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High Frequency Bandpass Filter

high frequency bandpass filter

    bandpass filter
  • A filter that attenuates signals both below and above the desired passband.

  • A band-pass filter is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range. An example of an analogue electronic band-pass filter is an RLC circuit (a resistor–inductor–capacitor circuit).

  • An electric circuit designed to pass only middle frequencies.

    high frequency
  • (in radio) A frequency of 3–30 megahertz

  • High frequency (HF) radio frequencies are between 3 and 30 MHz. Also known as the decameter band or decameter wave as the wavelengths range from one to ten decameters (ten to one hundred metres).

  • high pitch: a pitch that is perceived as above other pitches

  • 3 to 30 megahertz

high frequency bandpass filter - TOA FB-100

TOA FB-100 10 Subwoofer 450 Watts 10 Inch Woofer Ported Enclosure Acoustic Bandpass Filter

TOA FB-100 10 Subwoofer 450 Watts 10 Inch Woofer Ported Enclosure Acoustic Bandpass Filter

The FB-100 features a high-performance tuned, ported enclosure with an acoustic bandpass filter design to eliminate the need for an external crossover. An omni-directional coverage pattern allows flexible placement floor, wall, corner or ceiling. The FB-100 has a heavy-duty 10 inch woofer for high power handling and extended low frequency response. The solidly constructed, paintable enclosure has a removable terminal block for loop-through terminations and six rigging points for suspended mounting. Options include a matching transformer for connection of the FB-100 to distributed speaker systems and a 900 Series Low Pass Filter Module for convenient system equalization. The FB-100 also carries a five year warranty.

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detIMG 2351

detIMG 2351

Here you can see Q127 fixed filter bank in single width panel, two Q106 Oscillators in double width panel, two Q107 filters in one panel, and Q112 mixer (both sections). For the OSCs I omitted octave range switch but added two switches in combination where switching between four octaves is possible.Here's also only one pot (10turn) for the initial frequency control instead of coarse and fine control. I have added a waveform selector and output swing switches.
The two Q107 filters I have ''modified'' for my needs - only two bandpass outputs, but with soft/hard clipping feature in front and the hardwired-cross-modulation switches as well. Of course, it is intended for mono-in/stereo-out use mainly.

High frequency standing waves in Neon

High frequency standing waves in Neon

I was surprised that this came with a high frequency invertor - I was expecting to find the usual dangerously humming chunky transformer. If you look very carefully at the neon strip you can see bright-dim standing waves along it. Must look up the theory on this. You won't see this on any of the other tubes due to the persistence of the phosphor. Other than the neon tube, all the tubes are coated internally with white phosphor. The green and yellow colours are due to thick plastic coatings. Where they are cracked, white shows through.

high frequency bandpass filter

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