(57) Abstract Objective The amplifier which amplifies many electricity probe outputInterlocking electrically, adjust gain. Constitution With electricity probe 2 of many huaradeikatsupuAs for the ion current which it captures, with the respective resistor 3 in voltage VbIt is converted, is amplified with variable gain amplifier 5. toranjisuAs for ta 9 you respond to amplifier output voltage Vbo, the departure which is the indicatory bodyThe electric current which flows to photodiode 11 is controlled. Returning of amplifierJointing the photoelectricity resistant component 14 of photoelectric cell 13 to the quorum circuitIt does, the light-emitting diode 15 which is the luminous element of each photoelectric cellIt supplies electricity from variable direct voltage source 16. Responding to ion currentWhen adjusting the gain of the te amplifier, output of variable direct voltage sourceIn adjusting, changing the degree of radiation of all the light-emitting diodes 13From, it changes the value of resistance of all the photoelectricity resistant components simultaneously.
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