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Transcutaneous Electrical Nerve Stimulation or TENS is an electrotherapeutical process of using electrical current to excite and stimulate the nervous system of a living body. The term ‘electrotherapy’ has applied to a variety of treatments including the use of machines such as the deep brain stimulators for neural diseases, shock therapy, etc. This term has also been applied focussing to the use of electrical current to speed up the process of wound healing. Additionally it is a non pharmacological treatment and falls into the category of alternative cures and medicines. TENS devices are used as a noninvasive nerve stimulation system designed to reduce both acute and chronic pain by the application of electrical current through electrodes placed on the skin for pain control. This paper documents the design, operation and construction of such a system which can be used to treat ailments at a very low cost and can also be switched by the user from a low frequency system to a high frequency system for desired application

Design of Transcutaneous Electrical Nerve Stimulating Machine Using 555 Timer and 7555 Timer