audio recording on IC -help wanted

[Lostgallifreyan]

"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in
news:U8Kdnf_MLoDVZd_UnZ2dnUVZ_trinZ2d@earthlink.com:

Lostgallifreyan wrote:

"Phil Allison" <philallison@tpg.com.au> wrote in
news:6qe78iFc3jvpU1@mid.individual.net:



"Lostgallifreyan"


Someone need to deal with this evil psychotic prick severely.

And very soon.....






Man, I think I just graduated. >


Two more levels & he'll kill file you!

Nah, can't swear at a killfile. It's not as rewarding.

 

[Michael A. Terrell]

Lostgallifreyan wrote:

"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in
news:U8Kdnf_MLoDVZd_UnZ2dnUVZ_trinZ2d@earthlink.com:


Lostgallifreyan wrote:

"Phil Allison" <philallison@tpg.com.au> wrote in
news:6qe78iFc3jvpU1@mid.individual.net:



"Lostgallifreyan"


Someone need to deal with this evil psychotic prick severely.

And very soon.....






Man, I think I just graduated. >


Two more levels & he'll kill file you!



Nah, can't swear at a killfile. It's not as rewarding.

He hasn't replied to me in a long time.


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There are two kinds of people on this earth:
The crazy, and the insane.
The first sign of insanity is denying that you're crazy.

 

[maxi]

what are the data of IGBT Semikron :SKM158m010



Thanks

 

[Millwright Ron]

On Dec 12, 6:28 pm, "Michael A. Terrell" <mike.terr...@earthlink.net>
wrote:

Lostgallifreyan wrote:

"Michael A. Terrell" <mike.terr...@earthlink.net> wrote in
news:U8Kdnf_MLoDVZd_UnZ2dnUVZ_trinZ2d@earthlink.com:

Lostgallifreyan wrote:

"Phil Allison" <philalli...@tpg.com.au> wrote in
news:6qe78iFc3jvpU1@mid.individual.net:

"Lostgallifreyan"

Someone need to deal with this evil psychotic prick severely.

And very soon.....

Man, I think I just graduated. >

   Two more levels & he'll kill file you!

Nah, can't swear at a killfile. It's not as rewarding.

   He hasn't replied to me in a long time.

--http://improve-usenet.org/index.html

aioe.org, Goggle Groups, and Web TV users must request to be white
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There are two kinds of people on this earth:
The crazy, and the insane.
The first sign of insanity is denying that you're crazy.- Hide quoted text -

- Show quoted text -

Terrell

How is the tv repairman? I haven't seen much of your drivel lately.


If you are tired of that nasty taste in your mouth...Maybe you should
change jobs.

 

[Michael A. Terrell]

Lostgallifreyan wrote:

"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in
news:gPydnWCmjt8XbNrUnZ2dnUVZ_hmdnZ2d@earthlink.com:

http://www.keyelco.com/products/prod37.asp?SubCategoryID=24


"Available in Non-conductive Material"
Highly amusing. I was wondering what other kind they had in mind. >

You have to spell out EVERYTHING to purchasing departments. If you
didn't, they would find a good deal on conductive plastic caps then
complain that the battery vendor was shipping dead batteries.

Have you ever had to spend hours explaining why they can't just
substitute something with similar name? At one job they found some
molded inductors at a GREAT price. The 'Item Master' specified the only
brands and series that were acceptable. Their logic was that the cheap
part wasn't on the list, because it was 5% tolerance while the listed
inductors were all 10% tolerance, and that 5% was always better than
10%. The problem was, the inductance was right on the line between two
core materials. Some vendors used one, and the rest used the other. The
SRF went way down on the wrong core material, and that was what they
bought. They were used to decouple a RF buffer from the power supply.
The stage normally had a gain of around 10. The wrong coil dropped the
output to about .03 of the input.

OTOH, conductive plastic would be good on the battery connector of
new equipment, to protect it during shipment.


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There are two kinds of people on this earth:
The crazy, and the insane.
The first sign of insanity is denying that you're crazy.

 

[Lostgallifreyan]

"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in
news:6tKdnY6yjYhZldXUnZ2dnUVZ_hKdnZ2d@earthlink.com:

You have to spell out EVERYTHING to purchasing departments. If you
didn't, they would find a good deal on conductive plastic caps then
complain that the battery vendor was shipping dead batteries.

