Chip with simple program for Toy

[Tzortzakakis Dimitrios]

? "VWWall" <vwall@large.invalid> ?????? ??? ??????
news:trmdnXoncLvbJ8vVnZ2dnUVZ_gOdnZ2d@earthlink.com...

google@woodall.me.uk wrote:
On Jun 16, 6:35 pm, "goo...@woodall.me.uk" <goo...@woodall.me.uk
wrote:
On Jun 16, 12:58 am, VWWall <vw...@large.invalid> wrote:> sparky wrote:
? "VWWall" <vw...@large.invalid> ?????? ???
??????news:XoWdncTJufdb2MnVnZ2dnUVZ_u6dnZ2d@earthlink.com...
Don't let monster Cables know you're using #16 for speakers!
Even if he was using #10 it would be cheaper than monster cable;-)
But it wouldn't be OFHC Copper!
And sound at least as good !
Some interesting observations:
From:http://www.roger-russell.com/wire/wire.htm#oxygenfree
Ah. But they weren't using one of these power leads ;-)

http://www.psaudio.com/products/xstream_ultimate_overview.asp

Or perhaps one of these:
http://www.needledoctor.com/Tara-Labs-ISM-The-ONE-AC-Power-Cable

I can't believe there's more than one company doing things like this
(or is it all an elaborate April fool?)

The audiophile community seems to have a adequate supply of fools,
regardless of the month! There's a more than adequate supply of those
ready to fool them, if only most of the time.

Where else is a complex signal transmitted and replicated many times
through non-linear systems, accessed by a non-linear human ear, and
evaluated by the most complex element of all, the human brain?

No wonder there's room for fools! "Send in the clowns."

$140 a foot? For $2bn you have a custom nuclear power plant, (1.3 GW,

impulse current 100 kA at 400 kV)with enough wattage to satisfy even the
more power hungry stereo maniac! Complete with OFC wiring right to your
receptacle. I thought that somebody would think of special plug cables!
(PS see in this videoclip in you tube an interesting song by OMD with some
disconnect switches closing
http://youtube.com/watch?v=Sq2vl99iIEc&feature=related )

 

[Francis Elers]

--

Francis Elers
36-54 35th Street, Apt # 22
Astoria, NY 11106-1317
USA

cell (347) 528-6677
e-mail franciselers@earthlink.net
web www.signaturesound.info
AIM elersfc
"Francis Elers" <franciselers@earthlink.net> wrote in message news:...

Thanks for your help. I admit I didn't really concern myself with that
aspect at this stage, When I tested it with LTSpice it seemed to do
exactly what I wanted so I just went ahead, intending to use a solve
impedance problems later. I don't know what load LTSpice assumes for it
when I run the simulation. In the event it was placed in the pre-amp
out/power-amp in path of a standard Hi-Fi amplifier.

As you will have realised by now I am a complete novice. Please accept my
apologies if this stuff is annoyingly basic. Thanks again

Francis Elers.

 

[Francis Elers]

--

Francis Elers
36-54 35th Street, Apt # 22
Astoria, NY 11106-1317
USA

cell (347) 528-6677
e-mail franciselers@earthlink.net
web www.signaturesound.info
AIM elersfc
"Francis Elers" <franciselers@earthlink.net> wrote in message news:...

Thanks for your help. I admit I didn't really concern myself with that
aspect at this stage, When I tested it with LTSpice it seemed to do
exactly what I wanted so I just went ahead, intending to use a solve
impedance problems later. I don't know what load LTSpice assumes for it
when I run the simulation. In the event it was placed in the pre-amp
out/power-amp in path of a standard Hi-Fi amplifier.

As you will have realised by now I am a complete novice. Please accept my
apologies if this stuff is annoyingly basic. Thanks again

Francis Elers.

 

[christofire]

"lerameur" <lerameur@yahoo.com> wrote in message
news:d3a21af4-063e-4756-a08b-a2062bd57dad@w7g2000hsa.googlegroups.com...

On Jun 17, 3:34 pm, John Fields <jfie...@austininstruments.com> wrote:
On Tue, 17 Jun 2008 12:05:29 -0700, Tim Wescott <t...@seemywebsite.com
wrote:



lerameur wrote:
hello,

I want to make a coil winding machine, I would like to implement a
sensor so I can count the velocity of the wire I am coiling so I can
accurately count the length of the wire,
is there any type of sensors out there that can do that.
thanks
k
Search on "optical interrupter".

To count turns you attach a wheel to your coil spindle that has a slot
(or slots) in its edge. Then you shine a light through the path of the
slots, and receive the light with a photo transistor. Then you count
the number of times the light flashes, divide by the number of slots,
and you have a turns count.

---
But that only gives him turns, not length of wire, and if he's winding
more than one layer...

