Chip with simple program for Toy

[BobGardner]

How about a 'personal amplifier'

http://www.seniorshops.com/minitech.html

 

[BobGardner]

And speaking of the
frequency range: I used to think that the 192 kHz sample rate
offered in modern sound cards was ridiculous, but now I can
finally see how that could be useful.
=======================

SEE how its useful? How about can you hear the difference? I'd say its moot if
you record at 24 bit 192KHz sample rate then burn a CD with 16 bit 44.1KHz. I
guess DVD has better fidelity than CD now, right?

 

[BobGardner]

Can someone please tell me if there's a small, *water proof* DC motor
available to buy which I can leave permanently outdoors?
=======================

Trolling motor is 12VDC and waterproof. Run it off a battery charger. That'll
keep the water moving!

 

[BobGardner]

Electronic Design Diagram must be drawn in Microsoft Visio
file format.

No fair. MS rigged visio so it wont run on 98. I cant afford $200 for a new OS
version. How about schematics in MS draw?

 

[BobGardner]

Also, is the "50 VMP" that follows the capactitance
rating sigificant?

You bet. I think its VNP 'volts non polarized'... its isnt electrolytic... and
its got to handle the peak to peak voltage from the amp... 200V would be better
for a big amp (+-100V)

 

[BobGardner]

when a current just starts flowing into a RL or RC circuit, how does
the voltage "know" that it should be increasing exactly 63% during
each time-constant period?
==================

The cap starts out discharged, so a lot of current flows at first, then less
and less and less as the voltage and charge builds up on the cap. Plot it...
charging toward 12 volts ... starts at 0, then half way to 12 would be 6, then
half way to 12 would be 9, then half way to 12 would be 10.5, then half way to
12 would be..... hey... it might not ever get there!

 

[BobGardner]

I need to determing how much electricity a solar water heater is
replacing.

The water heater is either on or off. If you could get a 220V clock, you could
gator clip that onto the heating element and see how many hrs a dat its
running. Quick... how many BTUs in a KWHR? ans: 3412

 

[Jamie]

well if its shielded then you should be ok how ever, most
cat 5 i used is not shielded but that doesn't mean you
don't have a good supply of the shielded type.


Rene wrote:

That is fine how ever, pulsing loads on the DC line could
induce cross talk problems in crappie communication cables like
CAT5 and the like over a long hall.


Even if the CAT5 cable is shilded?

 

[Jamie]

I guess working 21 years in a lab
performing Lost, Skin, Radiated, and velocity
tests in a work area that has made
electronic wire and cables for 50 years
isn't enough ?
To let you in on something, our
facility was one of the first to
start massive manufacturing of CAT 4,5
and the like along with the foam pairs
bundled with twisted pairs of control
wires etc...
high levels of DC currents pulsing
over long runs bundled in the same
race way with no form of EMF shielded
does un-balance the Twisted pairs there
by influencing the signal.



w_tom wrote:

Changing currents of how much will induce what frequency on
adjacent CAT5 wire? Junk science is widespread and prolific
when we forget to apply numbers to our theories. Please
provide numbers for these fields generated by changing loads
on a 12 VDC wire. With those defined fields, what sort of
voltage and current is induced upon twisted pair CAT 5 wire?
Anything is possible in a fiction world where we fear to
provide numbers. Numbers provide a perspective called
reality. What are those numbers?

Jamie wrote:

That is fine how ever, pulsing loads on the DC line could
induce cross talk problems in crappie communication cables like
CAT5 and the like over a long hall.

 

[John]

On 17 Oct 2004 13:00:22 -0700, jpatricks1@yahoo.com (Patrick) wrote:

I bought some color changing led's. It works well with 9v batteries
but when I got home and tried it with 12v (planning to use it on my
car) and a 750ohm resistor it just lit red and didnt change color.
Tried again with lower voltage starting at 1.5 gradualy moving up
without resistor... it changed color at 6v - and then burned! What am
I doing wrong? It worked well with the 9v battery so why did it burn
at 6v? Any ideas on how to get it to work?

Thank you very much and good day

LEDs are current-operated devices and need a limiting resistor to
prevent excessive current. Connecting the LED directly to a power
source is generally a recipe for failure...

The reason the LED worked at "9 volts" is that the battery is limited
in the amount of current it can deliver and the battery voltage
dropped when the LED was connected.

You need to limit the LED current to something around 20 ma
(milli-amps) for testing.

 

[Dbowey]

Jamie posted:

I guess working 21 years in a lab
performing Lost, Skin, Radiated, and velocity
tests in a work area that has made
electronic wire and cables for 50 years
isn't enough ?
To let you in on something, our
facility was one of the first to
start massive manufacturing of CAT 4,5
and the like along with the foam pairs
bundled with twisted pairs of control
wires etc...
high levels of DC currents pulsing
over long runs bundled in the same
race way with no form of EMF shielded
does un-balance the Twisted pairs there
by influencing the signal.

--

How about sharing some of that vast experience and tell us how induced voltage
unbalances a balanced cable pair by "influencing the signal." What work did
you do in that lab?

