[Elecraft] Sorta OT - assistive technology assistance needed

[Charlie T]

Hmmm,  and here I thought it meant "Old Timer", since that really relates to me.
Of course, "Off Topic "does too

Chas


-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Walter Underwood
Sent: Wednesday, January 09, 2019 11:59 PM
To: Elecraft at mailman.qth.net
Subject: Re: [Elecraft] Sorta OT - assistive technology assistance needed

Funny, I just realized I was misreading “OT” as Occupational Therapy. Our son just finished OT grad school and is studying for the board. Of course, assistive tech is a big part of occupational therapy.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Jan 9, 2019, at 5:42 PM, Dave Fugleberg <dave.w0zf at gmail.com> wrote:
> 
> I usually like to build stuff when I can, but I have to agree with the 
> others who suggested a commercial mixer. They are cheap and work well.
> I recently bought a small behringer USB mixer for under 50 bucks for a 
> project at work. It acts as a USB sound card, so you can mix audio to 
> or from the PC with other sources. You can adjust levels, 
> equalization, and position (left/right) for each source.
> I doubt one could homebrew an equivalent unit any cheaper.
> Good luck with your project! I’m sure your friend will appreciate it.
> 
> On Wed, Jan 9, 2019 at 5:30 PM Don Wilhelm <donwilh at embarqmail.com> wrote:
> 
>> James,
>> 
>> There was a homebrew headphone mixer in the ARRL Handbook sometime 
>> back
>> - simple, with op-amps to isolate the sources.
>> 
>> However with the advent of 2 to 5 input mixers being available in the
>> $20 to $60 range (see Amazon), it seems foolish to consider building 
>> your own - drilling the enclosure for the potentiometers and jacks, 
>> building the board, mounting things, etc. will take more time and 
>> effort than is reasonable unless you really like doing those things - 
>> and it will likely cost more than buying one already built.
>> 
>> The nice thing about a mixer is that you have control over the level 
>> of each input as well as an overall output volume control.
>> 
>> 73,
>> Don W3FPR
>> 
>> On 1/9/2019 6:03 PM, Richards wrote:
>>> Good Day.
>>> 
>>> Background:
>>> 
>>> I am assisting a blind ham who also suffers some hearing loss.  I 
>>> suggested using headphones to attenuate ambient environmental noise 
>>> as he operates.  The rub is, he needs to hear both his receiver AND 
>>> his computer (which provides audible feedback when logging contacts 
>>> and performing other duties.)
>>> 
>>> Question:
>>> 
>>> Can anyone suggest a simple passive (or active) mixer circuit schema 
>>> I can build for him to safely mix audio signals from his transceiver 
>>> headphone jack with audio signals from his computer sound card 
>>> headphone jack?
>>> 
>>> Discussion:
>>> 
>>> While there are multiple commercially produced simple and complex 
>>> mixing products in the marketplace, I would prefer to build an 
>>> inexpensive, small footprint solution we can easily incorporate in 
>>> his station to minimize clutter and the number of cables, jacks, and controls -- he
>>> contends with plenty of that already.   I suppose one solution might be
>>> a simple Y-adapter cable, but that seems too easy and I wonder 
>>> whether we should isolate the signals and/or grounds in some way?  
>>> (e.g., I do not wish to cause any "Pin-1" grounding issues, and 
>>> etc.)
>>> 
>>> Any traction?   Can anyone point me to an appropriate circuit schematic
>>> or other resource?  I don 't mind doing homework, and while I enjoy 
>>> building stuff and I am familiar with the basic concepts involved,  
>>> I could use a leg up on this project, especially to keep it simple 
>>> and easy to build and implement. Please reply off list if this 
>>> question is too far off topic, although I suspect there are many 
>>> hams who might be interested in the result, besides similarly situated disabled operators.
>>> 
>>> Thank you -  James - K8JHR -
>>> ---------------------------------------
>>> 
>>> 
>>> 
>>> 
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