Transducer Circuit Description

Introduction |  Mechanical Design |  Electrical Design |  Micro-controller | System Operations | Conclusion and Findings |  The Team

 

In order to integrate our EMG Circuit and our micro-controller we needed to construct a transducer that would only allow a maximum of 5 volts at the input of the controller. 

 

 

The transducer circuit is used to control the level of voltage that is inputted into the micro-controller.  The maximum rating that the controller can handle is 5 volts DC.  Therefore the transducer makes sure that the pulses are never larger than 5 volts.  The first stage in the circuit is an amplifier controlled by the feedback 10K pot.  This pot adjusts the gain to the desired level, in our case just below 5 volts, about 4.8 V DC.  The second pot, 10K also, controls the balance of the voltage, it is to be adjusted to 0 volts.  The second stage of the transducer is a unity gain amplifier.  It’s only purpose is to invert the previous waveform.  This is needed because the first stage inverts the signal negatively.