Hey,
I'm just poking around an idea for a Balance pedal for a guitar and I have the basic idea down of what I would like.
Basically the input AC signal (assumed to be at most 1.2V RMS) is first biased using a voltage divider and a 9V source. Biasing to be determined by the saturation voltage of the balancing opamps/transistors.
Next the 9V source (Not divided) is divided but now using a variable resistor. This will be considered the "direction" control. So I've specified it that when the direction control is 9V then the LEFT channel output is equal to the input signal. 0V = RIGHT output = Input signal.
So my problem lies in figuring out how to do this balancing. I was thinking of using two opamps. One that takes in the direction control and the biased signal to produce a buffered LEFT output. The other one would also take both in but produce the RIGHT output that is inverted compared to the LEFT output. EG: Signal = 1V RMS LEFT out = 0.4V RMS, then RIGHT = 0.6V RMS.
However, the 741 requires 10V minimum. So should I be using opamps or go to transistors?
That "direction" control is also used to drive 9 leds using an LM3914 Driver. (Where 1V lights up the first led, 2V lights up the second...and so on.) This part I'll have to figure out later and isn't really the important part.
I'm in second year Electrical Engineering...we've done opamps but not transistors yet though. So if you do recommend something could you also explain why I might want to do that.
Thanks for any suggestions and whatnot,
Trevor P
I'm just poking around an idea for a Balance pedal for a guitar and I have the basic idea down of what I would like.
Basically the input AC signal (assumed to be at most 1.2V RMS) is first biased using a voltage divider and a 9V source. Biasing to be determined by the saturation voltage of the balancing opamps/transistors.
Next the 9V source (Not divided) is divided but now using a variable resistor. This will be considered the "direction" control. So I've specified it that when the direction control is 9V then the LEFT channel output is equal to the input signal. 0V = RIGHT output = Input signal.
So my problem lies in figuring out how to do this balancing. I was thinking of using two opamps. One that takes in the direction control and the biased signal to produce a buffered LEFT output. The other one would also take both in but produce the RIGHT output that is inverted compared to the LEFT output. EG: Signal = 1V RMS LEFT out = 0.4V RMS, then RIGHT = 0.6V RMS.
However, the 741 requires 10V minimum. So should I be using opamps or go to transistors?
That "direction" control is also used to drive 9 leds using an LM3914 Driver. (Where 1V lights up the first led, 2V lights up the second...and so on.) This part I'll have to figure out later and isn't really the important part.
I'm in second year Electrical Engineering...we've done opamps but not transistors yet though. So if you do recommend something could you also explain why I might want to do that.
Thanks for any suggestions and whatnot,
Trevor P