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  • AlanAudio commented on mikeasaurus's instructable Unusual Uses for WD-402 years ago
    Unusual Uses for WD-40

    It will also stop those escapee fish from going rusty or squeaking when they move :-)

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  • Calibrate a Mechanical Watch Using Sound Waves

    My father used to repair watches as a hobby and at the time, I was interested in radio and electronics.His solution to calibrating watches was a combination of the previously mentioned short wave radio and an oscilloscope, which was mentioned by somebody else.The radio was tuned to the time pips, which were an audible tick precisely every second and that signal was fed to on trace of my dual trace oscilloscope. A small microphone was placed onto the watch, fed to a pre-amplifier and then to the second trace of the oscilloscope.The timebase of the oscilloscope display is adjusted to display the time signal stationary on the screen and then the second trace from the watch will slowly creep either to the right or left. He would adjust the watch so that the display stops moving relative t...

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    My father used to repair watches as a hobby and at the time, I was interested in radio and electronics.His solution to calibrating watches was a combination of the previously mentioned short wave radio and an oscilloscope, which was mentioned by somebody else.The radio was tuned to the time pips, which were an audible tick precisely every second and that signal was fed to on trace of my dual trace oscilloscope. A small microphone was placed onto the watch, fed to a pre-amplifier and then to the second trace of the oscilloscope.The timebase of the oscilloscope display is adjusted to display the time signal stationary on the screen and then the second trace from the watch will slowly creep either to the right or left. He would adjust the watch so that the display stops moving relative to the reference and then the watch is almost perfectly adjusted. It only took a few moments to get it that accurate and then he might leave it alone for a few minutes to see if he could observe any long term drift and then finely tweak it to get it absolutely perfect.

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  • How to Make a Parabolic Microphone With an Old TV Dish

    Many years ago I did a similar project professionally using parabolic radar dishes. The principle is exactly the same.It can be difficult to pinpoint the exact place for the microphone so that it's positioned precisely at the focal point of the dish. I was using dynamic microphones ( which don't use batteries ) and one useful feature of them is that if you feed sound into them from a headphone jack, they replay that sound in a similar manner to a loudspeaker. I then fed the microphone with a series of fairly high frequency ( 5kHz ) beeps and listened from a distance of about twenty yards or more while an assistant adjusted the microphone position. I could walk a few steps from side to sideband easily listen for the sweet spot and try adjustments of the microphone position to improve ...

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    Many years ago I did a similar project professionally using parabolic radar dishes. The principle is exactly the same.It can be difficult to pinpoint the exact place for the microphone so that it's positioned precisely at the focal point of the dish. I was using dynamic microphones ( which don't use batteries ) and one useful feature of them is that if you feed sound into them from a headphone jack, they replay that sound in a similar manner to a loudspeaker. I then fed the microphone with a series of fairly high frequency ( 5kHz ) beeps and listened from a distance of about twenty yards or more while an assistant adjusted the microphone position. I could walk a few steps from side to sideband easily listen for the sweet spot and try adjustments of the microphone position to improve the range. These days, I'd create the beeps on a computer and record them as an MP3 file and play them on an iPod or smartphone.You can also hold up your hand at the sweet spot so that the assistant can align a sight ( short length of 1/2" tube ) to point accurately at it, which makes setting it up on location much easier.Parabs are brilliant for recording birdsong and other high frequency sounds, but become less directional at lower frequencies. They work by magnifying the sound that you do want, whereas professional rifle microphones work by cancelling out the sound that you don't want. You get a higher sound level coming out of a parab and that magnification is clean amplification without introducing electronic noise or distortion.

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