[CW] NM0S - HyperMite 200 Hz Audio Filter - NO RINGING!

Thu Mar 24 01:49:08 EDT 2022

David, the Hyper-Mite is a real addition to  a station even at the QRQ
level.

Until medical knocked me down, I was the Kit Manager for 4 State QRP.
Keeping electronic components available was tough because sales were
stronger than the supply chain.

Chuck - AA0HW has a research report on the filter, it's listed in the sales
page.

73,

Walter Dufrain - K5EST - QRPcw

On Wed, Mar 23, 2022, 21:26 D.J.J. Ring, Jr. <n1ea at arrl.net> wrote:

> This looks like a good piece of kit, http://www.4sqrp.com/HiPerMite.php
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> Does anyone have one of these?
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> If so, do you like it?
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> *HI-PER-MITEAn Active Audio CW FilterDesigned byDavid Cripe, NMØS[image:
> JPEG Not Uploaded Yet]
> <http://www.4sqrp.com/kits/filter/cwfilterdarpic2big.jpg>Click for larger
> image.Kitted and Offered For Sale By The Four State QRP GroupThe
> HI-PER-MITE is a HIgh-PERformance SMALL audio filter. It is designed to be
> very versatile, have low parts count, be inexpensive, yet provide
> outstanding performance. This is a flexible design that can be used as a
> stand-alone unit driving headphones, earbuds, or speakers, or it can be
> easily integrated into an existing receiver needing additional CW filtering
> (see manual for details).Designed by David Cripe NMØS, it features a 200
> cycle bandwidth with NO RINGING! It can be used as an external stand-alone
> unit with an onboard audio amp for driving a speaker or headphones. It also
> can be built into a receiver without using the audio amp, or with it if you
> need an audio stage. This is a very useful accessory for direct conversion
> or other rigs needing additional selectivity. It removes/reduces signals
> and noise outside the 200HZ passband, and also power line hum in Direct
> Conversion receivers. Thus providing comfortable listening while using
> earbuds, headphones, or a speaker. If you have a direct conversion
> receiver, you will love this filter.The HI-PER-MITE is a much improved
> version of Dave's HI-PER Audio Filter circuit that was published in the May
> 1994 issue of 73 magazine. If you wish to learn more about the genesis of
> the HI-PER Mite, and learn about important audio filter design parameters,
> click on the original 73 article link in the documentation section
> below.This low cost kit sacrifices nothing in the way of quality. It
> features a high quality printed circuit board, low parts count, all through
> hole parts, and fast and easy building. It is an excellent kit for first
> time builders, and was chosen as the Buildathon kit for OzarkCon
> 2012. First time builders please note: This kit is not difficult to build,
> there are NO SMT parts and the parts are wide spaced on the board making
> installation easy.    Specifications and Design Features    Bandwidth:  200
> cycles at the -3 DB bandwith points.    Center Frequency:  The center
> frequency in the passband is 700 HZ    Signal Gain:  0 dB to 50 dB, user
> selectable    No Ringing or Buzz:  Nice, smooth audio - care has been taken
> in the design to eliminate ringing.    Versatile:  Drives speaker, earbuds,
> or headphones. Use standalone or install inside rig.    Audio Power:  500
> mW into 8 ohms, from 9v supply    DC Power:  5 to 13 VDC at less than 15
> mA    NO SMT Parts:  All through hole parts..    NO Toroids:  There are no
> toroids to wind, special circuits simulate them.    PCB:  High Quality,
> silk screened, two sided 2.2"x1.5" printed circuit
> board.    Documentation    Assembly Manual
> <http://www.4sqrp.com/kits/filter/cwfiltermanual4.pdf>    Parts List
> <http://www.4sqrp.com/kits/filter/cwfilterpartslist5.pdf>    Assembly
> Manual in Spanish
> <http://www.4sqrp.com/kits/filter/cwfiltermanual4_es.pdf> Translation by
> Jon Iza EA2SN, thank you Jon.    Parts List in Spanish
> <http://www.4sqrp.com/kits/filter/cwfilterpartslist4_es-1.pdf> Translation
> by Jon Iza EA2SN, thank you Jon.    Assembly Manual in Portugese
> <http://www.4sqrp.com/kits/filter/cwfiltermanual4_pt_br.pdf> Translation by
> Ed Freitas PS7DX, thank you Ed.    Schematic
> <http://www.4sqrp.com/kits/filter/cwfilterschematic3.gif>    Part Layout
> <http://www.4sqrp.com/kits/filter/cwfilterpartslayout.pdf>    Want a
> different center frequency? Here's How.
> <http://www.4sqrp.com/kits/filter/cwfilter_f_vs_r_table_2.pdf>    Center
> frequencies in Spanish
> <http://www.4sqrp.com/kits/filter/cwfilterfreq_es.pdf> Translation by Jon
> Iza EA2SN, thank you Jon.    Center frequency Calculator by Paul Jorgenson,
> KE7HR.
> <http://www.4sqrp.com/kits/filter/hpmfrequencycalculation.xls>    AA7EE
> Dave Richard 's incorporation into a DC receiver.
> <http://aa7ee.wordpress.com/2012/07/27/using-the-nm0s-hi-per-mite-filter-from-4sqrp-to-make-a-simple-40m-dc-cw-rx/>  Posted
> with permission, thanks Dave.    AA7EE Dave Richard's YouTube video of the
> Hi-per-Mite in action. <http://www.youtube.com/watch?v=jc7e9VYgubk>  Posted
> with permission, thanks Dave.    BX2ABT Hans Fong's You Tube Video Review
> <http://www.youtube.com/watch?v=Pk_GFJsux24&feature=plcp> posted here with
> permission.  Thanks Hans.    75 wpm dit performance by Chuck Vaughn, AAØHW
> <http://www.4sqrp.com/kits/filter/cwfilter_75wpm_dit_performance.pdf> posted
> here with permission.  Thanks Chuck.    Audio Bandpass Test by Chuck
> Vaughn, AAØHW
> <https://soundcloud.com/chaseology/hi-per-mite-audio-bandpass> This is an
> audio file and a must listen,  Thanks Chuck.    K9PL's Review
> <http://www.4sqrp.com/kits/filter/k9yatelegraphfeb2013hpm.pdf> in the K9YA
> Telegraph  <http://k9ya.org/> (posted here with permission)  Thank you
> Philip.    NMØS Original article in 73 Magazine
> <http://www.archive.org/stream/73-magazine-1994-05/05_May_1994#page/n11/mode/2up>  click
> to turn the pages.    Photo Page
> <http://www.4sqrp.com/kits/filter/cwfilterphotopage.html>    Electronics
> 2000's Excellent Capacitor Identification Page
> <https://www.electronics2000.co.uk/calc/capacitor-code-calculator.php>
> Posted with permission.    Electronics 2000's Excellent Resistor Code
> Graphic Calculator
> <http://www.electronics2000.co.uk/calc/resistor-code-calculator.php>
> Posted with permission.*
>
> 73
> DR
> N1EA
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> =30=
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