audio recording on IC -help wanted

[Dave Platt]

Yes. Thank you very much for your idea. I think the split arrangement is
wonderful.

Do you think I can use the rechargable-battery for this project ?

Depending on what type of rechargeable battery you select... yes, you
can probably use one. As I mentioned, there are tradoffs between the
different types (weight, energy storage capacity, ease of charging)
and you'll have to evaluate them based on your needs.

But I have no idea to use the Solar Panel to recharged the battery ? In the
market, I think there is some solution. Isn't it ?

Most companies which sell solar panels, will also sell "charge
controllers" intended for charging 12-volt lead-acid batteries.

There are also solar panel / charger systems designed for charging
NiMH cells. Google for "solar battery charger". There's probably an
off-the-shelf solution which will meet your needs.

--
Dave Platt <dplatt@radagast.org> AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

 

[Scott Seidman]

JW <none@dev.null> wrote in news:347u84d103avl2p4ppoej6404qigf95ius@
4ax.com:

where do you get your wattage figures?

I^2*R would be my guess.

--
Scott
Reverse name to reply

 

[David Lesher]

Gustavo Raush <gustavo.raush@upc.edu> writes:

Hi:

Someone could address how can I solve the mechanical/electrical problem
to measure temperature from 20 thermocouple set into a 3 litre rotating
tank which contains a electrically heated water?.

Why are you using thermocouples? I'd look at RTD's, or National's
line of sensors [LM35, I think], and some kind of scanner-mux.
The slip rings could provide power and they or RF the data out.

--
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

 

[GregS]

In article <4898CBEA.CB074A4F@hotmail.com>, Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote:

".rhavin grobert" wrote:

could someone please recommend some alternatives for those chips:

TL 074CN
TL 072CP

i'd like to have some chips that have as few noise as possible. I dont
care if i have to spend some dollars for a chip, i want them to be pin-
compatible and nearly without noise. any suggestions?

Depends if the circuit needs the minute input current of bi-fet op-amps.

There's no shortage of really quiet bipolar ones at sensible prices.

Graham

I would think it depends on the circuit whether a bipolar would work. OPA4134 is a good bifet,
but you just can't expect it to work if you don't know the circuit. Power supply requirments
are essential. Then there's the LME49740.

greg

 

[GregS]

In article <g7c8q0$5nf$1@usenet01.srv.cis.pitt.edu>, zekfrivo@zekfrivolous.com (GregS) wrote:

In article <4898CBEA.CB074A4F@hotmail.com>, Eeyore
rabbitsfriendsandrelations@hotmail.com> wrote:


".rhavin grobert" wrote:

could someone please recommend some alternatives for those chips:

TL 074CN
TL 072CP

i'd like to have some chips that have as few noise as possible. I dont
care if i have to spend some dollars for a chip, i want them to be pin-
compatible and nearly without noise. any suggestions?

Depends if the circuit needs the minute input current of bi-fet op-amps.

There's no shortage of really quiet bipolar ones at sensible prices.

Graham


I would think it depends on the circuit whether a bipolar would work. OPA4134
is a good bifet,
but you just can't expect it to work if you don't know the circuit. Power
supply requirments
are essential. Then there's the LME49740.

greg

I don't know why, but I was assuming audio applications. There are all kinds
of applications that need to be fit into the mix. Is this for instrumentation
and what is the circuit ?

greg

 

[GregS]

In article <g7c8vr$5nf$2@usenet01.srv.cis.pitt.edu>, zekfrivo@zekfrivolous.com (GregS) wrote:

In article <g7c8q0$5nf$1@usenet01.srv.cis.pitt.edu>, zekfrivo@zekfrivolous.com
(GregS) wrote:
In article <4898CBEA.CB074A4F@hotmail.com>, Eeyore
rabbitsfriendsandrelations@hotmail.com> wrote:


".rhavin grobert" wrote:

could someone please recommend some alternatives for those chips:

TL 074CN
TL 072CP

i'd like to have some chips that have as few noise as possible. I dont
care if i have to spend some dollars for a chip, i want them to be pin-
compatible and nearly without noise. any suggestions?

