No drummer? No problem! With a little ingenuity, you can stuff the essentials of a drum kit into a box , and automate your rhythm section. The drum machine is mostly mechanical, reminding us somewhat of the Wintergatan Marble Machine which is as captivating to watch as it is to hear. The DrumCube has a snare drum played by two servo-controlled sticks, a kick drum using foam waggled back and forth between two piezo transducers hooked to a low-pass filter, and a reverse-biased transistor white noise generator used for the hi-hat.
Forgot Password? An RF filter is an electrical circuit configuration network designed to have specific characteristics with respect to the transmission or attenuation of various frequencies that may be applied to it. This filter can give you that extra boost. Its primary application is reducing interference between HF stations operating in close proximity. May QST pp.
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Posted by Razvan Dec 16, In the shack 8. For this design I am assuming the signal used to drive the amplifier is clean and complies with legal requirements in terms of harmonics and IMD products. These filters are only designed to stop any additional harmonic products generated by a correctly functioning amplifier and to keep their level within legal limits.