Cool. If I was the sale's rep on a job like that I'd risk my job having fun
with them, and advocate the durability of an all metal 'solution'. >

 

[jakdedert]

Lostgallifreyan wrote:

jakdedert <jakdedert@bellsouth.net> wrote in
news:zFa2l.9015$M01.8839@bignews3.bellsouth.net:

I don't have time to check (or recharge) used batteries.

No-one's time should be that important unless they're saving a life or
something. Time these devices were fitted with lithium ion batteries.
Changing out sets of those occurs less because the energy density is good,
there;s no 'memory effect' or other reason not to top up on demand, the cost
can be low enough to compete with Procells, and changing them is as fast, or
faster, given no fiddly pop-cap connector to mess with. And you top up your
batteries at night in a charger and in the morning you have lots of new
batteries. Their energy density is good enough that you'll likely get through
a day or more of the demands a microphone makes, so if time really IS si
desperately im,piortant that you think you can't find enough to charge a
battery, think again. It will save you more than it costs.

I'm talking about as many as 100 microphones.

I get paid for my time. Time to recharge and keep track of batteries on
the road is not cost effective vs. the cost of fresh alkalines. It'd be
nicer for the environment if that were not the case, but it's so. One
hour of my time buys a lot of batteries. An hour of my crew's time--who
would also have to wait around; and the truck driver's time--is even more.

The first couple of gigs that those batteries got packed up in a
discharged state, got shipped across the country--alternately frozen and
baked a few times--they'd need to be replaced. Often we finish a show,
toss everything back in the cases and leave. We get on a plane. The
gear goes by unheated truck. New cells--especially alkalines--travel
much better than discharged cells of other chemistries. Even assuming
no damage, often we need to toss things back together at the destination
and power up. Time to set up chargers and get everything topped off is
often not available. Used rechargables deteriorate over time
regardless, adding another time (and money) consuming task of monitoring
long-term condition of individual cells...several hundred of them.

The only serious obstacle is the possible lack of 9V PP3 shaped lithium ion
types. I don't think I've seen any yet. But a decent mic could use a DC-DC
converter and run off one or two standard CR123's just fine, and for a lot
longer too. The use of space for chemical reaction is far better in large
cells than groups of small ones.

The economy of labor is the most severely limiting factor. The
chemistry comes a distant second. The mics do contain DC-DC converters,
and will work pretty reliably down to almost zip. I never let them get
that far (well, it's happened, but extremely rarely).

It's somebody else's expense; but it's *my* reputation. The client
doesn't want to hear excuses when he/she gets up to speak and is
embarrassed by a dead microphone. His/her time and reputation is also
valuable--worth much more than a 9v battery.

All that said, last tour I did the mics all used AA's. I've got enough
used spares to keep my Maglight fired up for a year.

jak

 

[Charlie E.]

On Wed, 17 Dec 2008 11:54:41 -0600, Lostgallifreyan
<no-one@nowhere.net> wrote:

jakdedert <jakdedert@bellsouth.net> wrote in
news:zFa2l.9015$M01.8839@bignews3.bellsouth.net:

I don't have time to check (or recharge) used batteries.

No-one's time should be that important unless they're saving a life or
something. Time these devices were fitted with lithium ion batteries.
Changing out sets of those occurs less because the energy density is good,
there;s no 'memory effect' or other reason not to top up on demand, the cost
can be low enough to compete with Procells, and changing them is as fast, or
faster, given no fiddly pop-cap connector to mess with. And you top up your
batteries at night in a charger and in the morning you have lots of new
batteries. Their energy density is good enough that you'll likely get through
a day or more of the demands a microphone makes, so if time really IS si
desperately im,piortant that you think you can't find enough to charge a
battery, think again. It will save you more than it costs.

The only serious obstacle is the possible lack of 9V PP3 shaped lithium ion
types. I don't think I've seen any yet. But a decent mic could use a DC-DC
converter and run off one or two standard CR123's just fine, and for a lot
longer too. The use of space for chemical reaction is far better in large
cells than groups of small ones.

