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ball in a plastic enclosure. When tilted, the steel ball makes contact with electrodes placed in the enclosure. Mercury switches may also be used. Electrolytic tilt sensors are expensive, but are excellent sensors. A single electrolytic sensor can provide tilt information from two axes. The hermetically sealed sensor has one center electrode surrounded by four equidistance electrodes. As the electrolytic fluid makes contact with the internal electrodes, the alternating current (AC) resistance between the electrodes varies in proportion to the degree of tilt. Unfortunately, the electrolytic sensors cannot be read using a direct current (DC) voltage source. This would cause the deposits to form on the electrodes, rendering them useless. Instead an AC voltage of approximately 3 V with a frequency of 1000 Hz is fed to the sensor. The AC voltage from the center electrode is in proportion to the tilt of the sensor. If one were to use the electrolytic tilt sensor, I can suggest one way to set up the information flow. Connect the AC output of the tilt sensor to a bridge rectifier to obtain a DC equivalent voltage. The DC voltage is fed to a voltage-controlled oscillator (VCO). The VCO output frequency varies in proportion to the input voltage. The output of the VCO is transmitted over a radio link to a receiver on the motion platform. The receiver reads the frequency (tilt) and activates a proportional control to tilt the platform. Spectron, Inc., offers an integrated circuit, the SA40011, that simplifies interfacing electrolytic tilt sensors. The DC output from the SA40011 can be fed to a VCO as described before. Again, implementing tilt to the operator is the difficult part of the system. Proportional pneumatic or hydraulic systems can be employed to the seat to provide tilt.

Fig. 10-15.

Since its implementation, the SAN has been a huge success. R&B employees can access data quickly from anywhere in the company,

The video range of our small transmitter is approximately 100 to 300 feet (ft). Obviously for longer distances another system needs to be employed; it is called amateur television. Amateur television (ATV) has been around for a number of years. It s been a method for radio amateurs to communicate via two-way television. ATV had been the province of the elite radio hobbyist due to the expensive cost of equipment. However, recent advances in solid-state technology have changed that.

For a signal generator, you can use your computer or even your stereo or portable music player. For the detector, biology has given you a ne pair of ears. With any luck, both of these are still in good working condition. If you have a computer you may also have an extra pair of cheap speakers. If you have a stereo system, the speakers that plug into it may have bare wire for their hookup. Either way you need a way to get access to the wire that runs between the audio generator and the output speaker. I found the cheap speakers that came with my computer and cut and stripped the wire on one of the speakers. Before you start cutting wires around your house, be sure you have permission to do so. Spouses and/or parents can be very particular about the shape of their electrical appliances. Once you have access to the wires, it is a simple task to wire a capacitor to them. Turn on a song that has a lot of high and low notes. A squeaky singer against a thrumming backdrop of bass and drums would work. Use your own judgment. With the speaker still attached, listen to the music to get a sense of how it sounds. Now cut those wires and wire capacitors in series and parallel as shown in Fig. 10-16.

Table 10-1 Parts: capacitors. Parts C Tools Speaker Speaker wire (probably already attached to the speaker) Computer, stereo, boombox, or other player Working pair of ears Soldering iron Capacitors: 0.1 mf, 1 mf, 10 mf, etc.