To get length he could run the wire over a slotted idler.

JF

the problem is that the sensor sees the wire, but this is thin wire
and I dont think the sensor will actually the wire moving.
I think by adding a control wheel with rubber around it while adding
a sensor to that wheel could work good enough.

k

You could measure the added weight of the bobbin after winding and, with
reference to weight-per-metre data from the wire manufacturer, calculate the
length. Seems the simplest way to me.

Chris

 

[Tom Biasi]

<tapaswini123sahu@gmail.com> wrote in message
news:a27fa65a-38b0-4a13-bf16-41f147028b8b@v1g2000pra.googlegroups.com...

please sene me solution manual of principles of communication engg by
staub and schiling nad solution manual of digital & analoge
electronics by millman halkies

Wht don't you post your exam here and we will do it for you?

 

[ian field]

"Dave.H" <the1930s@googlemail.com> wrote in message
news:5a943c3d-af76-42d7-8745-2dfc65a2bc3c@a9g2000prl.googlegroups.com...

On Jun 19, 12:23 am, "Dave.H" <the19...@googlemail.com> wrote:
I have found a valve preamp kit in an online store, to go between an
amplifier based on an LM380 chip, and a crystal or regen radio, but it
uses a microphone where I want an audio input. If anyone can tell me
how to connect an audio in one this or give me a schematic for a low
voltage preamp using a single 12AU7 tube, I'd be grateful

Thanks
Dave

Oops, forgot the link to the preamp kit,
http://secure.oatleyelectronics.com//product_info.php?products_id=722

They do have (had) another similar preamp with an audio input, but
none are in stock now (discontinued)

Can you upload the regen schematic to a picture host and post the link?

 

[ian field]

"Dave.H" <the1930s@googlemail.com> wrote in message
news:5a943c3d-af76-42d7-8745-2dfc65a2bc3c@a9g2000prl.googlegroups.com...

On Jun 19, 12:23 am, "Dave.H" <the19...@googlemail.com> wrote:
I have found a valve preamp kit in an online store, to go between an
amplifier based on an LM380 chip, and a crystal or regen radio, but it
uses a microphone where I want an audio input. If anyone can tell me
how to connect an audio in one this or give me a schematic for a low
voltage preamp using a single 12AU7 tube, I'd be grateful

Thanks
Dave

Oops, forgot the link to the preamp kit,
http://secure.oatleyelectronics.com//product_info.php?products_id=722

They do have (had) another similar preamp with an audio input, but
none are in stock now (discontinued)

Can you upload the regen schematic to a picture host and post the link?

 

[christofire]

"John Fields" <jfields@austininstruments.com> wrote in message
news:er9g549fjpbksh8m80ju2p81bpkevkasuj@4ax.com...

On Tue, 17 Jun 2008 21:45:51 +0100, "christofire"
christofire@btinternet.com> wrote:

-- snip --

---
It would be nice to know how much wire was going on the bobbin (or
whatever) as it was being wound, otherwise how would you know when you
were finished?

JF

By achievement of the required number of turns?

Perhaps I've misunderstood - maybe this is about coil winding of resistors
not inductors or transformers!

Chris

 

[christofire]

"John Fields" <jfields@austininstruments.com> wrote in message
news:er9g549fjpbksh8m80ju2p81bpkevkasuj@4ax.com...

On Tue, 17 Jun 2008 21:45:51 +0100, "christofire"
christofire@btinternet.com> wrote:

-- snip --

---
It would be nice to know how much wire was going on the bobbin (or
whatever) as it was being wound, otherwise how would you know when you
were finished?

JF

By achievement of the required number of turns?

Perhaps I've misunderstood - maybe this is about coil winding of resistors
not inductors or transformers!

Chris

 

[ian field]

"Dave.H" <the1930s@googlemail.com> wrote in message
news:404015e4-00e7-40f0-badc-1a5beb73ba39@h1g2000prh.googlegroups.com...

On Jun 19, 1:46 am, "ian field" <dai....@ntlworld.com> wrote:
"Dave.H" <the19...@googlemail.com> wrote in message

news:5a943c3d-af76-42d7-8745-2dfc65a2bc3c@a9g2000prl.googlegroups.com...

On Jun 19, 12:23 am, "Dave.H" <the19...@googlemail.com> wrote:
I have found a valve preamp kit in an online store, to go between an
amplifier based on an LM380 chip, and a crystal or regen radio, but it
uses a microphone where I want an audio input. If anyone can tell me
how to connect an audio in one this or give me a schematic for a low
voltage preamp using a single 12AU7 tube, I'd be grateful

Thanks
Dave

Oops, forgot the link to the preamp kit,
http://secure.oatleyelectronics.com//product_info.php?products_id=722

They do have (had) another similar preamp with an audio input, but
none are in stock now (discontinued)

Can you upload the regen schematic to a picture host and post the link?

http://www.oldradios.co.nz/hikers/, it's the 1951 Improved Hiker's one
valve

Replace the headphones with a logarithmic pot - the kit instructions should
indicate the resistance value to use, you need to make sure the pre-amp's
input capacitor's working voltage is rated to withstand the full HT on the
regen, or you could add a coupling capacitor to the pot's wiper.