On my latest project, I have a BUNCH of wireless mikes that need both
AA and 9V batteries. I bought a charging station that can handle all
of them, and have a simple rule - after a meeting, you take out ALL
the batteries and put them in the charger. Since each meeting is
usually around 2 hours, it gets too confusing to do an every so often
replacement policy, esp. with non-rechargables.

Charlie

 

[Lostgallifreyan]

jakdedert <jakdedert@bellsouth.net> wrote in
news:Nxb2l.9033$M01.4938@bignews3.bellsouth.net:

It's somebody else's expense; but it's *my* reputation.

That's the point right there. if you want the privilege of the top slot, take
the responsibility. What gives you the right to think your precious time is
worth any more than mine or anyone else's? You have the time to write long
posts justifying your position on Usenet do get some damn rechargeables abd
be done with it. If you can organise a team of people, don't say you can't
organise a charging rota.

 

[Lostgallifreyan]

"Dave Plowman (News)" <dave@davenoise.co.uk> wrote in
news:500f3753f1dave@davenoise.co.uk:

Many pro RMs do use DC to DC convertors.

Good. I take the rest of th epoints, but the bottom line is that energy
density requirements are rising, and batteries of small cels are lunacy, it's
obviously poor spatial economy, so sorting THAT issue should be the priority.
The sooner microphone makers get demand for models that fix this the sooner
all the other issues will diminish. PDA makers have had to learn this, so it
should be easy, just copy best practise.

 

[Lostgallifreyan]

Charlie E. <edmondson@ieee.org> wrote in
news:ckhik45mhrico4dfq28k8e869rnhjugath@4ax.com:

On Wed, 17 Dec 2008 11:54:41 -0600, Lostgallifreyan
no-one@nowhere.net> wrote:

On my latest project, I have a BUNCH of wireless mikes that need both
AA and 9V batteries. I bought a charging station that can handle all
of them, and have a simple rule - after a meeting, you take out ALL
the batteries and put them in the charger. Since each meeting is
usually around 2 hours, it gets too confusing to do an every so often
replacement policy, esp. with non-rechargables.

Charlie

Lithium ion cells have an energy density so great that you DON'T have to work
on a 2 hour basis. Just put them in at the start of the day's work, then top
them up overnight. So long as you organise the changeover in a few minutes at
each day's end, no worries. But changing to one type of cell requirement will
help. If you chose mixed types, that's your choice. If you make it difficult
for yourself, it makes no sense to pass the costs on, they're still costs,
one way or another people want pay for taking on anyone's extra load.

Hopefully the number of Li ion types won't get out of hand, this is a chance
to fix a lot of problems, if most small stuff can use CR123A.

 

[Dave Plowman (News)]

In article <Xns9B77B6343D583zoodlewurdle@216.196.109.145>,
Lostgallifreyan <no-one@nowhere.net> wrote:

The only serious obstacle is the possible lack of 9V PP3 shaped lithium
ion types. I don't think I've seen any yet. But a decent mic could use
a DC-DC converter and run off one or two standard CR123's just fine,
and for a lot longer too. The use of space for chemical reaction is far
better in large cells than groups of small ones.

Trouble is the demand is for smaller and smaller units - yet as things go
digital power consumption increases. So to the best of my knowledge
there's no modern small RM pack that will give a long day's use without a
change on alkalines. I'd need a guaranteed life of 12 hours unless
changing the batteries is as easy as at present. And then there's the
capital cost of the LiIon types. The beauty of using stock sizes is they
can be bought anywhere in an emergency.

Many pro RMs do use DC to DC convertors.

--
*I couldn't repair your brakes, so I made your horn louder *

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.

 

[Lostgallifreyan]

jakdedert <jakdedert@bellsouth.net> wrote in
news:Nxb2l.9033$M01.4938@bignews3.bellsouth.net:

The first couple of gigs that those batteries got packed up in a
discharged state, got shipped across the country--alternately frozen and
baked a few times--they'd need to be replaced. Often we finish a show,
toss everything back in the cases and leave. We get on a plane. The
gear goes by unheated truck. New cells--especially alkalines--travel
much better than discharged cells of other chemistries. Even assuming
no damage, often we need to toss things back together at the destination
and power up. Time to set up chargers and get everything topped off is
often not available. Used rechargables deteriorate over time
regardless, adding another time (and money) consuming task of monitoring
long-term condition of individual cells...several hundred of them.

