This circuit is a contractor or muscle stimulator.
The purpose of this is educational, because its development was to the study of muscle contraction in terms of power in this case the contractor delivers 2mJ to its output at this level energy we obtain a good contract which I tried in my pain free, if used with appropriate electrodes, in my case I use electrodes which are available online for $ 20 ar.
The circuit operation is very basic, consists of an oscillator and a variable current limiter for the output stage, this output stage is an inverted transformer 220V to 12V 300mA and both the driver and the control processor limitation outlets are developed with a TIP31C each.
The 555 is responsible for generating the pulses to be monitored in the series that has led to his departure, thus leaving the control frequency and control of these same intencidad be adjusted for treatment area.
NOTE: Keep use criteria.
Then leave the same circuit.
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