[CW] NM0S - HyperMite 200 Hz Audio Filter - NO RINGING!
sbjohnston at aol.com
sbjohnston at aol.com
Thu Mar 24 13:29:44 EDT 2022
In my little business "AF4K Crystals", I have learned that shipping/handling international orders is becoming more difficult and costly lately. It was so bad at first I did not want to do any international business, but in the "ham spirit" I have worked out a manual process for international orders manually by email and PayPal rather than through my web-store. The cost and hassle is not too bad this way. The time in transit is usually several weeks.
Petr, if you would like one or more of those filter kits, send me an email to orders at af4k-crystals.com. I can work up what it would cost for me to buy one for you and re-ship it to you using my system. And then give you a total that you could send to me by PayPal.
Steve WD8DAS
sbjohnston at aol.com
http://www.wd8das.net/http://af4k-crystals.com
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-----Original Message-----
From: Petr Ourednik <indians at xsmail.com>
To: cw at mailman.qth.net
Sent: Thu, Mar 24, 2022 8:03 am
Subject: Re: [CW] NM0S - HyperMite 200 Hz Audio Filter - NO RINGING!
#yiv9572526940 p.yiv9572526940MsoNormal, #yiv9572526940 p.yiv9572526940MsoNoSpacing{margin:0;}Thanks for posting.
No longer interesting as US Orders only...:(
73 - Petr, OK1RP
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What could be easier..? ¯∖_(ツ)_/¯
On Thu, Mar 24, 2022, at 12:45 PM, Stan Levandowski wrote:
I built one and I think it's fabulous.
Stan WB2LQF
On Thu, Mar 24, 2022 at 1:50 AM Walter - K5EST <walter.k5est at gmail.com> wrote:
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
Does anyone have one of these?
If so, do you like it?
| HI-PER-MITE
An Active Audio CW Filter
Designed by
David Cripe, NMØS
|
| Click for larger image.
|
Kitted and Offered For Sale By The Four State QRP Group
The 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
Parts List
Assembly Manual in Spanish Translation by Jon Iza EA2SN, thank you Jon.
Parts List in Spanish Translation by Jon Iza EA2SN, thank you Jon.
Assembly Manual in Portugese Translation by Ed Freitas PS7DX, thank you Ed.
Schematic
Part Layout
Want a different center frequency? Here's How.
Center frequencies in Spanish Translation by Jon Iza EA2SN, thank you Jon.
Center frequency Calculator by Paul Jorgenson, KE7HR.
AA7EE Dave Richard 's incorporation into a DC receiver. Posted with permission, thanks Dave.
AA7EE Dave Richard's YouTube video of the Hi-per-Mite in action. Posted with permission, thanks Dave.
BX2ABT Hans Fong's You Tube Video Review posted here with permission. Thanks Hans.
75 wpm dit performance by Chuck Vaughn, AAØHW posted here with permission. Thanks Chuck.
Audio Bandpass Test by Chuck Vaughn, AAØHW This is an audio file and a must listen, Thanks Chuck.
K9PL's Review in the K9YA Telegraph (posted here with permission) Thank you Philip.
NMØS Original article in 73 Magazine click to turn the pages.
Photo Page
Electronics 2000's Excellent Capacitor Identification Page Posted with permission.
Electronics 2000's Excellent Resistor Code Graphic Calculator Posted with permission.
73
DR
N1EA
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