Bill of Material for D:\PROJECTS 2025\IC-705_BT_TTGO_\BT_ANT_DECODE\temp_ RELAYS\BNC_switched\DECODE_BNC_SW.Sch

BOM for the VK3PE IC-705 BlueTooth antenna switcher board. V1.1
Jan 11th 2026 , minor updates Mar 12th.

Used Part Type        Designator           Footprint        Description                                
==== ================ ==================== ================ ========================================== 
2    0R               R16 R17              1206-0805                                                   
4    100nF            C1 C2 C66 C777       1206-0805                                                   
10   10k              R10 R11 R144 R155    1206-0805                                                   
                      R22 R33 R6 R7 R8 R9                                                              
6    10nF             C10 C5 C6 C7 C8 C9   1206-0805                                                   
4    120R             R12 R13 R14 R15      1206-0805      relay 'dropper' resistor (12v Ant. relays) So relays run on slightly lower voltage.                                            
5    1K               R1 R2 R3 R4 R5       1206-0805                                                   
6    1N400X           D1 D2 D3 D4 D5 D6    DIODE12          most any 1n4000 series oK.                                           
1    1uF/10V          C4                   RB.1/.2          polarized cap                              
2    4 HEADER         J1A J7               SIP4             header strip 0.1" pitch.                                          
1    47uF/25V         C3                   RB.1/.2          polarized cap                              
1    7805             U1                   TO-220           Requires HEATSINK(home made)                                           
5    AOH3106          Q1 Q2 Q3 Q4 Q5       SOT-223          MOSFET N   any similar N-CH fet ok.                                
5    BNC_DUALFP_SLOTS J12 J2 J3 J4 J5      BNC_DUALFP_SLOTS Most right-angle BNC sockets should fit slotted PCB                                          
1    ESP32 TTGO       U2                   DIP24-W          ESP32 TTGO   Aliexpress etc.                              
2    HEADER 10        J55 J6               SIP10            all 0.1" male header strips, cut to length.                                           
5    HEADER 2         J11 J33 J8 J88 J9    SIP2             J33 not fitted.                                           
2    HEADER 3         J13 J77              SIP3                                                        
1    HEADER 4         J1                   SIP4                                                        
1    HEADER 8         J10                  sip8      
2    2 pin header link  ie Socket                           Fit on J77 12v end and J13 12v end.   Can use 5v relays, see Sch.         
5    LED              LED1 LED2 LED3 LED4  LED-3MM                                                     
                      LED5                                                                             
1    MCP23017-E/SO    U33                  SOIC-28W                                                    
4    RELAY G6K-2P-Y   RELAY1 RELAY2 RELAY3 RELAY_G6K-2P-Y     NOTE can use 5v relays also, see J77                                           
                      RELAY4                                Must use these relays, G6K-2P-Y   (aliexpress etc)                                           
1    RELAY-G5V-2      RELAY5               RELAY-G5V-2      RELAY 12v OMRON G5V-2 SERIES  Any similar DIP relay OK.                 
2    ULN2803A (DIP18) U44 U55              SOIC18W          HIGH-VOLTAGE,HIGH-CURRENT DARLINTON ARRAYS 

1    PCB Ant switcher by VK3PE     Gerbers available.
1    Software to suit.  VK3PE

NOTE:- BOM is for the PCB only, does not include any hardware or other items.

It is assumed you have some knowledge of building your own PCB's and other items.