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If you wish to experiment, you can try an indoor 5 whip without the coil and see how the circuit performs You could also experiment with an outdoor whip antenna without the coil and you could build the coil and place it in series with an outdoor whip antenna if desired The Lightning Monitor needs a power supply which can provide a 12 volt source for the audio amplifier circuit as well as a plus and minus power supply for the op-amps The diagram in Figure 16-5 illustrates a 12 volt and dual plus/minus 5 volt power supply which can be used to power the Lightning Monitor The prototype Lightning Monitor incorporated the power supply in the same chassis as the actual monitor You will need to locate a 12 volt, 250 mA center-tapped transformer ahead of the rectifier circuit The rectifier circuit is fed directly to the regulator integrated circuits as shown You will need to connect the dual voltage power supply to the Lightning Monitor The plus voltage is connected to pins 7 on both the LM741 and the LF355 op-amp as well as to the J-FET at Q1 The negative voltage supply is connected to pin 4 of both the LM741 and the LF355 op-amp, as well as to the JFET at Q1 The 12 volt power supply is used to power the LM380 audio amplifier Once the power supply and Lightning Monitor have been completed, you connect the whip antenna-1 and the Capacitive Hat antenna-2 and prepare for testing the Lightning Monitor To best test the circuit you will need to wait for a thunderstorm However, you can do some testing of the circuit First, apply power to the Lightning Monitor circuit, turn the Off-On switch to the On position Make sure both antennas are connected Turn up the main volume and the Static Volume controls past the 1 2 position and adjust VR7 to past 1 2 You will need to generate some static electricity by rubbing a lucite rod with some animal fur to create a static charge Bring the lucite rod near the Capacitive Hat antenna and you should see the Static Meter at M2 swing into action This will give you a good indication that the Static portion of the meter is working You may be able to test the Spheric Meter portion of the circuit if you have an RF broadband noise generator If the Lightning Monitor doesn t seem to work at all or appears DEAD, then you will want to turn Off the circuit and remove the power and inspect the circuit board once again While inspecting the circuit board.

Before we go ahead and install the semiconductors, let s take a brief look at the semiconductor pin-out diagram illustrated in Figure 23-5, which will assist you in orienting the integrated circuits Now you can go ahead and mount the semiconductors Begin by installing the Varicap diode at D1, and the 51V Zener diode at D2 and transistor Q2 Next, install regulator U5 and its associated heatsink These parts are secured to the board using a 6 mm-long M3 screw, nut and lock-washer

For high school students interested in obtaining general information on various engineering disciplines, contact the Junior Engineering Technical Society by sending a business-size SASE (with six rst-class stamps af xed) to the following address: JETS-Guidance 1420 King St, Suite 405 Alexandria, VA 22314 jetsorg For information on the various elds of engineering, consult the following sources: American Society of Civil Engineers 1801 Alexander Bell Dr Reston, VA 20191 asceorg American Society of Heating, Refrigerating, and Air-Conditioning Engineers 1791 Tullie Cir NE Atlanta, GA 30329 ashraeorg American Society of Mechanical Engineers International Three Park Ave New York, NY 10016 asmeorg Institute of Electrical and Electronics Engineers 1828 L St NW, Suite 1202 Washington, DC 20036 ieeeorg The Minerals, Metals, and Materials Society 184 Thorn Hill Rd Warrendale, PA 15086 tmsorg

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Advisory Council on Historic Preservation 1100 Pennsylvania Ave NW, Suite 803 Old Post Of ce Building Washington, DC 20004 achpgov Association for Preservation Technology International 3085 Stevenson Dr, Suite 200 Spring eld, IL 62703 aptiorg National Register of Historic Places National Park Service 1201 Eye St NW, Eighth Floor (MS 2280) Washington, DC 20005 crnpsgov/nr National Trust for Historic Preservation 1785 Massachusetts Ave NW Washington, DC 20036 nthporg Society of Architectural Historians 1365 N Astor Chicago, IL 60610 sahorg