 

[Phil Allison]

"DeanB"

I've only done a little soldering before, but I want to rebuild a
battery pack for my TI-59 calculator (which is basically 3 AA-sized
batteries soldered together in series).

Can I just solder directly onto the battery terminals?

** With decent soldering iron and some care - yes.

With a copper wire.

** Solid or stranded or tin plated - take your pick.

Should I use flux?

** What is found inside normal flux-cored solder is fine.

Will this overheat the battery and/or blow it up?

** No - not unless you take an inordinate amount of time to make the
joint.

Warnings against soldering direct NiCd or NiMH cells are not founded on
fact.

Manufacturers use steel tabs & spot welding as it is a much quicker method
in mass production - but makes an inferior joint ( more resistance) than one
made with short, solid copper wires and solder.



...... Phil

 

[ian field]

"Dave.H" <the1930s@googlemail.com> wrote in message
news:1b4426d2-160f-4fca-a3f1-293899c63bae@w4g2000prd.googlegroups.com...

On Jun 20, 12:42 am, "ian field" <dai....@ntlworld.com> wrote:
"Dave.H" <the19...@googlemail.com> wrote in message

news:404015e4-00e7-40f0-badc-1a5beb73ba39@h1g2000prh.googlegroups.com...



On Jun 19, 1:46 am, "ian field" <dai....@ntlworld.com> wrote:
"Dave.H" <the19...@googlemail.com> wrote in message

news:5a943c3d-af76-42d7-8745-2dfc65a2bc3c@a9g2000prl.googlegroups.com...

On Jun 19, 12:23 am, "Dave.H" <the19...@googlemail.com> wrote:
I have found a valve preamp kit in an online store, to go between
an
amplifier based on an LM380 chip, and a crystal or regen radio, but
it
uses a microphone where I want an audio input. If anyone can tell
me
how to connect an audio in one this or give me a schematic for a
low
voltage preamp using a single 12AU7 tube, I'd be grateful

Thanks
Dave

Oops, forgot the link to the preamp kit,
http://secure.oatleyelectronics.com//product_info.php?products_id=722

They do have (had) another similar preamp with an audio input, but
none are in stock now (discontinued)

Can you upload the regen schematic to a picture host and post the
link?

http://www.oldradios.co.nz/hikers/, it's the 1951 Improved Hiker's one
valve

Replace the headphones with a logarithmic pot - the kit instructions
should
indicate the resistance value to use, you need to make sure the pre-amp's
input capacitor's working voltage is rated to withstand the full HT on
the
regen, or you could add a coupling capacitor to the pot's wiper.

I just built a two transistor (BC549,BC558) preamp kit that works
well, will use that. I have a question regarding another regen I
have. The 45 volt HT is placed across the headphone terminals, how
would I connect an IC based amp to the radio, without frying the chip?

Put a resistor of the same resistance as specified for the phones in place
of the phones, then couple the plate/anode to the top of a volume pot via a
non-polar capacitor (0.1 - 0.47uF) rated to withstand the HT and take the
O/P to the IC from the wiper - the bottom of the pot is obviously taken to
ground.

You may find the IC input impedance is a little on the low side (often less
than 47k) resulting in not much volume, an easy quick fix is to add a simple
JFET source follower between the wiper and the IC amp chip - take the Vdd
from the IC supply rail.

 

[Phil Allison]

<mrdarrett@gmail.com>

In this data sheet for the TIP31A:

http://www.fairchildsemi.com/ds/TI/TIP31A.pdf

The spec is given:
VCE(sat) * Collector-Emitter Saturation Voltage IC = 3A, IB = 375mA:
1.2 V

Does this mean then that the resistance between the collector and
emitter is (1.2V) / (3A) = 0.4 ohms, when the transistor is carrying
3A through the collector to the emitter?

If so, that's a bit higher than the Rds_on for the IRF530, at 0.1 ohm.

** You have just discovered why power MOSFETS have been preferred over BJTs
for high current switching applications for the last 20 years or so.




....... Phil

 

[Phil Allison]

"John Fields pedantic ASD fucked fuckwit "

Indeed, but there are always those applications where Vbe(sat)for a
BJT at <= 0.3V will beat out a MOSFETs Rds(on).

** Vbe (sat ) ??




....... Phil

 

[Bob Eld]

<mrdarrett@gmail.com> wrote in message
news:e4ebd8ab-a9d5-4043-abff-6c6d1275e586@t12g2000prg.googlegroups.com...