This is interesting. I think Li ion batteries will solve most of it though.
I've used them in a flashlight and GPS and PDA used in freezing conditions,
and they last for days in all but the PDA. Their self-dischare rates are
extremely low, and they've been charged so many times that no other
rechargeable would still be usable, and NiMH would have failed several times
in the time I've used the lithium rechargeables.

Don't underestimate the importance of the chemistry of the battery vs the
economy of labour. In this case the energy density means less weight to
carry, less time between changes, more stable output, no concern for when you
can or cannot charge a cell. Most people's logic on primary vs secondary
cells derives from times when NiCD or NiMH was all there was at best.
Compared to an alkaline, I agree than those are very poor, especially in PP3
sizes, but lithium changes this so much, it's better than either. It's worth
rethinking to take advantage of that. Beats leaving a useless trail of used
chemistry too.

 

[jakdedert]

Lostgallifreyan wrote:

"Dave Plowman (News)" <dave@davenoise.co.uk> wrote in
news:500f576701dave@davenoise.co.uk:

Trouble with rechargeables is they don't maintain the same performance
throughout their life - which makes knowing when they must be changed
rather hit or miss. Plus the fact that most give little warning of running
out - unlike an alkaline - due to the different voltage discharge curves.
So what might be a benefit on a high power demand device like a drill etc
is a liability on a low current one.

Add to that, that the battery condition indicators on pro-audio RF units

are calibrated to the alkaline curve. Not only would any
current-chemistry rechargeable drop off suddenly, it would do it with
practically no indication from the meter. Alkalines, with the proper
metering, will give a visual indication of failing condition *long*
before there's any audible consequence.

<Snipped a bunch of technically feasible--but absolutely
impractical--chatter>

If reliability is critical, run their first couple of charges in a non-
critical situation. Label them with coloured electricians' insulating tape to
code them, or whatever it takes to identify and organise. If I had to put
batteries in 100 microphones I'd rather use lithium ions than alkalines given
what I've seen of them so far on similar steady loads in critical situations
(hours in cold and darkness with a flashlight making the difference between
safety and injury).


I'm sorry, but if you were in the situation, you wouldn't.

You'd be too busy to ride herd on a bunch of rechargeable batteries, in
order to save something like 2% of the total expendables budget...if
that. In the process you would more than offset any possible savings
with significant increases in labor costs. A hundred batteries wouldn't
even buy an hour of my show rate. I usually turn in overtime on show
dates...so it would take over a hundred and fifty to even come close.

Batteries are simple. I want to open a box, put in a battery, turn on
the mic and be done (fifty or a hundred times a day). There are far too
many other things to do.

jak

 

[Lostgallifreyan]

jakdedert <jakdedert@bellsouth.net> wrote in
news:8Lj2l.9742$UI2.8161@bignews6.bellsouth.net:

Batteries are simple. I want to open a box, put in a battery, turn on
the mic and be done (fifty or a hundred times a day). There are far too
many other things to do.

Well, it's a good thing that a large section of the energy industry doesn't
agree. Even though it will still sell a technology that works and is
demanded, it puts greater efforts into finding better ones. The question is
how long will some people hold out before realising that a better one is
there for them to take. I'm not a rapid mover to new things, but I know the
advantages of lithium ion cells when I see them.

As for the metering in microphones that you mentioned, that's easy, IF the
makers see fit to deal with it. Li ion batteries aren't as flat in curve as
NiCd and NiMH, so if those have been handled in devices where metering was
needed, Li ion cells can. I think you're putting obstacles in the way. More
to the point, you're convinced that your time is so important that it's fine
to leave others to clear up the mess. People are becoming generally less
tolerant of this. There are always things to do. That's why people don't want
to spend it clearing up after someone else who won't change.

 

[Michael]

chrisj.doran@proemail.co.uk wrote:

On 16 Dec, 19:05, Tim Wescott <t...@seemywebsite.com> wrote:
DaveC wrote:
I want to keep some NiMH rechargeable 9v batteries in my tool bag (well, my
meter bag, actually). I am currently running a double loop of electrical tape
around the entire battery to insulate the terminals.

I'd like to use something more durable (one battery has had a terminal peek
through the tape) and was thinking about something like a battery terminal
connector but made of insulating material like nylon (probably of some
cheaper plastic).

