barcode generator c# wpf Figure 9-4 A set of kid s walkie talkies in Software

Encode Quick Response Code in Software Figure 9-4 A set of kid s walkie talkies

Figure 9-4 A set of kid s walkie talkies
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Project 38 The Dog Talker
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Figure 9-5 Removing the plastic cabinet
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long as the transmitter was placed in a good spot without any metal object between it and the receiver With your receiver unit gutted, try to pack everything into the smallest possible container you can find so the unit will be easy to conceal and lightweight The largest parts of the receiver may
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be the battery and speaker, so keep that in mind when searching for a plastic box to contain the unit If you find the speaker a bit too wide for the cabinet, it may be a good idea to install a smaller unit, but you will lose a bit of volume in the process With a little searching, I found a plastic box that fit
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Project 38 The Dog Talker
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Figure 9-6 Re-fitting the receiver in a smaller box
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the circuit board, battery and speaker perfectly, and it is shown going together in Figure 9-6 The original plan was to sew the guts into a doggie vest, but this little plastic box would make the Dog Talker more fun to use because people could notice it from a distance and come to investigate out of pure curiosity Now that the receiver is ready to go, let s modify the transmitter so it is always transmitting and will never hiss due to signal loss We will also solder an external input jack in place of the internal microphone so your voice can be projected to the receiver with much better clarity and this will also allow external sound sources to be used A 1 8-inch stereo jack, like the type you find on the end of a headphone, will be the best type of jack to install due to its common use in audio equipment and small size It is very easy to find a microphone or dubbing cable with this end so you can connect directly to your computer s sound card or an MP3 player There are two types of walkie talkies: those that include an electret microphone and those that use the speaker as a microphone when the transmit button is held in It does not matter which type of unit you have, since you will remove the microphone or speaker, and run the two wires to the external input jack Try to find a space on the original plastic casing where you can drill a hole to install the jack This may be a bit of a challenge on
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the smaller units, and if there is no free room inside the case, you can run the wires through a small hole and solder the jack outside the case I managed to find a tiny space for the jack between the battery compartment and then unsoldered the wires from the unit s built-in microphone and soldered them to the new jack Now another microphone or external audio source could be plugged into the walkie talkie, making it an allpurpose audio transmitter One annoying factor was that the transmit switch would have to be held down in order to transmit, so I decided to trace the contacts with my multimeter and solder them in the transmitting position so the unit would always be sending the signal to the receiver This constant transmission will also stop the receiver from hissing when there is no signal, a dead giveaway that a transmitter is being used Figure 9-7 shows the new 1 8-inch audio jack installed in place of the walkie talkie s built in microphone If you cannot figure out which pins to short in order to fix the transmit switch so that it is always engaged, you can force it closed with some hot glue or shrink wrap, and then remove the plastic knob so it no longer sticks out of the casing If you have no microphone for testing the new input jack, use the original microphone that came with the unit by soldering it to a male 1 8-inch jack You can also feed the output from your computer or
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