Chip with simple program for Toy

+---+---------------+------+------+---+---+-------+
| | | | | | | |
| [10k] [1M] [100K] [10K] | |K | O------>C
| | | | | |[1N4148] [COIL]- -|
| | +-|+\ | | | | | O--> |
| | | | >-+------|-|+\ | | |
[BAT] +-[0.1ľF]-+-----|-|-/ | | | >--+-------+ +----------->NO
| | | | | +-|-/
| | | | |+ | |
| [MIC] [100k] [10K] [10ľF] [1M] |
| | | | | | |
+---+---------+-----+------+------+---+




how is the comparator conected?

* *
| |
|-|+\
| | >
+-|-/
| |
* *


has the comparator four inputs? Or is that on the right a vertical
wire?





----+
|
| O-------> C
[COIL]- -|
| O--> |
| |
----+ +------------> NO

And with how many inputs is the relay connected? Are the + + also
connected, or the [COIL]- - ?


And please, answear me my last question to the LM393, too!
 
"Lord Garth" <LGarth@Tantalus.net> wrote in message
news:gqNbe.1604$gd5.510@newssvr12.news.prodigy.com...
Assuming you've gone to classic menus within WinXP, dumping the
Fisher-Price look [......]
Click to expand...
I always thought it looked like Candy Land.

I just got an idea for an original work of art. Take a dead monitor, chew
up various colors of bubble gum, and stick bits of it on the screen in a
mosaic that looks exactly like XP.


--

Reply in group, but if emailing add
2 more zeros and remove the obvious.
 
If I construct it with a timer, where in the circuit should I built it
in and which type of should I take?
 
interuser wrote:
Hi ,
I have a 2 floor home and I would like and make an intercom using the
existing telephone circuit. Since every room has a telephone the
problem is making the telephones ringing. How would I do that?
Click to expand...
The presence of only a single circuit of wiring in the house is not
necessarily a problem, as long as only one talk circuit is used at a
time, and security of comms is not needed. Simply wire all phones to
the one circuit, and use a different ring pattern for each user or each
phone point. I used this method to run a small exchange, plus an
answerphone for voice announcement, so the right end user was selected
regardless of which phone they were near.


NT
 
"Watson A.Name - "Watt Sun, the Dark Remover"" <NOSPAM@dslextreme.com> wrote
in message news:117b2rslf0s8ae9@corp.supernews.com...
"Jamie" <jamie_5_not_valid_after_5_Please@charter.net> wrote in message
news:mcfde.30535$Jg7.29741@fe03.lga...
jim dorey wrote:

On Thu, 28 Apr 2005 04:52:02 -0300, Watson A.Name - "Watt Sun, the
Dark
Remover" <NOSPAM@dslextreme.com> wrote:

What I can't understand is why Tezas, with half the population of
California, has roughly the same number of prisoners sentenced to
death,
but Cailf has only one execution, Texas has 40. Must have
something to
do with lawyers.
:-/


maybe they're just bred to be less trusting of people who plead
innocence, the 'let god sort em out' mentality.

god is the one that forgives and gives them another chance, the
lawyers
in Texas just make sure the meeting takes place.

But _why_ the descrepancy between TX and Calif?
Click to expand...
We mean what we say in Texas! Why bother to use sterile needles
though?
 
Hi Don,
One solution is to charge a cap to 48V with a resistor that will drop
36 volts when in series with the solenoid. Assuming the duty cycle will
allow the cap to recharge.
+48v
|
resistor
|
CAP-------solenoid
| |
| driver transistor
| |
| |
common---------

Dave
 
OOPS, my drawing with the keyboard leaves much to be desired..

+48v
|
resistor
|
----------solenoid
| |
CAP driver transistor
| |
| |
common---------

Dave
 
John Fields wrote:

I like John Woodgate's trick, but you'll be dissipating three times
more power in the resistors than in the solenoids. Can you stand
that?
Click to expand...


I like it too. Thanks, John W. & Dave. I also like the idea of the
solenoid driver chip, but it seems that they run three or four bucks
apiece.

The solenoids are 2 watts. So does this mean that I'll need at least a
6-watt resistor (3 * 2W) for each solenoid circuit? No more than six
of the solenoids ever fire simultaneously. So I guess the max. total
heat loss would be

(6 * 2W) + (6 * 6W) = 48 watts

Am I all wet on this?

