Electronic Muscle Stimulator

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Student Number:R001251K

Course CR 10066

Research Project

DECLARATION

I of the following student number declare that this circuit is researched and constructed by me

Signature...........................................................

INTRODUCTION

An electronic muscle stimulator is a circuit designed to stimulate nerves of that part of the body by attaching electrodes. It is used to revive frozen muscle that impair movement, it aid in building up muscles and it also helps in removing cellulites in the body

EMS causes adaption, i.e. training of muscles fibers and can be used as a therapeutic tool. In medicine it is used for rehabilitation purposes, for instance in Physical therapy in the prevention of disuse muscle atrophy which can occur for example after musculoskeletal injuries, such as damage to bones, joints, muscles, ligaments and tendons.

BLOCK DIAGRAM

CIRCUIT DIAGRAM

SIMULATION OF THE CIRCUITss

SIMULATION OF THE CIRCUIT (PROTEUS)

[pic]

CIRCUIT DISCRIPTION

At start-up the 5Vdc voltage from the External source (Battery) is supplied to the input of the control circuit of the EMS, where the control circuit inverts the 9v dc into a pulsating wave. The preset level controller is used to vary the frequency of the EMS to low, medium and high. The lower the resistance the higher the stimulation, the higher the resistance lower the stimulation. The intensity control is used to determine the intensity of the stimulation. The transformer is used to output a sinusoidal wave which varies from (30-60) Vac. The electrodes are generally pads that adhere to the skin.

MATHEMATICAL DESCRIPTION

USED FORMULAR

F=1.44/ (RA+2B) C

F low=1.44/(1000+(2*180k))(0.01uf)

=1.439Hz

F medium=1.44/(1000+(2*1.8k))(10uf)

=3.89Hz

F high=1.44/(1000+(2*2.2k))(10uf)

=6.857Hz

COMPONENTS LIST AND FUNCTIONS

|1. Six resistors |

R1=180k,R2=1.8K and R3=2.2K

Function - Boost the current in the circuit

|IC1 |

7555 IC

Function- Generate frequency

|2.Two Transistors |

T1(BC327) and T2(BC327)

Function- Boost the strength

|3.Diode |

1N4007

Function- Protect the second transistors from different voltage varied from the variable resistor

|4.Variable Resistor |

VR 4.7K

Function

|5.LED |

One Red

Function- Shows the pulse generated by the ic1 7555 timer

|6.Transformer |

Step down transformer 240v/12v

Function- Provide shocking current

|7.Two Electrodes |

Two blue in colour

Function- Act as an output and sense current drawn by the transformer

|8.Vero Board...
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