audio recording on IC -help wanted

[JW]

On Fri, 05 Sep 2003 11:34:48 -0400 William P.N. Smith
<wpns@compusmiths.com> wrote in Message id:
<75bhlvolvv6tsik2tl5aiqtpof76aval4d@4ax.com>:

Many of the parts I'm looking at lately have been {only,more easily}
available in SMD, is there a breadboarding {material, process,
technique} that I'm missing for mocking up circuits using them? I'm
from the old school of thru-hole breadboarding, but there mst e
something more modern without makgin PC boards...

http://www.jameco.com/cgi-bin/ncommerce3/ExecMacro/jameco/home.d2w/report?cgrfnbr=874&ctgys=505;560;874;

 

[William P.N. Smith]

JW <nospam@dev.nul> wrote:

wpns@compusmiths.com> wrote in Message id:
Many of the parts I'm looking at lately have been {only,more easily}
available in SMD, is there a breadboarding {material, process,
technique} that I'm missing for mocking up circuits using them? I'm
from the old school of thru-hole breadboarding, but there mst e
something more modern without makgin PC boards...

http://www.jameco.com/cgi-bin/ncommerce3/ExecMacro/jameco/home.d2w/report?cgrfnbr=874&ctgys=505;560;874;

Umm, those are nice, but they all seem to have double-sided pads with
holes on 0.1" centers. How does that help with Surface Mount Devices?

--
William Smith wpns@compusmiths.com N1JBJ@amsat.org
ComputerSmiths Consulting, Inc. www.compusmiths.com

 

[Walter Harley]

"Walter Harley" <walterh@cafewalter.com> wrote in message
news:bjajok$tfn$0@216.39.172.65...

"JW" <nospam@dev.nul> wrote in message
news:mdfhlvgc7e0s6i4igojfigcqpsvf64d2ms@4ax.com...


http://www.jameco.com/cgi-bin/ncommerce3/ExecMacro/jameco/home.d2w/report?cgrfnbr=874&ctgys=505;560;874;

That link doesn't seem to be working, at least not for me.

Cancel that - IE wasn't picking up the final ";". When I add that the link
works. You're linking to a collection of items Jameco sells, mostly
prototyping boards.

But, the boards you linked to all seem to be 0.1" grid through-hole boards -
that is, perfect for prototyping through-hole components, but not useful for
SMD, which is what the OP was asking about.

JW, am I missing something in your post? Thanks!

 

[William P.N. Smith]

"Walter Harley" <walterh@cafewalter.com> wrote:

"JW" <nospam@dev.nul> wrote in message

http://www.jameco.com/cgi-bin/ncommerce3/ExecMacro/jameco/home.d2w/report?cgrfnbr=874&ctgys=505;560;874;

That link doesn't seem to be working, at least not for me.

It stalls in Netscape, seems to work in IE. I found some SMD
prototyping stuff in Jameco, but it's either conversions to 0.1"
thru-hole or boards-jammed-with-stuff for $45.

What does everyone else use for SMD prototyping?

--
William Smith wpns@compusmiths.com N1JBJ@amsat.org
ComputerSmiths Consulting, Inc. www.compusmiths.com

 

[Lewin A.R.W. Edwards]

Many of the parts I'm looking at lately have been {only,more easily}
available in SMD, is there a breadboarding {material, process,
technique} that I'm missing for mocking up circuits using them? I'm

It depends how fine-pitch the part is, and how many pins. For packages
with a reasonably small number of pins, "dead-bug" style works well -
use wire-wrap wire to solder the device pins to the top (socket end)
of a wire-wrap DIP socket. This gets hard for anything with VERY fine
pins, but it's easy for gull-wing SOIC devices and SOP. TSSOP is tough


You can also buy prototyping boards with various standard SMD land
patterns etched on them, and the lines run out to pads on the edge.
You solder down the device, and use the pads to attach other hardware
(or 100 mil headers).

 

[Paul Smith]

There are some SMD breadboards called "SurfBoards" made by Capital Advanced
Technologies. DigiKey and Newark carry them.

Good luck!