Don
Kansas City
 
John Fields wrote:
On 5 May 2005 07:37:19 -0700, "eromlignod" <eromlignod@aol.com
wrote:

John Fields wrote:

I like John Woodgate's trick, but you'll be dissipating three
times
more power in the resistors than in the solenoids. Can you stand
that?


I like it too. Thanks, John W. & Dave. I also like the idea of the
solenoid driver chip, but it seems that they run three or four bucks
apiece.

The solenoids are 2 watts. So does this mean that I'll need at
least a
6-watt resistor (3 * 2W) for each solenoid circuit? No more than
six
of the solenoids ever fire simultaneously. So I guess the max.
total
heat loss would be

(6 * 2W) + (6 * 6W) = 48 watts

Am I all wet on this?

---
Nope, you're exactly right.
Click to expand...

OK, great. Now, I don't have the solenoids in hand yet, but I'm
thinking the coil resistance should be Rc = V^2 / P, or

Rc = (12V)^2 / 2W = 72 ohms

So the resistor should be about 3 x 72 = 216 ohms. For an RC of 50 ms,
this would make my capacitor about

C = t / R = .050s / 216 = 231 uF

If I have room for such large components, this should do nicely.
Thanks everyone!

Don
Kansas City
 
Hi John,
I agree that the cap in parallel with the resistor is a better if the
48V supply can handle the instantaneous current of the turn on of
multiple solenoids. It would depend on the criteria for the solenoid
actuation and the specs. on the 48V supply.

Dave
 
John Fields wrote:
If you don't, and you want to cut the wasted power to essentially
zero, you might want to try something like this:

news:ccvm71pbvs0hgn1155m6a1j36f308oi1pc@4ax.com
Click to expand...

I couldn't get the link to work, John. But you have piqued my
curiosity.

Don
Kansas City
 
John Fields wrote:
On Fri, 06 May 2005 18:10:08 GMT, John - KD5YI
groups5munge@verizon.net> wrote:


Can't you just add one more diode (D2 connected to +12V)? Then R
can
be made as large as possible, limited only by desired recovery
time,
and the resistor dissipation drops way down.....


D2
+----|<----o +12V
D1 |
+------|<---|---------+
| | |
+48 V--+-+----R----+---COIL--+---Switching device-----
0V
| |
| |
`----C----'


Wouldn't that kind of depend on how good your +12 supply is at
sinking
reverse current?

Thanks,
Rich


Move D1's cathode to the supply end of the coil.

---
That will likely lead to the destruction of the switching device when
the field around the coil collapses.

--
John Fields
Professional Circuit Designer
Click to expand...
Why? Provided C charges slowly, which it will, at release
time the coil's supply node will be at 12v minus D2's drop.
The flyback voltage seen by the driver then will be 12V-Vf(D2),
plus D1's forward drop, or 12v.

Jim Thompson's arrangement turns the coil off faster. Recycle
time isn't much different -- clamping by D2 prevents reverse-charging
of C, so that node stays near 12v during flyback for both circuits.

Regards,
James Arthur
 
Paul Horwood wrote:
HI,

I have a question regarding a radio reciever. Now I know I can do
this
another way but here is the idea.

The recieved radio signal is embedded deep within noise. Is it
possible to
take the audio signal and use a choke or something to kill the noise
so that
just the signal can then be heard and amplified?
Click to expand...
no, because the noise is at the same frequency as the audio. Same is
true at rf.

You can cut the higher audio frequencies, since that will remove a lot
of noise while still leaving the audio intelligible.


NT
 
and use a firewall.
Hardware appliances provide more robust protection
than software-only firewalls.
Lloyd E. Sponenburgh
Click to expand...
Do your hardware solutions do egress filtering?
 
Please stay on topic, since i don't want to start here a textual war about
the indoor use of ozone.
 
Andy writes:

Without knowing their biasing circuitry, I don't think
a complete answer can be given. Some biasing circuits
are fairly forgiving, others seem like balancing a pencil
on it's end...

But, in my opinion, Vbe and hfe are primary parameters.

I would be interested in learning a better answer myself, tho.

You might consider sci.electronics.design also, if you
haven't already.

There are some competent IC designers there, who
deal with problems like this when they design their
miracle circuits.....

Andy
 
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