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How would one best control the output volume on such a DIY amp? 2-channel logarithmic 10K potentiometer in front of both inputs? What if you use balanced input
by dbrgn 8y ago
How would one best control the output volume on such a DIY amp? 2-channel logarithmic 10K potentiometer in front of both inputs?
What if you use balanced input?
- kazinator 8y agoIf your input is balanced, it will be handled by some op-amp circuit or whatever, which converts to single-ended internal signal, like the "balanced line input module" shown in this page: http://sound.whsites.net/project30a.htm http://sound.whsites.net/project30a.htm You can easily insert a volume control right after such a stage.
- dbrgn 8y agoYeah, but in the context of this article, I'd have to cut some traces on the PCB to get there. Doesn't sound like the ideal solution to me :)
- brokenmachine 8y agoThe 3e Audio board has jumpers to choose between single-ended and balanced I believe.
- deleted 8y ago[deleted]
- kazinator 8y agoPerhaps, perhaps not. The schematics don't seem to be available, but let's imagine there is a stage in there which looks roughly like this: |\ C |\ | >--||-+-----| > |/ | |/ < < R < | V If we simply remove/desolder components C and R, we should be able to then install hookup wires for a potentiometer (which includes the C also). It looks like this particular board has tiny SMT components, which make this sort of thing a pain in the but.