I was rummaging through some of Steve Ciarcia’s old Circuit Cellar
Articles and stumbled onto the Audio-Video Multiplexer that uses this
chip. I haven’t had much luck in finding one, if they’re still even being
made. Any guidance would be appreciated. Thanks in advance!
31
Dec
Info on RCA 74LS22106 Crosspoint Switch
Shawn Call wrote:
> I was rummaging through some of Steve Ciarcia’s old Circuit Cellar
> Articles and stumbled onto the Audio-Video Multiplexer that uses this
> chip. I haven’t had much luck in finding one, if they’re still even being
> made. Any guidance would be appreciated. Thanks in advance!
Last time I looked, Digikey had them in their catalog. You might want
to look at Maxim’s databook, they have integral RF amps in some of
their multiplexers.
—
********************************************************************
The above opionions are personal and don’t necessarily reflect those
of the company I work for. Or the company I keep, for that matter.
********************************************************************
Shawn Call (ca…@butler.qrp.com) wrote:
: I was rummaging through some of Steve Ciarcia’s old Circuit Cellar
: Articles and stumbled onto the Audio-Video Multiplexer that uses this
: chip. I haven’t had much luck in finding one, if they’re still even being
: made. Any guidance would be appreciated. Thanks in advance!
Wrong part number. CD74HC22106 or CD74HCT22106, made by Harris now (who
bought RCA Semiconductor).
—
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I am trying to find a sensitive microphone or transducer suitable for
infrasound (<20 Hz) atmospheric sound measurements. Ideally I would like
to go down below .1 Hz but at a minimum I need it to go down to 2 Hz.
Thanks
John Moore
John Moore wrote:
> I am trying to find a sensitive microphone or transducer suitable for
> infrasound (<20 Hz) atmospheric sound measurements. Ideally I would like
> to go down below .1 Hz but at a minimum I need it to go down to 2 Hz.
> Thanks
> John MooreWhy not use an audio woofer as the transducer, and a low noise amp.
–
Gary L. Sanders, V.P. Engineering
Sanders Media Adventures, Inc.
Video Design Consulting
C-MAC/SMA Active, Hybrid Video Filters
http://ourworld.compuserve.com/homepages/gls_sma
phone/fax (408) 279-5118
John Moore asked about microphones at very low frequencies –
Look at the specs of pressure transducers. A SenSym differential
pressure transducer with a full scale range of about 0.01 atm has a
response time of 500 uSec. It might well handle 20 Hz.
–
Terry Montgomery
mo…@pitot.dfrc.nasa.gov
My opinion in my opinion.
You could consider the Motorola MPX10 or so series pressure
transducers. These will go down to DC, or as low as you want to
set the cutoff frequency, limited only by temp and amplifier drift.
Just port the other end of the differential transducer into a rigid
vessel, with a slow leak to equalise temp changes.
In article <31D96EC0.3…@anasazi.com>, John Moore
(j…@anasazi.com) writes: >I am trying to find a sensitive
microphone or transducer suitable for >infrasound (<20 Hz)
atmospheric sound measurements. Ideally I would like >to go down
below .1 Hz but at a minimum I need it to go down to 2 Hz. >
>Thanks
>John Moore
–
Regards,
Adrian Jansen ajan…@adelaide.DIALix.oz.au
Design Engineer J & K Micro Systems
PH (08) 271 4126
Microcomputer solutions for industrial control
John,
Our standard 1 inch and 1/2 inch microphones all go to below 2 Hz -2dB
Our preamps are <= -6 dB at 0.4 Hz with a 20 pF mic capsule
Check out our web site
http://www.industry.net/aco.pacific
or e-mail me your address and I will send you a complete catalog
John Moore <j…@anasazi.com> wrote:
>I am trying to find a sensitive microphone or transducer suitable for
>infrasound (<20 Hz) atmospheric sound measurements. Ideally I would like
>to go down below .1 Hz but at a minimum I need it to go down to 2 Hz.
>Thanks
>John Moore
Noland
Our Web Site — http://www.industry.net/aco.pacific
Manufacturers of Type 1 Measurement Microphones and Systems, ACOustic Interface(tm) Microphone Power Supplies , Simple Intensity(tm) Sound Intensity Probes, Very Random(tm) White/Pink Noise Generaors, SPL Calibrators, and Accessories for End-Users, OEM and Systems Interators.
Available in 1", 1/2 " and 1/4" versions the microphones offer frequency responses from 2 Hz to 120 kHz, Noise floors to 10 dBA, and Max Input levels in excess of 175 dBSPL. Extremely Stable, the Microphones are manufactured using Stainless Steel, Titanium and Nickel for the
diaphragm and body.Calibration is provided to International Standards. NIST Traceable recalibration services are available.
ACOusTalk(tm) an Internet Magazine offers a variety of technical tips, applications ideas, and technical articles. Users are encouraged to submit their contributions.
ACOustics Begins With ACO(tm)
Check out our WEB Site for measurement mics. Our microphones are flat
to 2 Hz and have predictable roll-ffs below that. The preamps go below
.5 Hz
Noland
John Moore <j…@anasazi.com> wrote:
>I am trying to find a sensitive microphone or transducer suitable for
>infrasound (<20 Hz) atmospheric sound measurements. Ideally I would like
>to go down below .1 Hz but at a minimum I need it to go down to 2 Hz.
>Thanks
>John Moore
Noland
Our Web Site — http://www.industry.net/aco.pacific
Manufacturers of Type 1 Measurement Microphones and Systems, ACOustic Interface(tm) Microphone Power Supplies , Simple Intensity(tm) Sound Intensity Probes, Very Random(tm) White/Pink Noise Generaors, SPL Calibrators, and Accessories for End-Users, OEM and Systems Interators.
Available in 1", 1/2 " and 1/4" versions the microphones offer frequency responses from 2 Hz to 120 kHz, Noise floors to 10 dBA, and Max Input levels in excess of 175 dBSPL. Extremely Stable, the Microphones are manufactured using Stainless Steel, Titanium and Nickel for the
diaphragm and body.Calibration is provided to International Standards. NIST Traceable recalibration services are available.
ACOusTalk(tm) an Internet Magazine offers a variety of technical tips, applications ideas, and technical articles. Users are encouraged to submit their contributions.
ACOustics Begins With ACO(tm)