In the present work, a biomechanical prosthesis with the acquisition of EMG signals will be designed for patients who have lost their right upper extremity due to a transradial forearm amputation, with a short stump before the elbow and an affected psychological factor. For these reasons, the EMG signal acquisition circuit will be designed from operational amplifiers (OPAMPs), which will obtain, filter, and amplify the electromyographic signals acquired from the stump and encoded on the Arduino nano board. being these used to perform the main movements with Maxon motors of pronation and supination in the biomechanical wrist, as well as the movements of the fingers to release and grab an object of the biomechanical hand, where the motor stops turning when it grabs an object if it meets the thermoresistor included in the tip of the index finger. Then, this research will serve for the development of right upper limb prototypes that have the same morphology and modeling of this biomechanical prosthesis, to improve the quality of life of patients who, due to this type of amputation, have been affected in their motor capacity. and psychological.