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TomTechTod

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  • TomTechTod's instructable Disable PS4 Startup Beep's weekly stats:
    • Disable PS4 Startup Beep
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  • This one is much more stable, insensitive to touching the antenna or moving it around. The antenna is also much shorter.

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    • Ultrasmall Ultrastable DIY UHF Spy Bug
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    • Coilgun SGP33 - Full Building and Test Instructions
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  • For RF circuits, everything that influences the oscillation frequency should be NPO.

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  • No need to tune anything if using component values from the schematic. If you change the SAW resonator you will need to reajust some values as I described.

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  • Ok, so I just did a test and removed the antenna and left only the receiver dongle and attenuator connected. The range drops to about 10m max. The signal gets considerably stronger depending on distance to the transmitter so an additional switch to disconnect the antenna or an additional attenuator would probably work at short distances. Determining direction is then solely done by walking around and observe signal strength/beep vs background noise strength.

    The unit as shown weighs 1.26g including battery. A bigger battery and some modification to the circuit could increase transmitting power yes. The disk cannot be conductive, that would severely degrade antenna performance, they are made out of plastic right?Through thick brush you are good for at least 100m with this setup I`d guess, didn`t try it out though. When getting near the transmitter you might have problems determining an exact direction and your object is relatively small so that would be something to experiment with.Since you already know where the disk landed (more or less) maybe an audible signal would be better, with a little buzzer that makes a beep every 1 or 2 seconds, but what could be the range of that? Maybe about 10 to 15m? Just a thought.

    Wow that's some distance. For the antenna other conductive material could be used too, sure, like copper tape for example. You only need one antenna. The receiver antenna is pretty big, I dont know if you want to walk around with this on a regular basis though. The only advantage is its low tech, small and inexpensive

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  • TomTechTod's instructable Tiny UHF Tracker Transmitter's weekly stats:
    • Tiny UHF Tracker Transmitter
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  • Oi, sei que é difícil obter essas pecas no Brasil mas não vendo esses circuitos. Talvez alguém venda um kit um dia? (não vai ser eu :-)) As peças são baratas, não sei se a Digikey manda pra lá, o problema talvez seja taxa de importação.

    You are comparing apples to oranges. Yes it's backwards in time you are right, the point is to use a single miniature button cell and a PCB size of what I showed though. If anybody is willing to post an instructable for free how to built an GPS based transmitter that size I would be happy to see it. :-)Your link doesn't lead to an actual product.

    Hi, no that's definitely not possible with this circuit. The signal strength will vary with distance yes but also with any object in the path or nearby that causes reflection/absorption of the RF signal. The idea behind this transmitter/antenna is really only to determine direction, not distance. If you need distance up to 10m my guess is ultrasound would work pretty well, but that wouldn't really work indoor through walls. RF time-of-flight measurement is surely possible but not an easy task at all.

    SAW surface acoustic waveOOK on/off keyingWTF no idea :-)

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  • Schematic should be better now.

    Yes. One of the "cheap" ones. A headband magnifier would do though for 0201 packages.

    Yes it would make a good instructable probably. For now you can check out my other instructable with the little FM transmitter, the whole process is shown in the video.It is really easy once you get the hang of it. All SMD components can be soldered this way but is really useful for the ones that have pads underneath like DFN packages or chips with middle ground terminals etc. Instead of a professional hotplate you can probably use a stove top. I did do it in a little toaster oven (the ones with the front door). The only thing to be careful with is the time you leave it in there. Components usually have a recommended soldering temperature profile that can be found in their datasheets. But it doesn't has to be complicated, as soon as the solder paste liquified / components are soldered on …

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    Yes it would make a good instructable probably. For now you can check out my other instructable with the little FM transmitter, the whole process is shown in the video.It is really easy once you get the hang of it. All SMD components can be soldered this way but is really useful for the ones that have pads underneath like DFN packages or chips with middle ground terminals etc. Instead of a professional hotplate you can probably use a stove top. I did do it in a little toaster oven (the ones with the front door). The only thing to be careful with is the time you leave it in there. Components usually have a recommended soldering temperature profile that can be found in their datasheets. But it doesn't has to be complicated, as soon as the solder paste liquified / components are soldered on the board remove the PCB from the hot environment. That works best of course on a hotplate or stove top because you don't have to lift the PCB and risk shifting the components while the solder is liquid.

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  • It's a MEMS microphone, the part number is included in the schematic

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  • Thanks. When you click on the schematic picture twice it will open in a new window then there is a link just below the picture named "original DIY file", click on it and the full res pic is available. I don`t know how to make the full res picture show in the instructable itself.

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  • you need to provide more details.

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  • Coming soon: 916MHz, 400m range bug in a ballpoint pen.https://www.facebook.com/Tom-Tech-1162318370524245/

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