Does such a thing exist? I did web searches, but maybe my terminology isn't
spot-on...

Start harvesting the snap-on battery cords from dead electronics. Cut
the wires off short (preferably inside the vinyl housing a bit). Snap
them on -- there you are!

You can buy such cords, but the cheapest/fastest solution is to take
apart a dead battery and tape up the back side, with a bit of plastic
behind to prevent rubbing through -- the battery may have this anyway.

In my impoverished schooldays, no battery was ever thrown away without
salvaging the connectors.

Chris

Absolutely. When I was in 7th grade (too many years ago!) a buddy showed me that method of getting
"free" 9v battery connectors, and ever since then I've never tossed a 9v without snatching its top.
I have many dozens of the buggers. Some years ago I sacrificed two by smearing silicone sealant
over the top (non-snap side) of contacts. I use them to do exactly the thing that the OP wants.

 

[Dave Plowman (News)]

In article <Xns9B7B975B7ABBBzoodlewurdle@216.196.109.145>,
Lostgallifreyan <no-one@nowhere.net> wrote:

In your opinion maybe. Professionals in the sound industry use
quality replaceable batteries, they are reliable - reliability means
_everything_ when a show (or your job) is at stake.


Lame. I keep hearing this silly excuse. This is consumer high-street
shop level thinking. The whole audio industry is riddled with it. For
decades dull black boxes have been shifted with the letters PRO on
them, regardless of how tacky they are, never has an industry blown its
trumpet so loudly.

Err, we're talking radio mics here. And pro ones are in a different league
to the low end stuff. They have to be rugged - and possible to fix if
damaged.

Do they use alkalines in space?

That's a stupid comparison - you'd have to take all those needed with you.
Plus the fact that 'space' has easy and constant access to a source of
power - the sun. Unheard of in the UK. ;-)

In oil drilling gear that has to go down deep in the earth and stand
vibrations?

They use PP3s there? Or AAs? AAAs?

In pacemakers?

Cost almost certainly doesn't matter there.

In aircraft black boxes?

Any battery used in that will be a backup.

Ok, maybe they do, sometimes, but there are lot of battery technologies
reached for when mission critical reliability is needed, and I bet most
industries don't reach for alkalines.

Their requirements are likely different. With radio mics you need a
cost/performance/reliability compromise.

Oil wells reach for lithium thionyl chloride, for
example. If long life primaries with extreme reliability are important
to people who are so up themselves with their 'reputation' and their
expensive hours that are worth SO many batteries, why not buy those?

I can give a reason. Very high capacity (and cost) primary cells might be
ok where you can log the usage. Unfortunately in the film etc world this
isn't always possible - one person might be looking after dozens of the
things. So fitting brand new ones with a reasonable life is simply more
convenient - you change them all at natural break times. That might be
once a day - or twice. With some, three times. Most give a life of at
least 5 hours.

Instead of clinging to one aging method that is highly polluting, use
some imagination and explore what REAL professionals with mission
critical requirements are up to. Compared to those, the industry that
makes such a song and dance of putting microphones in front of
delegates at conferences is like the hairdressers and telephone
sanitisers that Douglas Adams whimsically crashlanded on some planet
along with a captain with a penchant for bathtubs and rubber ducks. >
While we need entertainment and communication to make life worth
living, people used to get by till very recently without having to use
so many mics to feel important or get themselves heard.

Thanks for showing you don't have any understanding of this industry.

Think I met you once in the form of a large middle aged lady. I was
working on a live TV current affairs program. Went to clip a mic on her
and she said 'I don't need that, I have a perfectly good voice'

Get a grip. This thread has wound its way round this silly circle for
too long, and I should never have got into it myself, but I have, and
this is my parting shot. I'll read the flames if I have the patience,
but I will try not to get further involved.

It's as well to understand the problems in an individual industry before
trying to apply fixes from another. TV is full of kids just out of college
trying to do just that - and failing miserably. I've seen hundreds come
and go...

I admit to using a few alkalines at times, but either where laziness is
more attractive than performance, or where nothing else fits yet. If I
could change all to Li-ion or lithium thionyl chloride types, I would.
Specifically, the only time I justify an alkaline is when I need a PP3
that is ready to use, between long periods of disuse. For anything
else, I find another way.

