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most of its power from below 1 MHz The basic circuit may be combined with a variety of voltage regulation schemes The original Ambient Power Module is shown in Figure 17-1 and the schematic diagram circuit in Figure 17-2 is used to convert the ambient RF energy to a direct voltage which can be used and handled by data processing equipment This design makes use of doubler, splitter and rectifier circuit configurations Designated as an ambient power module (APM), the circuit is connected to an antenna, preferably a 50 foot or greater broadband monopole antenna The antenna is connected to the APM circuit via two capacitors C2 and C3, each being in series with the antenna input line for coupling and each having a value of 0047 microfarad Taking the left or negative side of the circuit first, it comprises two rectifiers (diodes) D3 and D4 (1N34 type) and a filter capacitor C4 (40 microfarads) Rectifier D2 is connected in parallel

Missouri Drury College (BArch) Hammons School of Architecture Spring eld, MO 65802 druryedu/section/sectioncfm sid=48

The builder has a choice of wiring techniques which may be used to construct the module It may be hand wired onto a terminal strip, laid out on a bread board, experiment board, or printed circuit We chose to build the original circuit on a small printed circuit board Locate a clean well lit work table to build the APM Find a small 27 to 33 watt pencil-tipped soldering iron, as well as some Tip Tinner Tip Tinner is a soldering iron tip cleaner/dressing compound which helps to clean the soldering tip after use and can be obtained at your local Radio Shack store Try and locate a pair of end-cutters, a pair of small needle-nose pliers and a set of screwdrivers Grab your schematic

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Washington University (MArch) School of Architecture One Brookings Dr St Louis, MO 63130 archwustledu/

diagram and look closely at it, before we begin construction The APM power receiver consists mainly of diodes and capacitors and you will recall that both of these type of components have polarity which must be observed for the circuit to function correctly The diodes used in the APM circuit are germanium diodes and NOT silicon diodes which have a voltage drop Diodes will have either a white or black band at one side of the diode s body This colored band denotes the cathode end of the diode When installing the diodes on the PC board make sure you observe the correct placement of all the diodes The APM circuit utilizes various capacitors, both electrolytic and non-electrolytic types Electrolytic capacitors are often larger size capacitors with larger values Electrolytic capacitors have polarity and may have either a black or white color bands with plus or minus marking at one end of the capacitor body When installing the electrolytic capacitors make sure that you orient the capacitors correctly with respect to the circuit diagram The chart in Table 17-1 may help you to identify the small value capacitors In many instances, small value/size capacitors often use a three-digit code to represent a capacitor value Once all the components have been placed on the PC board, you can take a short break and when we return we will inspect the circuit board for possible short circuits and cold solder joints Pick up the circuit board with the foil side facing upwards toward you Look over the board carefully and inspect the solder connections The solder joints should all look clean, smooth and shiny If any of the solder joints look dull, dirty or blobby then remove the solder from the joint and re-solder the connection over again so that it looks good Next we will inspect the circuit board for any short circuit which could result from solder blobs or remaining component leads left from the building process A component lead resting across a PC trace can result in a short circuit which could cause the circuit to fail Once you are satisfied that your circuit looks good, you can move on to testing the APM receiver First you will need to attach a good antenna ground connection to the APM receiver module.