anun
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hi everybody,
i've tried to build this circuit, however, this doesnt seem to work... can anybody please help me, this is supposed to be an ion detector... i want to know if this circuit would ever work. if it doesnt, is there any way i can make an ion detector.
thanks a lot.
anun
this is supposed to be the circuits description:
In that circuit, a telescoping antenna is used as the pickup. In the presence of an ion field, ions accumulate on the antenna, causing a minute negative current to flow to the base of Q1. Capacitor C1 and resistor R1 form an RC network, whose function is to eliminate any rapid fluctuations. Once the negative current becomes large enough, it causes Q1 to turn on, connecting the negative terminal of battery B1 to the base of Q2. That forward biases Q2, causing it to turn on. That, in turn, couples the base of Q3 to the positive terminal of the battery, forward biases Q3 - whose collector is in series with current-limiting resistor R2 and meter-sensitivity control R3 - causing it to conduct.
With Q3 turned on, meter M1 indicates (in a non-linear manner) the relative level of ion flux, while LED1 (which is connected in series with Q3's emitter) lights to give a visual indication of strong ion fields. It should be noted that in order for the unit to operate properly, some sort of ground is usually required.
Metallic tape is used in the prototype to provide a convenient contact for the users hand, thereby providing a partial ground. If possible, such as when the unit is used as a monitor at a permanent location, the detector should be grounded to a water pipe, or some other convenient grounding point.
The detector is set up to detect negative ions. It can be made to detect positive ions by simply reversing the polarity of the transistors that comprise the circuit, i.e., PNP units become NPN units, and NPN transistor is replaced by a PNP unit. It should not that the performance of the detector is seriously affected by high humidity. Damp or moist air tends to impair the circuits ability to detect ion flux.
The Ion Detector can be used to give a quick indication of the presence of a negative ion field, aid in identifying its source, and indicate its relative strength, but it is not designed to provide an absolute measurement of flux intensity. The circuit can also be used to aid in making adjustments to ion sources, by noting the meter's needle deflection as you attempt to increase or decrease ion emissions. The Ion Detector can also be used to ferret out residual ion fields, check for ion leakage (in shielding tests, for example), or to test for static charges (in people's clothes, fluorescent lighting, plastic containers, certain winds, etc.), along with a host of other applications.
i've tried to build this circuit, however, this doesnt seem to work... can anybody please help me, this is supposed to be an ion detector... i want to know if this circuit would ever work. if it doesnt, is there any way i can make an ion detector.
thanks a lot.
anun
this is supposed to be the circuits description:
In that circuit, a telescoping antenna is used as the pickup. In the presence of an ion field, ions accumulate on the antenna, causing a minute negative current to flow to the base of Q1. Capacitor C1 and resistor R1 form an RC network, whose function is to eliminate any rapid fluctuations. Once the negative current becomes large enough, it causes Q1 to turn on, connecting the negative terminal of battery B1 to the base of Q2. That forward biases Q2, causing it to turn on. That, in turn, couples the base of Q3 to the positive terminal of the battery, forward biases Q3 - whose collector is in series with current-limiting resistor R2 and meter-sensitivity control R3 - causing it to conduct.
With Q3 turned on, meter M1 indicates (in a non-linear manner) the relative level of ion flux, while LED1 (which is connected in series with Q3's emitter) lights to give a visual indication of strong ion fields. It should be noted that in order for the unit to operate properly, some sort of ground is usually required.
Metallic tape is used in the prototype to provide a convenient contact for the users hand, thereby providing a partial ground. If possible, such as when the unit is used as a monitor at a permanent location, the detector should be grounded to a water pipe, or some other convenient grounding point.
The detector is set up to detect negative ions. It can be made to detect positive ions by simply reversing the polarity of the transistors that comprise the circuit, i.e., PNP units become NPN units, and NPN transistor is replaced by a PNP unit. It should not that the performance of the detector is seriously affected by high humidity. Damp or moist air tends to impair the circuits ability to detect ion flux.
The Ion Detector can be used to give a quick indication of the presence of a negative ion field, aid in identifying its source, and indicate its relative strength, but it is not designed to provide an absolute measurement of flux intensity. The circuit can also be used to aid in making adjustments to ion sources, by noting the meter's needle deflection as you attempt to increase or decrease ion emissions. The Ion Detector can also be used to ferret out residual ion fields, check for ion leakage (in shielding tests, for example), or to test for static charges (in people's clothes, fluorescent lighting, plastic containers, certain winds, etc.), along with a host of other applications.