One of the most important things with some RMs is size - if they have to
be concealed on the body. Better batteries allow smaller units. But good
RMs are extremely expensive and none will junk good ones just for this.

--
*Change is inevitable, except from a vending machine.

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.

 

[jakdedert]

Lostgallifreyan wrote:

"Ron(UK)" <ron@lunevalleyaudio.com> wrote in
news:HKadnVPgwPOru9PUnZ2dnUVZ8rKdnZ2d@bt.com:

In your opinion maybe. Professionals in the sound industry use quality
replaceable batteries, they are reliable - reliability means
_everything_ when a show (or your job) is at stake.


Lame. I keep hearing this silly excuse. This is consumer high-street shop
level thinking. The whole audio industry is riddled with it. For decades dull
black boxes have been shifted with the letters PRO on them, regardless of how
tacky they are, never has an industry blown its trumpet so loudly.

You obviously know nothing of which you speak. You wouldn't last a day
in this business. Why do you feel competent to judge it?

jak

 

[Michael A. Terrell]

Lostgallifreyan wrote:

Do they use alkalines in space?

One thing they don't use is Lithium. The equipment we supplied had to
be modified to eliminate the 2K*8 lithium battery backed SRAM. The
equipment was for use in the crew quarters of the Space Station. We used
some 'CapStore' SRAM that is apparently no longer in production.

Generally, they use specially designed Ni-cads in space vehicles.
That is where the myth of Ni-cad 'memory' came from.


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http://improve-usenet.org/index.html

aioe.org, Goggle Groups, and Web TV users must request to be white
listed, or I will not see your messages.

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your account: http://www.usenettools.net/ISP.htm


There are two kinds of people on this earth:
The crazy, and the insane.
The first sign of insanity is denying that you're crazy.

 

[Lostgallifreyan]

"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in
news:dMmdndGkyPURjdLUnZ2dnUVZ_gCdnZ2d@earthlink.com:

Lostgallifreyan wrote:


Do they use alkalines in space?


One thing they don't use is Lithium. The equipment we supplied had to
be modified to eliminate the 2K*8 lithium battery backed SRAM. The
equipment was for use in the crew quarters of the Space Station. We used
some 'CapStore' SRAM that is apparently no longer in production.

Generally, they use specially designed Ni-cads in space vehicles.
That is where the myth of Ni-cad 'memory' came from.

Ok. Explosion risk? (Or perhaps noxious and corrosive fumes in enclosed small
volumes, most likely, I guess, if they rupture.) I remember such batteries
appearing on surplus output long before most people even heard of lithium
batteries, so I guess they were being rejected from somewhere. They were fine
though, for me. Still got some even now. Bit of electrode plating requiring a
very short burst discharge to wake them, and off they go like the Energizer
bunny, but slowly, not designed for high peak loads..

The reason for last night's rant is that I see so much dismissal of other
technologies, and when people talk of what amounts to a claim for mission
critical performance, they should continue to explore other similar
requirements, see what they do. It's changing all the time. Lithium based
battery tech is developing so fast that it's not sensible to dismiss it and
cling to something that is a (significant, granted) step up from the dry
cell. When I look at details on current lithium and Li-ion cells, I see
something that is ready now. Some basic calulations show that their cost per
unit time usable makes them similar to alkaline, with a quarter waste by
volume, maybe better, and a saving on changing times by same factor (not to
mention disruption of people who need to wear or carry those things with as
little disturbance as possible in the course of a day). Can't ignore stuff
like that. People staying with what they know while talking up the value of
their own jobs seem in as poor a position to judge new developments as I am
to judge their jobs... The only way they'll change that is if they explore
more than they dismiss, and I don't see that happening here despite all the
facts and figures trotted out.

Damn, there went my resolve not to post in this, but talking to someone who
makes sense to me more often than not is harder to resist than those who
would retort mainly because I ranted at them. And it's a very quiet night..


A thought I have about RF mics... what about the little 10 KHz induction
chargers used in toothbrushes? If they could be stacked in a case that had a
single source driving a coil in each cradle, the effort to maintain charges
need be no worse than that of collecting devices and putting them in the
case, a task no doubt already needed. If it is economic for cheap electric
toothbrushes it has to be viable for expensive RF microphones.