Author Topic: 12-position switch has too many legs?... (Three pole switch, one pole on PCB)

September 07, 2024, 07:16:19 PM
Read 493 times

Tinu_CH

  • Newbie
  • *
  • Posts: 3
  • Karma: +0/-0
    • View Profile
Hi JPK!

Working on my 573 module at the moment, all is well until now.
Now i'm confused that the 12-way rotary switch for the mid frequency has three central connectors (There's like
an outer and inner ring of connectors), but only one hole for the inner connectors on the PCB.

edit: I think as an electronics idiot - the actual switch is a 12-way three pole switch, but the PCB
is made to accept a 12-way one-pole switch.

Is this a sourcing thing? Can two of the three legs just be nipped off?

Thank you very much for clarification :)

Best, Martin
« Last Edit: September 08, 2024, 12:32:27 PM by Tinu_CH »

September 09, 2024, 08:56:04 AM
Reply #1

JPK

  • Administrator
  • Hero Member
  • *****
  • Posts: 1117
  • Karma: +37/-0
    • View Profile
Sorry for the confusion.
You have to cut two pins, but not just any pins.
First make sure the switch is rotated all the way counter clockwise.
Then locate the stops which prevent the switch to rotate continuously (circled in blue in the picture).
The pin you want to keep is the one closest to the stops on the inner circle (circled in green).
Cut the 2 other pins on the inner circle (circled in red).
JPK

September 09, 2024, 12:53:39 PM
Reply #2

Tinu_CH

  • Newbie
  • *
  • Posts: 3
  • Karma: +0/-0
    • View Profile
Thanks JPK! 

If i may ask - am i right in the assumption that cutting any leg would have worked, but resulted in the wrong sequence of
frequencies? I tested the switch with a DMM, and each outer leg did make contact with all three inner legs when active. 

Plus the inner legs had contacts between them as well. 

Best and thank you for the fast help. 

Martin

September 10, 2024, 10:13:43 AM
Reply #3

JPK

  • Administrator
  • Hero Member
  • *****
  • Posts: 1117
  • Karma: +37/-0
    • View Profile
am i right in the assumption that cutting any leg would have worked, but resulted in the wrong sequence of 
frequencies?

Absolutely right.
JPK