I'm trying to figure out if I could drive a transformer with pulsed
DC, and have it work (not saturate, overheat, etc.)

Ideally I'd like to pulse a self-wound toroidal transformer with
12VDC, on the primary, and get 48VDC out of the secondary, center-
tapped to get +/-24V on each leg. I plan to use a 555 in astable
mode, 50% duty cycle, driving a mosfet to feed the transformer
primary, at frequencies I haven't determined yet - anywhere from 100
Hz to 100 kHz.

Wikipedia has this:

The time-derivative term in Faraday's Law shows that the flux in the
core is the integral of the applied voltage.[11] Hypothetically an
ideal transformer would work with direct-current excitation, with the
core flux increasing linearly with time.[12] In practice, the flux
would rise very rapidly to the point where magnetic saturation of the
core occurred, causing a huge increase in the magnetising current and
overheating the transformer. All practical transformers must therefore
operate under alternating (or pulsed) current conditions.

so it implies a transformer can be driven by pulses. In practice,
what happens when driving a transformer with pulsed DC? Should I
stick to low frequencies? Go for higher frequencies?

Good idea / bad idea / horribly bad idea?

Thanks,

Michael

Keep the DC out of the transformer, especially a torroid as they have little
tolerance for DC offset. Transformers or inductors that tolerate DC offsets
have air gaps or the equivalent to limit saturation.

The simple way is to drive the transformer through a capacitor, thus
blocking all DC into it's primary. The secondary will convey the pulse, but
the zero volt position will be somewhere in the middle of the pulse so that
the area above zero equals the area below zero. DC can be restored with
appropriate diodes.

For example say the original pulse train was positive going 4 Volts for 1
msec. then zero volts for 3 msec.

If the transformer ratio is 1 : 1, then the secondary would show 3 Volts
positive for 1 msec and 1 Volt negative for 3 msec. The positive area equals
the negative area. Of course, if the pulse width changes, the zero line
would shift to equalize areas. Faraday's law.

 

[Talal Itani]

Ok, maybe not tiny. I have never seen this before, so I wonder whey these
inductors are there.

BTW, 50uH isn't really "tiny".

 

[Tom Biasi]

<gavin.abbott@gmail.com> wrote in message
news:295e286e-fae1-4c00-bc68-72eadd2dbe03@y21g2000hsf.googlegroups.com...

Hey everyone. I am in the final stages of making my EMF Detector but
the schematic shows a 1mH inductor/probe for the device and it has
been YEARS since I made one and cant remember how. The device runs
off 1 9v battery so any help would be appreciated.

You have made a 1mH inductor/probe before?
Can you supply a schematic of your project?
Tom

 

[Phil Allison]

"luke@talesa.net"

Hi there, I've noticed that my GSM phone creates a noise through my
speakers sometimes (ie when the phone is communicating with the
mothership). No, I don't want to know how to stop it from happening,
I'm wondering what the limits of this interference are ? Is there some
device I can use or create to make more than a series of clicks come
through the speaker ?

** A CB radio transmitter often does a pretty good job.

27MHz or UHF will break into audio gear if the signal is strong enough.


...... Phil

 

[BobW]

"Phil Allison" <philallison@tpg.com.au> wrote in message
news:6c5ul2F3esqv3U1@mid.individual.net...

"luke@talesa.net"

Hi there, I've noticed that my GSM phone creates a noise through my
speakers sometimes (ie when the phone is communicating with the
mothership). No, I don't want to know how to stop it from happening,
I'm wondering what the limits of this interference are ? Is there some
device I can use or create to make more than a series of clicks come
through the speaker ?


** A CB radio transmitter often does a pretty good job.

27MHz or UHF will break into audio gear if the signal is strong enough.


..... Phil

Boy howdy! It can be quite a startle when some ahole with a big rf amp on
his CB radio drives by while you're listening to a nice quiet passage of
Beethoven or Nirvana.

Bob
--
== NOTE: I automatically delete all Google Group posts due to uncontrolled
SPAM ==

 

[Paul E. Schoen]

<tapaswini123sahu@gmail.com> wrote in message
news:a27fa65a-38b0-4a13-bf16-41f147028b8b@v1g2000pra.googlegroups.com...

please sene me solution manual of principles of communication engg by
staub and schiling nad solution manual of digital & analoge
electronics by millman halkies

Please contact your places of prospective employment and ask them if they
have solution manuals for every design job you will expected to engineer.
Then you can just make copies and send them directly to production, and you
can collect a fat paycheck for simply knowing how to work a copier. And I'm
sure they will give you a "solution manual" so you can be told what buttons
to push.

If you get a job somewhere, let us all know where you work so we can avoid
any products made by that company and "designed" by you.

Paul