False Money and Documents Detector (ART396E)

   The operating principle is simple: illuminating the document or money with ultraviolet light and it is possible to emphasize details and the water line itself that are invisible with normal illumination.

   The device also helps detect fingerprints of people touching marked objects in cases of abductions, for example.

   It is enough to "smudge" the money from a sequestration with strontium salts, which then mark the fingers of people who manipulate it by illuminating the fingers of persons detained with ultraviolet radiation of the apparatus described, the fingers become fluorescent, as undeniable proof of the crime.

   See that the apparatus we describe works with low intensity, "black light" type radiation used in parties and dances and is totally harmless.

   The circuit consists of a battery operated inverter that powers a 2 to 7 watt bulb, depending on the availability of the assembler.

   In figure 1 we have the complete inverter diagram for ultraviolet lamp.

Figure 1 - Inverter diagram

   The transformer has a 110/220 V or 220 V winding because the 110 V outlet is off, and the secondary is 6+ 6 V with a current between 250 and 500 mA.

   The transistor must be mounted on a heat radiator and the trimpot must be adjusted to obtain greater efficiency or intensity of radiation with the lamp used.

   To test the device, light up in the dark a sheet of plain paper and some plastic buttons, which should appear "fluorescent".

   Experiment with various objects. To use, simply approach the object to be examined under ultraviolet light and turn on the unit.