El ectronic Sensors for the Evil Genius

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An objective lens (LE (SI) with an adjustable focal length gathers tbe reflected image. illuminated by Ibe infrared lens.. and focuses this image at the objecti,'e end of the tube. 'Ille image is displayed on the viewing screen of the tube in a greenish tinge.llle viewing resolution is usually udequate to provide

object identification at u distance of 50 feet or more.

depending upon the infrared source as mentioned earlier.

Transistor QI is connected as a free running reso -nam oscillulOr with a frequency determined by the combination resonance of capacitor C3 and the pri

-mary winding of the step-up transformerTl. This oscillating voltage is stepped up to several thousand in the secondary winding ofTI . Capacitors C4

through Cl 5.lllong with diodes 01 through 012.

form a full-wave voltage multiplier where the output is multiplied by six and is converted to DC. Output is taken between C5 and C15. as shown. and may be either positive or negati,"e depending on the d

irec-tion of the diodes.. The base of 01 is connected to a feedback winding ofTI. where the oscillator voltage is at the proper value to sustain oscillation. Resistor R2 biases the base into conduction for the initial ac ti-vation. Resistor Rl limits the base current. whereas capacitor C2 speeds up the deactivation of Ql by supplying high-frequency energy.llle input power is supplied through switch SI via a snap-in battery.

Assemble the high-voltage power supply board. Stan to insert components into the board holes.. Be sure to start and proceed (rom right 10 left. attempt·

ing to obtain the layout as shown. Certain leads of the actual components will be used for connecting points and circuit runs. Do not cut or trim at this time. It is best to temporarily fold the leads over to secure the individual parIs [rom falling out of the

board holes for now. Note that the solder joints in the multiplier section. consisting of Col through C1S and 01 through 012. should be globular shaped and

smoOlh to prevent high-" olwge leakage and corona.

The solder globs size should be thaI of a BE. Run your fingers over the solder globs and verify the absence of sharp points and protrusions.Also note that TI is lying on its side and uses short pieces of bus wire soldered to its pins as extensions for connections

10 the circuit board.

To test the high~voltage power supply circuit. fol·

low these steps.. SepaTate higlH'oJtage output leads upproximately 1 inch (rom each another. Connect 9 volts to the input. and note the current draw of

approximately 150 to 200 milliamperes when SI is pressed. Decrease the separation of the high-voltage leads until a thin. bluish discharge occurs. using a sep-aration of approximately 112 to ll~ of an inch. Note

the current input increasing.llle increased ,'alue depends upon the length of the spark and should not exceed 300 milliamperes.. Check the collector tab of 01 and add a small heatsink.

If you are using a scope. it may be interesting to note the wave shape at the collector tab. Notice this occurs without any spark.ing. NOIe also the takeoff

point for the focus lead.TIlis point is approximately at ¹¹⁶ the output voitage.llle unit may be powered up

to 12~I'olfs direct CIIrrelll (VOe) but will positi\'ely require iI heatsink on the tab

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This unit is capable of producing 10 to 20 KV from a small. standard 9-volt battery. I t is buill on a printed circuit board or a small piece of perforated circuit

board and can easily be housed or enclosed. as the application requires. Applications indude powering image con"erter tubes for night vision de\'ices.. igni·

tion circuits for flame-throwing or flame-producing units. capacitor charging for energy storage. electric shocking fence. inseci eradication. Kirlian photogra·

phy. ion propulsion electric field generators.olOne producing. and more.

To begin the assembly of the night scope viewer.

refer to Figure 3-13 Clnd follow these steps. Assume the power bO<lrd as omlined is properly operating.

Check for the absence of corona in the high-voltage section. Use a coating corona dope to reduce electri·

c<llieakage if necessa~'. Remove all sharp points and insulate with corona dope und so on.

Take a window screen and place it flush against the objective end of the image tube. TUBl. Auach it with a piece of clear scotch tape. Secure the lUbe on the bench with modeling day. and tcmporaril)'

connect it to the leads from the power board.

Observe the proper clearance of the leads and com·

ponents.. Darken the room and place a source of infrared filter light pointing toward the lUbe. (Use a

76 Electronic Sensors for the E v il Genius

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flashlight preferably with an IR filter.) Note the greenish glowing of lhe tube and Ihe image on the SlTCen appearing either sharp or blurred. I f the image

hgood and sharp. you arc in luck. You may further improve Ihe focusing by adding the JJ megohm resi

s-tors. This i s usually nol necessary.

Fabricate ENI from a 7-inch length of 21th -inch

illSi(11' l!;(Il1ll'ler (ill) schedule -Ul PVC tubing. Note Ihe hole adjacent 10 the HA I handle for feeding

high-voltage wires to the lUbe from the power board