I was building this circuit and couldn't find the answers to a question that I had. Maybe someone here would be able to help.
I used CdS photoresistors instead of the LED detectors they have and I don't have the reverse behavior (touch switch and relay removed). After building it, I have found that only one motor reacts to changes in the photoresistors. The inputs to the LM386 change appropriately when the photoresistors are un/covered; however, the ouput only changes for one of them.
It's possible that I do not understand the op amp enough to know what should be happening. But, from what I have read, the op amp should increase/decrease the current on the output based on the difference from the inputs. So, I originally thought that only one motor would be steered by the op amp because the other motor is getting all its power straight from the batteries. But then I did not understand why two photo detectors were needed.
Maybe if someone could take a shot at explaining how the op amp is splitting the power between the motors it would clear up what I am doing wrong.
Thanks!
I used CdS photoresistors instead of the LED detectors they have and I don't have the reverse behavior (touch switch and relay removed). After building it, I have found that only one motor reacts to changes in the photoresistors. The inputs to the LM386 change appropriately when the photoresistors are un/covered; however, the ouput only changes for one of them.
It's possible that I do not understand the op amp enough to know what should be happening. But, from what I have read, the op amp should increase/decrease the current on the output based on the difference from the inputs. So, I originally thought that only one motor would be steered by the op amp because the other motor is getting all its power straight from the batteries. But then I did not understand why two photo detectors were needed.
Maybe if someone could take a shot at explaining how the op amp is splitting the power between the motors it would clear up what I am doing wrong.
Thanks!