referring now to the drawings and more particularly to fig1 the device in accordance with the present invention is generally designated by numeral 10 . the electrotherapeutic device 10 comprises a portable , lightweight housing 12 which has a closed bottom and vertically extending walls attached to the bottom to form an interior chamber 18 . the chamber 18 is divided into two compartments by a separation plate 20 , dividing the interior chamber into a circuit board chamber 22 and a battery , or power source chamber 24 . the box 12 is shown to have a general parallelepiped configuration ; however , the shape of the box can be changed if necessary . the box 12 is provided with a cover 26 , sized and shaped so as to cover the open top of the box 12 , along the perimeter of its walls . the cover 26 can be bolted to the box 12 or otherwise secured thereto , so as to be detachably affixed to the box 12 . in the embodiment shown in fig1 the cover 26 is secured to the box 12 by four screws 17 passing through apertures 19 made in the cover 26 which are aligned with respective apertures 21 formed in supports 15 secured at four corners in the box 12 . one of the vertically extending walls of the box 12 , wall 28 , is provided with an opening 29 therethrough , the purpose of which will become more apparent hereinafter . mounted within the chamber 22 is a circuit board 30 carrying the electronic circuit of a relaxation oscillator 40 in accordance with the present invention . mounted within chamber 24 is a power source , such as 9 - volt battery 32 supplying electrical power to the electronic circuit of the relaxation oscillator 40 . the battery 32 and the relaxation oscillator are disengagingly connected by wires 25 extending from chamber 24 to chamber 22 . reference will now be made to fig2 - 4 illustrating some of the preferred embodiments of the electronic circuit of the relaxation oscillator in accordance with the present invention . the relaxation oscillator illustrated in fig2 is designed to produce a sawtooth waveform . a suitable electronic circuit for oscillator 40 comprises a transistor comprising emitter / base structure 42 connected to diode 44 and resistor 46 . connected to the diode 44 is a first resistor 48 and a second resistor 50 . connected in series to resistor 50 is a variable resistor 52 , which in turn is connected in series to a capacitor 54 . an antenna 60 is provided to facilitate delivery of the signal generated by the relation oscillator 40 outside of the housing 12 . the light - emitting diode 44 is aligned with an aperture 29 in the wall 28 of the box 12 , so that visual observation can be conducted of the operative mode of the relaxation oscillator and non - operation thereof can be visually detected which may be due to inability of the power supply to provide sufficient power to facilitate function of the electronic circuit . the transistor 42 may be a unijunction transistor . the resistor 48 may be a 1 kohm . variable resistor 50 may be a 10 kohms , set on 4 . 1 kohms . the capacitor 52 may have a capacitance of 10 microfarads , while resistor 46 may have a resistance in the order of 43 kohms . the relaxation oscillator used in the present invention is designed to take advantage of the frequency which is determined by a capacitor - resistor combination . this oscillator has distorted wave shapes , allowing various outputs such as square waves , trapezoidal waves , traingular waves and pulses of a very short duration . the use of the unijunction transistor in the relaxation oscillator was influenced by the existence of a negative resistance region in its emitter characteric . fig2 illustrates a relaxation oscillator which produces &# 34 ; sawtooth &# 34 ; waveform . fig3 illustrates a relaxation oscillator which produces positive pulse waveform and fig4 illustrates a relaxation oscillator which produces negative pulse or negative square waveform . operation of the relaxation oscillator 40 will now be addressed in more detail . the transistor 42 has a peak voltage vp and a valley voltage vv . peak point voltage vp controls firing of transistor 42 while valley voltage vv controls the voltage point at which transistor 42 turns off . the system time constant , that is the time required to transmit signals from input to output , can be determined by the value of the resistance and capacitance , in this case by resistance of resistors 48 , 50 , 52 and capacitor 54 . the resultant time constant value rc ( in seconds ) determines frequency of the relaxation oscillator 40 . the timing circuit of the oscillator 40 can be modified , so that the on - off switching of the transistor 42 produces a rectangular wave at base 2 of the transistor 42 . capacitor 54 charges through variable resistor 52 , resistors 50 and 48 until it acquires a charge equal to the firing peak voltage vp . at this point , the transistor 42 fires and the consequently , a negative voltage spike is produced at emitter base 2 when the transistor 42 fires . the electronic circuit 40 of the present invention generates a low frequency current of about 7 - 10 cycles per second . a pulsating electro - magnetic field with the cycle frequency of 7 - 10 per second creates a certain magnetic signal which is believed to provide a therapeutic effect on a human body by stimulating and balancing the flow of bioenergy along acupuncture meridians . alternatively , a resistor 46 may be substituted by a variable resistor connected to base one of the unijunction transistor 42 . depending on the type and the kind of the transistor used , the resistance of the resistor 46 will change from one to two hundred ohms , in accordance with a particular elements utilized in the relaxation oscillator circuit . the relaxation oscillator of the present invention can operate at frequency from the range of 7 - 30 hertz . it was found that such frequency range of below 30 hertz demonstrates a more beneficial effect on a human body than frequency range of above 30 hertz . it can be invisioned , however , that under certain circumstances , this frequency range may be increased depending on the particular type of reaction expected by creation of a high frequency gravitional field in close proximity to a human body . many modifications and changes in the embodiments described herein will be apparent to those skilled in the art . i , therefore , pray that my rights to the present invention be limited only by the scope of the appended claims .
the invention relates to an electronic stimulating device which produces low frequency pulsating signals generated by a relaxation oscillator . the electronic circuit board is mounted within a lightweight portable housing to enable a user to conveniently carry the device at all times , if desired .