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The circuit connects to the insect via a 20 μm gold or platinum wire and to the plant via a copper electrode placed in the soil. The circuit also passes through, normally, a one gigaohm resistor and a 50x amplifier before the results are stored digitally and interpreted by a computer to calculate the final graph.
Electronic pest control is the name given to any of several types of electrically powered devices designed to repel or eliminate pests, usually rodents or insects. Since these devices are not regulated under the Federal Insecticide, Fungicide, and Rodenticide Act in the United States, the EPA does not require the same kind of efficacy testing that it does for chemical pesticides.
A high-voltage power supply powered by wall power is used, which may be a simple transformerless voltage multiplier circuit made with diodes and capacitors which can generate a voltage of 2 kilovolts or more. This is high enough to conduct through the body of an insect which bridges the two grids, but not high enough to spark across the air gap.
A typical flyswatter. A flyswatter (or fly-swat, fly swatter [1]) usually consists of a small rectangular or round sheet of a lightweight, flexible, vented material (usually thin metallic, rubber, or plastic mesh) around 10 cm (4 in) across, attached to a handle about 30 to 60 cm (1 to 2 ft) long made of a lightweight material such as wire, wood, plastic, or metal.
This electronic bug zapper can be used indoors or outdoors and uses blue-violet light to attract and zap mosquitoes, gnats, moths, and most other insects. $35 at Amazon Boundery
Sawyer Products’ repellent is fragrance-free, but it still promises long lasting protection—14 hours to be exact—against mosquitoes and it comes in both a spray and a lotion. $6 AT AMAZON 12.
An example op-amp circuit drawn with Klunky and GIMP. Klunky can be used to draw basic circuits, and then a raster editing program like GIMP to modify the screenshots. The Klunky program is public domain, and he has enhanced it with additional components, etc. (See User:Omegatron#Electronics_diagrams. Enhanced version is here.
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