Re: Assembly instructions for the ubitx v4

Evan Hand

From the links and your description, I assume that you have an Amatuerradiokits case with the audio amplifier.  If that is correct, then the data that I have shows a TA4225 (not a TA4425) audio amp IC as the audio amp.  That is a 5 terminal device, not 3.  That board is very cramped, so it could be that the silk screening is really pointing out the TA4225 5 pin socket and not the 3 holes that are close by.

Attached are the 2 pdf files that I have for the audio amp.

My guess is that the 3 hole location is for the onboard "volume" control that is really a maximum volume control as the front panel volume control is used to adjust the volume in operation.  You should have a blue 3 terminal variable resistor that goes into that location.

Please verify the above before you start any modifications or soldering.  If you need more help, I would suggest that you post a picture of the board and the location so that we can better help you.


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