Re: uBitx V4 Audio extremely quiet and other needed mods#ubitx
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The v4 audio amp was meant for comfortable headphones listening. You can add an LM386 amplifier or even a TDA2003 in place of this for more gain. Without the agc, it is best to add the gain after the volume control
- f
Erik
you can imagine your 4 rigs there, and your nice data gathering, describe the audio output.? I find audio is adequate in headphones - using speakers perhaps greater difference of opinion may abound.? please note that v4 uses a simple pair of transistors for the audio output, perhaps with less max power output than the previous (and upcoming) versions that use an IC.? I confess for CW work I need audio filtering anyway, so I use a NESCAF - that works nicely for SSB also -- this includes a LM386 output stage to drive my headphones.? I guess the speaker isn't finding much use in my operating.?
BTW I installed the sidetone mod described at the K3PZN website.? This one is configured to route such that it isn't impacted by the volume setting.? its a cut trace, a 1meg resistor in my case and a piece of wire.?
If your builders want more robust audio inside the box - I am suspicious a search here will provide some ideas.? Also check to see what is posted, but I find content isn't any better vetted than what is here.?
73 Curt
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