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In Reply to: RE: Interesting find adding a DIY volume remote posted by airtime on November 11, 2016 at 05:47:39
I haven't done it. But if I was so inclined would lean towards mechanical solution driven by Arduino components, either belt drive or friction. My guess would be that it would end up around $125.
Another mechanical route would be to use RC components, probably pick up a scrap unit inexpensively. The servo's have a lot or torque.
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I'm talking about stepped attenuator with discrete component type setup not a rotary carbon film pot. You can buy a cheap motor unit, that's no problem.
You can use the carbon pot but would have to rewire it. Use a fixed value resistor in line and the variable pot would change the resistance to ground.
Sorry, should have explained that. Servo's have built in position encoders, so you command them to rotate a specific increment, or number of degrees. With a stepped attenuator, you set the increment to a single step.
These are 15 degree steps
15 degrees would be no problem. Typical is 1/10 of a degree resolution.
So the unit doesn't have a stepped attenuator and you want to add one and control it? The servo won't care if it is stepped or not. But I can see your point, simpler to control the steps with relays. Coto 2900 0043 relays or similar are very good. Arduino or the similar Mexican company, can't recall the name for control.
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