Depends if the circuit needs the minute input current of bi-fet op-amps.

There's no shortage of really quiet bipolar ones at sensible prices.

Graham


I would think it depends on the circuit whether a bipolar would work. OPA4134
is a good bifet,
but you just can't expect it to work if you don't know the circuit. Power
supply requirments
are essential. Then there's the LME49740.

greg

I don't know why, but I was assuming audio applications. There are all kinds
of applications that need to be fit into the mix. Is this for instrumentation
and what is the circuit ?

One big problem with the internet, unlike books, data disapears if
its not current.

greg

 

[GregS]

In article <4899DE4B.9DC0EFC3@hotmail.com>, Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote:

GregS wrote:

I don't know why, but I was assuming audio applications.

That's what the TL07x series was designed for after all.

Graham

I have seen the TLO7x series in many applications.

For a long time I was bent on getting a TLO75 replacement. I guess
I got over it.

greg

 

[GregS]

In article <25c4a098-6080-4ea7-9cb1-a21d2215ef22@a70g2000hsh.googlegroups.com>, ".rhavin grobert" <clqrq@yahoo.de> wrote:

On 7 Aug., 14:19, Eeyore <rabbitsfriendsandrelati...@hotmail.com
wrote:
".rhavin grobert" wrote:
zekfr...@zekfrivolous.com (GregS) wrote:
zekfr...@zekfrivolous.com (GregS) wrote:
Eeyore wrote:

".rhavin grobert" wrote:

could someone please recommend some alternatives for those chips:

TL 074CN
TL 072CP

i'd like to have some chips that have as few noise as possible. I
dont
care if i have to spend some dollars for a chip, i want them to be
pin-
compatible and nearly without noise. any suggestions?

Depends if the circuit needs the minute input current of bi-fet
op-amps.

There's no shortage of really quiet bipolar ones at sensible prices.

Graham

I would think it depends on the circuit whether a bipolar would work.
OPA4134
is a good bifet,
but you just can't expect it to work if you don't know the circuit.
Power
supply requirments
are essential. Then there's the LME49740.

greg

I don't know why, but I was assuming audio applications. There are all
kinds
of applications that need to be fit into the mix. Is this for
instrumentation
and what is the circuit ?

it for an trace elliot bass amp. see circuit here:
http://tinyurl.com/5cyfcp
except ic1, all ops are TL074. i already replaced ic1 with an OPA 2134
(excellent result) but still have some great humming even when nothing
is connected to the input and mute is pressed. it's definitivle the
main board, not the AHA.
so i wanted to replace all those cheap noisy TL074 with the OPA 4134 -
unfortunately, the PA series (DIP14) is dead;-)

Changing op-amps won't affect humming one tiny bit. You have some other
problem. Could be all sorts
of things. Take it to a tech.

Graham

i am the tech! ;-) the humming is my 2nd problem, i first have to
solve the noise, and as the TL074 are pretty good noise generators, i
want to change them first to have a "clean hum" to start look for and
as the OPA 4134 is dead, i was looking for some other alternative.

You were given two models.

Put some sockets in there and compare.

greg

 

[GregS]

In article <489A4592.264B722F@hotmail.com>, Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote:

GregS wrote:

Eeyore wrote:
GregS wrote:

I don't know why, but I was assuming audio applications.

That's what the TL07x series was designed for after all.

I have seen the TLO7x series in many applications.

Oh yes, they're very versatile and not especially expensive, so well adaptable
to mnay circuits,
however that WAS their intended primary market.


For a long time I was bent on getting a TLO75 replacement. I guess
I got over it.

BTW, it's TL zero seven (five), not Oh (the letter) seven (five). Just being
pedantic ! ;~)

Graham

I have been saying TL O for 30 years. Now I stand corrected.

greg

 

[David Lesher]

Michael.C.Maguire@gmail.com writes:

I am looking for a source of type TM coax connectors and adapters.

