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15kV aus 3,7 Volt
Oder 7kV, ebay

Set 15KV High Voltage Inverter Generator Spark Arc Ignition Coil Module CRH

Output voltage: approximately 15KV
Input voltage: DC 3.7V-4.2V

Note: This item is DIY Kit, not assembled. default with one PCB board.
This product is a booster coil production suite, the circuit is simple and reliable, with a professional line drawings, electronic research convenience enthusiasts
Uses: high school science experiment, electronic equipment, negative ion generator, scientific small production. This circuit is generated when the stable high frequency arc, high temperature, can easily ignite combustible materials, so it was called the plasma lighters
15KV transformer outside dimensions of approximately: 27×16×21mm
Input voltage: DC 3.7V-4.2V
 (limit 12v, easy to damage not recommended, this transformer is equally applicable to 12V input voltage, but requires a corresponding increase in the base of the feedback resistor to about 150Ω ~ 1.5KΩ, its resistance should be large to replace a small adjustment, or burned transistor or transformer)
Input Current: <2A
Output voltage: approximately 15KV
(please pay attention to safety when used)
Output Current: ≤0.4A
High voltage bipolar ignition distance: ≤0.5 cm
When the product input termination 3.7V-4.2V power supply, the secondary high voltage output is not connected to high-voltage rectifier diodes and capacitors, output terminals levels ≤1.5cm long can produce purple high temperature arc, no crackling, but the temperature is very high , you can easily and instantly point cigarette paper, or even very thin wire burned Sparks (such as junior high school chemistry experiment thin wire in oxygen combustion scene, but not as good as oxygen so intense.)
Transformer structure:
There are two primary windings, a primary winding, a feedback winding, the secondary output of high pressure. Other: 15KV transformer designed for maximum output, limit output can not exceed 15KV, is one centimeter arc, a higher output voltage is likely to damage the transformer.
PCB board size: 4.2CM * 3.2CM * 0.16CM;
Installation Notes:
1). With the PCB board parts better production, in which the transformer line of thick line and thin line, this should pay attention to the other components by the board of silk symbols and parameters of welding on the line. Transformer board has done three pads, in which the middle of the pad hole is relatively large, the hole at the same time welding a thick enameled wire and a thin enameled wire, thick enameled wire and fine enameled wire do not use the same side, such as with the left Thick lines and the right side of the thin wire into or with the left side of the thin line and the right side of the thick line welding into, in short, do not use the same side of the thick lines and thin lines can be.
2). In order to prevent the output 2-wire distance too far, resulting in no-load, you can weld a 3P pin at the output.
3). After the success of the production, if the output access to a high-voltage capacitor and three high-voltage rectifier composed of voltage doubler circuit, you can produce DC high voltage, you can make anion generator, wiring diagram is as follows:
Package Include:
15VKE = 1 type step-up transformer x1
PCB Board X 1 
120 ohm resistance X 1
UF4007 ultra-fast recovery diode X 1
N20 transistor X 1
Heat sink X 1
M3 * 6 screws X 1
Boat switch X 1
3-Pin X 1
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