Add Ext Beeper to older Stratologger CF PCB

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Well-Known Member
TRF Supporter
Oct 13, 2014
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Bridgeton, NJ
I'd like to add the SL CF ext beeper to an older CF PCB - the model just before they revised the PCB for the 3-pin modular connector.

After reviewing some of the past TRF posts about the beeper, and comparing both PCBs it appears possible. If I haven't missed anything, all that is needed is:
(1) A connection to R14 (the 3.3v logic),
(2) The addition of a 33 ohm resistor (R18) for the +V line, and
(3) A ground connection

Of course this assumes the revised CF PCB/circuitry didn't include something not visible that would be important for the beeper's operation.

Has anyone done this? If so, anything I missed or something else? Is your mod working OK?
I don't have the answer for you, but have you asked PerfectFlite about this? They're really good about responding to questions via their website. I've always received responses back in a day or two.
Not yet, but I know that option exists. I was just wondering if anyone else had considered it and what their experience might have been. Guessing from the absence of replies it's not happening or not worth the effort.