Try the RF Connection. <http://www.therfc.com/>
--
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

 

[David Lesher]

Michael.C.Maguire@gmail.com writes:

I am looking for a source of type TM coax connectors and adapters.

Also, call William Perry Surplus...

William Perry Co in 702 (Rear) Beechwood Rd, Louisville, KY, 40207 (502) 893-8724, FAX (502)
893-9220 Eastern Time
--
A host is a host from coast to coast.................wb8foz@nrk.com
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

 

[ian field]

"the dipshit" <sgonedes@comcast.net> wrote in message
news:868wtx3mc1.fsf@smtp.comcast.net...

Hello, I am wondering if anyone knows the pin layout for a l7812acv cc077
v6
march 819 and a l7912acv gk243 vw chn 734. The products where purchased
via
newark.com from ST electronics. I checked the datasheets and the three
that
I have read all provide different pin layouts. I like to be sure that I
get
the pins right before I start pulling from the transformer - it's just a
minor issue but the koreans TL431 datasheet is much different than the
ones
that are available to US citizens.

As others have pointed out the 78xx and 79xx regulators have different
pinout also the TL431 is an adjustable zener not a voltage regulator.

 

[Bobby]

"Steve" <steve@nomail.net> wrote in message
news:v2clc4tbttcr0rg3h0cp8qpgsit63gr7cv@4ax.com...

I'm seeking an LED with no emission beyond (longer than) 480 nm.
It's best if it was eye-safe so as little UV emission as possible is
desired (> 400 nm ?). The few blue led's I've come across with peak
or dominant wavelengths of 430 nm have very wide spectra extending
beyond 480 nm.

Construct a cct that will turn the LED off when a freq > 480nm is reached

 

[Phil Allison]

"Percival P. Cassidy"

My mother-in-law spilled something on the handset of her CrystalTone
amplified telephone, and the outgoing volume level is now pathetic; i.e.,
the people she calls can hardly hear her, even with the "boost" button
pressed.

The mic element looks pretty much the same as the electret ones sold by
Radio Shack, but I cannot detect a sufficient polarizing voltage for an
electret -- just 0.7V.

** There is no " polarising " voltage for an electret mic - the electret
material inside provides the static field for the mic to work.

The internal FET pre-amp needs a DC supply of a few volts, but this is fed
to the capsule via a resistor of a few thousand ohms.

So the voltage on the mic may well be as low as 0.7 volts in some examples.

See:

http://www.hosiden.co.jp/web/english/web/products/pdf/e_on06_mic.pdf



...... Phil

 

[TT_Man]

At these RF frequencies (about 340 MHz) do I need to have true electrical
contact between the plug and socket or is close proximity enough?

Would loose "hand tight" be sufficent?

Yep, for what you have in mind.

You can also, IIUC, get adapters to go on the end of the F plug and turn
it into "push on". Which will probably give a more reliable result as
"loose hand tight" could very easily turn into "fallen off -lying on the
floor".

--
Sue

Sorry, Sue, it won't be more reliable, just very convenient if you are
continually removing/replacing F connectors into various pieces of
equipment......... By your reasoning, then both will fall off The push on
F connector adapter is very prone to falling out of the back of whatever
it's connected to....... but boy, is it handy

 

[Tim Perry]

"Peto" <peto@invalid.com> wrote in message
news:Xns9B1A7EBD9C40B37E1A@unknown.sj.astraweb.com...

I'm in the UK. I have the usual F-series connector on the coax
entering my cable modem.

http://www.newtechindustries.com/newtech/catalog/images/200-045.jpg

--------

I need to remove the connector every now and then so I lubed the
threads with a smear of vaseline.

At these RF frequencies (about 340 MHz) do I need to have true
electrical contact between the plug and socket or is close proximity
enough?

Would loose "hand tight" be sufficent?

Grease should only be used when making a weather tight seal. i.e. outdoors.
Typically a silicon sealer on 'N' connectors.

Grease is not commonly used on F connector threads. Some weather tight
models exude a sealer when crimped... but not on the threads.

