, U12 (NE5532A)

Switch
S1 (DPDT)



Voltage Check

  Pin 1,2,3,5,6,7 Pin 8
U10 6V 12V
U11 6V 12V
U12 6V 12V


 
Phase 3: Receivers' oscillator

Metal film resistors, 1/4W
R28, R29, R51, R52 (100 Ohms), R23, R45 (330 Ohms), R50 (680 Ohms), R25, R47 (1k)
R24, R26, R27, R46, R48, R49 (100k)


Trimmer pot
P1 (500 Ohms)

Ceramic NPO capacitors
C56 (1p5), C87 (4p7), C55 (18p), C86 (22p), C84 (100p), C53 (150p), C54 (220p), C85, C88 (33p)

Ceramic X7R capacitors
C51, C82 (0.1u)

Trimmer capacitors
TC1, TC2 (4-20p)

Electrolytic capacitors
C52, C83 (100u / 25V)

Transistors
Q3, Q4 (2N3904)

Crystals
X6 (8.000 MHz), X5 (18.138MHz)

ICs
U1, U3 (74HC04)

Next phase: Receiver; RF and IF

Schematic diagram | Phase 1: Installation of SMD components | Phase 2: Power supply components |
Phase 3: Micro controller and DAC | Phase 4: Audio frequency amplifier | Phase 5: Receiver; RF and IF |
Phase 6: QR2S |
 

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