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Page 2 of 16                                      ft8_II_assy_smd_diode_072020.pdf 

 

Q1, Q2, Q4, Q6, Q7, Q8 

6 

BS170 

TO-92 MOSFET 

Q3, Q9 

2 

2N3904 

TO-92 NPN 

Q5 

1 

2N3906 

TO-92 PNP 

 

 

 

 

R11, R20 

2 

5.6 OHMS 

GRN/BLUE/GOLD/GLD 

R1 

1 

51 OHMS 

GRN/BRN/BLK/GLD 

R10, R19 

2 

470 OHMS 

YEL/VIO/BRN/GLD 

R4, R9, R18, R21 

4 

1K 

BRN/BLK/RED/GLD 

R5 

1 

4.7K 

YEL/VIO/RED/GLD 

R2, R3, R12, R16, R17 

5 

10K 

BRN/BLK/ORG/GLD 

R14 

1 

47K 

YEL/VIO/ORG/GLD 

R6, R8 

2 

100K 

BRN/BLK/YEL/GLD 

R13 

1 

470K 

YEL/VIO/YEL/GLD 

R15 

1 

680K 

BLUE/GRY/YEL/GLD 

R7 

1 

1 MEG 

BRN/BLK/GRN/GLD 

 

 

 

 

U1 

1 

SA602 or SA612A 

SO8 MIXER/OSC 

U2 

1 

LM358 

DIP8 DUAL OPAMP 

U3 

1 

LM7809 

TO-220 9V/1A REG 

V1, V2 

2 

2K  

6mm Trimmer resistor 

T1, T2 

2 

FT37-43 

FERITE CORE, BLACK  

DIP SOCKET 

1 

8 PIN DIP SOCKET 

 

PCB 

1 

MAIN CIRCUT BOARD 

 

Screw 

1 

4-40   1/4” 

 

Nut 

1 

4-40 nut 

 

FEET 

4 

RUBBER FEET 

 

TEST pins 

1 

2 position SIP pin strip 

 

 

1 

Jumper (Berg connector)  

 

 

BAND PARTS, SEE TABLE  

QUANITIY  

VALUE 

 

CAPACITORS 

6 

22 pF – marked 22 or 220 

C0G 

 

1 

33 pF – marked 33 or 330 

C0G 

 

1 

47 pF – marked 47 or 470 

C0G 

 

1 

68 pF – marked 68 or 680 

COG 

 

3 

100 pF – marked 101 

C0G 

 

2 

150 pF – marked 151 

C0G 

 

2 

220 pF – marked 221 

C0G 

 

3 

330 pF  - marked 331 

C0G 

 

1 

560 pF – marked 561 

C0G 

 

1 

680 pF – marked 681 

C0G 

 

Содержание Digital DSB II Transceiver Kit

Страница 1: ...ts List Location Quantity value Type C1 C2 C10 C13 C16 5 10 nF 103 X7R MMLC C3 C7 2 100 uF electrolytic 16V Long lead plus C4 C5 C6 C8 C9 C12 C14 C15 C18 C19 C20 C22 12 100 nF 104 X7R MMLC C11 C17 C21...

Страница 2: ...MEG BRN BLK GRN GLD U1 1 SA602 or SA612A SO8 MIXER OSC U2 1 LM358 DIP8 DUAL OPAMP U3 1 LM7809 TO 220 9V 1A REG V1 V2 2 2K 6mm Trimmer resistor T1 T2 2 FT37 43 FERITE CORE BLACK DIP SOCKET 1 8 PIN DIP...

Страница 3: ...2 uH RED RED GLD GLD or RED RED GLD SIL 4 T37 2 RED CORES 2 T37 6 YELLOW CORES crystals 1 7 074 MHz HC 49 US 1 10 136 MHz HC 49 US 1 14 074 MHz HC 49 US Miscellaneous 3 Band module boards 12 1 26 magn...

Страница 4: ...ite smd soldering method or we have found the process below to be quite satisfactory Solder U1 the SA602 612 smd component first by wiping a thin layer of flux on the board position the chip carefully...

Страница 5: ...1 R20 5 6 GRN BLU GLD GLD R13 470K YEL VOL YEL GLD R14 47K YEL VOL ORG GLD R15 680K BLU GRY YEL GLD L4 10 uH BRN BLK BLK GLD or BRN BLK BLK SIL D1 1N5817 Black plastic body D2 D3 1N4148 Small Glass bo...

Страница 6: ...t of the board Make U shaped pieces of resistor lead clippings to hold the body of the BS170 s to the board using the small holes on either side of the package D4 CLEAR LENS RED LED the short lead goe...

Страница 7: ...three band modules and detailed the values for 20 30 40m Additional bare band module pcb s are available for operation on other bands At the end of this document we have modeled additional band compo...

Страница 8: ...L2 20 turns on T37 2 RED core make sure turns are snug to the core and more or less evenly spaced around the core Loose winding does not work well L3 18 turns on T37 2 RED core X1 7 074 MHz crystal I...

Страница 9: ...top of the board centered on the silkscreen outline Secure each toroid to the pcb using two of the supplied plastic zip ties as shown below Be sure to tin the wire ends before installing The transceiv...

Страница 10: ...card output level until the board switches into Transmit RED LED goes on you can continue to increase the output level a little bit to ensure reliable triggering of the VOX circuit If you have a watt...

Страница 11: ...card to the mixer input This allows you to set the audio output from the sound card to a reasonable level and not overdrive the mixer The other half of the LM358 U2a is used as a VOX circuit The peak...

Страница 12: ...nd your meter Only be concerned if the voltages are significantly different than those shown Almost all of the construction issues with the DSB transceiver have been traced to the faulty installation...

Страница 13: ...Drain G Gate S Source E Emitter B Base C Collector I Input G Ground O Output Pin 1 2 3 4 5 6 7 8 U1 1 42 1 42 0 7 15 7 15 8 3 7 5 8 35 U2 Rx 0 0 0 0 4 5 4 5 4 5 9 Rx D C G B S E Tx D C G B S E Q1 0V...

Страница 14: ...Page 14 of 16 ft8_II_assy_smd_diode_072020 pdf...

Страница 15: ...Page 15 of 16 ft8_II_assy_smd_diode_072020 pdf...

Страница 16: ...___________________ _________________________________________________ _________________________________________________ _________________________________________________ ______________________________...

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