Hand tight is insufficient in this case because one of tech support's first
questions is invariably "is your cable firmly attached" (I think it's on the
cue card).

Likewise any modification or adaptor you add will bear the brunt of blame in
any "discussion" with tech support or field service.

Constant plugging and unplugging of a F connector is not recommended because
the jack is likely to wear out making the center conductor connection
intermittent.

 

[Tim Perry]

"GoldIntermetallicEmbrittlement"
<GoldIntermetallicEmbrittlement@youdontknowjack.org> wrote in message
news:b2ttc4ph6l9acth9m4de75i9lskcts0bgo@4ax.com...

On Mon, 15 Sep 2008 17:30:23 -0400, "Tim Perry"
timperry@nospammeadelphia.net> wrote:

Grease is not commonly used on F connector threads. Some weather tight
models exude a sealer when crimped... but not on the threads.


Not true. There are several cities where the cable contractors followed
the CORRECT methodology of SEALING their fittings with an
anti-oxidant/moisture barrier.

You have a choice between conductive gunk which will tend to short out the
connection or non-conductive gunk which will tend to block the flow of
electrons where you would like them to flow. Take your pick. I pick neither.

Time Warner in new York picks neither also, as least as far as far as indoor
instillations go.

Given the OP's constant unplugging of the cable I doubt oxidization will
ever be a problem for him.

 

In alt.engineering.electrical Steve <80977969755483@mail2me.net> wrote:

| "Peto" <peto@invalid.com> wrote in message
| news:Xns9B1A7EBD9C40B37E1A@unknown.sj.astraweb.com...
|> I'm in the UK. I have the usual F-series connector on the coax
|> entering my cable modem.
|>
|> http://www.newtechindustries.com/newtech/catalog/images/200-045.jpg
|>
|> --------
|>
|> I need to remove the connector every now and then so I lubed the
|> threads with a smear of vaseline.
|>
|> At these RF frequencies (about 340 MHz) do I need to have true
|> electrical contact between the plug and socket or is close proximity
|> enough?
|>
|> Would loose "hand tight" be sufficent?
|
| Hand tight is sufficient, yes. Its rare I would tighten them up any more
| than hand tight for most jobs,

Tell that to the cable guy. They always tighten those things to the extreme.
Maybe that's a good thing outside. But I've had to use big wrenches to get
them off after the cable guy leaves. Maybe they think its a means to keep
me from using a pirate box?

--
|WARNING: Due to extreme spam, googlegroups.com is blocked. Due to ignorance |
| by the abuse department, bellsouth.net is blocked. If you post to |
| Usenet from these places, find another Usenet provider ASAP. |
| Phil Howard KA9WGN (email for humans: first name in lower case at ipal.net) |

 

In uk.telecom.broadband Michael A. Terrell <mike.terrell@earthlink.net> wrote:

Blarp wrote:

On Mon, 15 Sep 2008 12:27:32 +0100, Peto <peto@invalid.com> wrote:

I'm in the UK. I have the usual F-series connector on the coax
entering my cable modem.

http://www.newtechindustries.com/newtech/catalog/images/200-045.jpg

--------

I need to remove the connector every now and then so I lubed the
threads with a smear of vaseline.

At these RF frequencies (about 340 MHz) do I need to have true
electrical contact between the plug and socket or is close proximity
enough?

Would loose "hand tight" be sufficent?

In the lab I used to check various sat-tv receivers. On the end of the
sat feed we had an F connector with a special connector screwed in -
it was spring loaded with a solid smooth centerpin. It could be
pushed on and off without actually using the threads.

No idea what it was called, but it was a stock item at the time.


That is a 'G' connector, and is intended for test only. They do not
meet the FCC requirements for CATV systems.

So what, this is a UK group!

--
Chris Green

 

[Tim Perry]

Seeing your posts here in the past, I know that is not true, therefore,
you must have latched on to some lame urban myth. What you should have
relied on is your common sense.

It seem I have made an error. I failed to notice this crosposted.