Vicky-Twenty Build Question on L4 - The Choak

[robert_sissco]

I have been back and stepping away from a no video Vicky-Twenty build for about two years now.

All the MOS chips work (tested in a good working VIC-20 CR board), all parts are soldered (no missed pins), ect.

Taking another look at the board, I notices something on L4, the Choke. One corner is notched. I set it so that the orientation is the same as the choke on the board, but this puts the notch on pin 4, not pin 1.

Are these choaks keys and should the notch be on pin 1?

I have tried searching for a confirmation online but I am not finding anything definitive.

 

[syzygy]

Failing a copy of the schematic, does any of this help?


from:

BOM L4 Mouser part# https://docs.google.com/spreadsheet...a8gI2tyBkWfOsQWBjT3GRC3bY/edit#gid=1630998256
Mouser Part link
Mouser data sheet for L4
Relevant but not exact question/answer on stackexchange.

 

[robert_sissco]

Thank you, my choak in L4 is in the same orientation at the one int he video, and it looks to be very similar to my part. Plus the voltage at the chips and ports are correct, it was just something I noticed taking another look at it.

 

[Hugo Holden]

These are common mode chokes. The pin spacing is such that they will work exactly the same if you rotate them 180 degrees on the pcb.