Don

--

w_tom wrote:

Changing currents of how much will induce what frequency on
adjacent CAT5 wire? Junk science is widespread and prolific
when we forget to apply numbers to our theories. Please
provide numbers for these fields generated by changing loads
on a 12 VDC wire. With those defined fields, what sort of
voltage and current is induced upon twisted pair CAT 5 wire?
Anything is possible in a fiction world where we fear to
provide numbers. Numbers provide a perspective called
reality. What are those numbers?

Jamie wrote:

That is fine how ever, pulsing loads on the DC line could
induce cross talk problems in crappie communication cables like
CAT5 and the like over a long hall.

 

[Jon Danniken]

"oddsod" wrote:

http://w1.706.comhem.se/~u70624934/

Brings a whole new meaning to "discrete components".

Jon

 

[Peter Lawton]

"BobGardner" <bobgardner@aol.comma> wrote in message
news:20041025192028.17053.00001819@mb-m26.aol.com...

when a current just starts flowing into a RL or RC circuit, how does
the voltage "know" that it should be increasing exactly 63% during
each time-constant period?
==================

Time itself is defined by the charging of the capacitor.
The real question is why a pendulum etc agrees with the charging.
Peter Lawton

The cap starts out discharged, so a lot of current flows at first, then
less
and less and less as the voltage and charge builds up on the cap. Plot
it...
charging toward 12 volts ... starts at 0, then half way to 12 would be 6,
then
half way to 12 would be 9, then half way to 12 would be 10.5, then half
way to
12 would be..... hey... it might not ever get there!

 

[Rich Grise]

On Mon, 25 Oct 2004 23:13:16 +0000, BobGardner wrote:

Electronic Design Diagram must be drawn in Microsoft Visio
file format.

No fair. MS rigged visio so it wont run on 98. I cant afford $200 for a new OS
version. How about schematics in MS draw?

Linux is free, and comes with Kivio, a free software knockoff of Visio.

That'd tweak their nose!

Have Fun!
Rich

 

[Rich Grise]

On Mon, 25 Oct 2004 22:56:43 +0000, BobGardner wrote:

How about a 'personal amplifier'

http://www.seniorshops.com/minitech.html

It's a hearing aid for people too vain to buy a hearing aid.

Cheers!
Rich

 

[Rich Grise]

On Mon, 25 Oct 2004 22:49:31 +0000, BobGardner wrote:

Either a low cost purchased unit, or the schematics to build one.
I am trying to detect in the 0- 30Hz range.
============================
So how about a loop antenna, an instrumentation amp, and a 30 hz active lp
filter and a scope?

I wanna see his 0 Hz antenna!

Cheers!
Rich

 

[Jamie]

yes.,
they call it a flip flop.
A D type will work with its DATA
input connected to an out.
a RS, or JK also..
the output will be a logic 5 or
what ever depending on what family
of logic chip you use.
you most likely want to use something
like a TTL, HC or CMOS into a transistor/
a HexFet works well for this.



vicebay wrote:

Hi, I would like to ask if anyone know a circuit or an IC that has
the following characteristic.

single input -- single output

The output should only be triggered by a positive (1) input and will
not change even if the input changed it state to 0. But when the
input changed in state to 1 again, the output should change in state.

I would like to implement this on my design in a sequential light.

TIA

-vicebay

 

[Rich Grise]

On Tue, 26 Oct 2004 19:21:07 -0700, Ed Masters wrote:

Is any technical reason why I should not place light
objects on top of a microwave?

No. It's a sheet metal box, for heaven's sakes. ;-)

Don't block the vents, or the thermal cutout will make it
stop cooking till it cools, but as far as microwaves, it's
an inert box. Grounded, BTW, so you can even put static-
sensitive utensils on top. ;-)

Bon Appetit!
Rich

 

[Rich Grise]

On Tue, 26 Oct 2004 22:08:52 -0700, Jamie wrote:

yes.,
they call it a flip flop.
A D type will work with its DATA
input connected to an out.
a RS, or JK also..
the output will be a logic 5 or
what ever depending on what family
of logic chip you use.
you most likely want to use something
like a TTL, HC or CMOS into a transistor/
a HexFet works well for this.

The assignment is to implement one with gates. If it
were me, I'd use a master-slave arrangement, because I've
never been able to figure out how to toggle one. But I
can toggle a 2-transistor, emitter-coupled flip-flop.
Go figure. ;-)

Cheers!
Rich

 

[Terry Pinnell]

vsebay@edsamail.com (vicebay) wrote:

Hi, I would like to ask if anyone know a circuit or an IC that has
the following characteristic.

single input -- single output

The output should only be triggered by a positive (1) input and will
not change even if the input changed it state to 0. But when the
input changed in state to 1 again, the output should change in state.

I would like to implement this on my design in a sequential light.

TIA

-vicebay

Here's a circuit using Jamie's suggested approach:
http://www.terrypin.dial.pipex.com/Images/4013FF.gif

--
Terry Pinnell
Hobbyist, West Sussex, UK