The ‘Potato’ mod on rev 0.7

Hi,

Changing 74AC74(U11) with PO74G74A has been suggested for a long time. I can confirm it is safe and easy to do, here in few simple steps:

1. Remove U11, preferably by hot air. Turn the board back and cut the 5V trace in the corner

(click for larger view)

2.  Solder the new chip and put a small wire between the two decoupling caps (hot side, not GND)

(click for larger view)

You are all set!

73!

6 thoughts on “The ‘Potato’ mod on rev 0.7

  1. Dale Robins (2W0ODS)

    Was this the Potato 74 Series I sent to you Chris?
    Glad to see this project is going well, love the look of the 0.8
    Will have to order one in the new year.

    Reply
  2. D. Mueller

    Yes. Signal quality is much better on the higher bands. Wonder why the Potato chip is not standard in the kit. Or with 0 ohm pads to have a choice of either using the Potato PO74G74A or the classical 74AC74. 😉

    Reply
    1. m0nka Post author

      Hi,

      Because this company seems to only sell on Ebay. Then post with some substandard delivery
      method. It is just not convenient for constant stock resupply. Otherwise they have some
      other even more interesting chips…

      As for the dual footprint, totally my fault, i didn’t find the time to test earlier, sorry.

      73!

      Reply
    1. m0nka Post author

      Hello,

      I think was described in some doc in the group or Github, can’t remember. The chip works upto 750 Mhz and
      allows the mcHF mixer to operate better on 10m, if i remember correctly.

      73

      Reply

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