SHOWALL FUN PRANKS HIGH VOLTAGE LAZARUS-64 PHOTOGRAPHY SPY GADGETS VIDEO GAME
Figure 30 - How small can you make this project?
Figure 30 - How small can you make this project?

Having so few components, the project lends itself well to miniaturization. Of course, the tighter you pack the components, the more chances of stray capacitance, so beware that size reduction may also mean a performance reduction...or complete elimination! I managed to cram all of the parts on a bit of perforated board no larger than the diameter of the nickel sized 3 volt coin battery and it worked just as well as the larger version with a slight frequency shift. Actually, this is version 2 of the mini transmitter as version 1 seemed extremely instable. I just moved the component around a bit and the instability was magically cured. Welcome to the dark art of RF circuit building!



Figure 31 - The completed miniature version of the transmitter
Figure 31 - The completed miniature version of the transmitter

If you have some skill with a soldering iron and a steady hand, this pop-top sized version of the Spy Transmitter would like gigantic compared to one built using surface mount components. It would be possible to make a performing unit that would be no larger than a pencil eraser, running from a pair of watch batteries. Of course, for that kind of miniaturization, some kind of copper clad board will need to be made using a Dremel tool as perf board is not going to be of much use for surface mounted components. I will leave you to send me a photo of this project made smaller than my current 1 inch diameter version!



Thanks for "tuning in". I hope this project was an enjoyable pathway to many more interesting and complex radio frequency gadgets. I will be adding many more transmitter projects in the future as well, including those that can transmit video and encoded information. Of course, all of these devices are for fun only, and never to be used to intrude on anyone's privacy or operate in places where prohibited. Now, I must run, as that un-marked van has once again pulled up in front of my secret lab and the men in black are heading to the door...!
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