In article <75bhlvolvv6tsik2tl5aiqtpof76aval4d@4ax.com>,
William P.N. Smith wrote:

Many of the parts I'm looking at lately have been {only,more easily}
available in SMD, is there a breadboarding {material, process,
technique} that I'm missing for mocking up circuits using them? I'm
from the old school of thru-hole breadboarding, but there mst e
something more modern without makgin PC boards...

 

[Robert Monsen]

"Lewin A.R.W. Edwards" <larwe@larwe.com> wrote in message
news:608b6569.0309051252.5705681f@posting.google.com...

Many of the parts I'm looking at lately have been {only,more easily}
available in SMD, is there a breadboarding {material, process,
technique} that I'm missing for mocking up circuits using them? I'm

It depends how fine-pitch the part is, and how many pins. For packages
with a reasonably small number of pins, "dead-bug" style works well -
use wire-wrap wire to solder the device pins to the top (socket end)
of a wire-wrap DIP socket. This gets hard for anything with VERY fine
pins, but it's easy for gull-wing SOIC devices and SOP. TSSOP is tough


You can also buy prototyping boards with various standard SMD land
patterns etched on them, and the lines run out to pads on the edge.
You solder down the device, and use the pads to attach other hardware
(or 100 mil headers).

I have no experience with these, but I happened across them:

http://protoboards.theshoppe.com/

 

[GPE]

For prototyping CPLD's or FPGA's -- here are some pretty nice parts.
Preassembled PQFP's on boards that resemble PGA's - makes for easy
prototyping use.

See http://www.renaelectronics.com/

-- Ed



"William P.N. Smith" <wpns@compusmiths.com> wrote in message
news:75bhlvolvv6tsik2tl5aiqtpof76aval4d@4ax.com...

Many of the parts I'm looking at lately have been {only,more easily}
available in SMD, is there a breadboarding {material, process,
technique} that I'm missing for mocking up circuits using them? I'm
from the old school of thru-hole breadboarding, but there mst e
something more modern without makgin PC boards...

Thanks!

--
William Smith wpns@compusmiths.com N1JBJ@amsat.org
ComputerSmiths Consulting, Inc. www.compusmiths.com

 

[Johnboy]

Go to the Motorola website and request a free sample.
They will give you one if the price of the item is not
unusually high, and they actually have stock.
I have not researched this part number or know what it is.

"Hanse Schmid" <fsisys@gmx.net> wrote in message
news:40e698d2.0309060253.5c4c6e01@posting.google.com...

I've a Motorola M9860 Power Amplifier module ,I like to know if
someone
could give me some specifications or at least input/output power.
As you can see, these are 14 years old, and I can't find any
info. Could any one let know the IC's alternative in replace M9860
as soon.
Regards
Saman Kam

fsisys@gmx.net
Fax +49-89244331265

 

[Cees Keyer]

Scott Ritter wrote:

G'day

I have an unknown transisitor that I need to test and possibly replace.

The problem is - I can't find any listing of such a component. Does anyone
know where I can get some info on the following transistor and whether there
is an equivelant product number around ?

K 6J
C945
P

I'm pretty sure its an NPN but can't determine anything else. Looked on
Google but unfortunately I'm not resourceful enough using the web to find my
way around as yet.

I would really appreciate some information on this transistor or some useful
links where I can find out for myself

Cheers

Scott Ritter


Hmmm

it's probaly a 2sc945 which is a npn universal tor. 0.1 A ic 0.25 W ft =
250 Mhz.

replacement bc174 bc182 bc190 bc546

good lluck
Cees.


--
# Javascript is a powerful language, except it mutates faster than a
# fruit fly in a X-ray machine (Andrew TanenBaum)
# Cees Keyer, HVA dept I&E, Weesperzijde 190, 1097DZ Amsterdam, Holland
# pe1jmj@-NO_SPAM-amsat.org Voice: (+31)20-5951639, Fax: (+31)20-5951620

 

[Chaos Master]

Scott Ritter screamed:

G'day

....

K 6J
C945
P

2SC945 japanese NPN transistor.
Replacements: BC174 BC182 BC190 BC546

--
E-mail address is fake. Please reply to the group!

 

[Watson A.Name - "Watt Sun]

In article <3f59f363$0$49108$e4fe514c@news.xs4all.nl>, pe1jmj-no-spam-
@amsat.org mentioned...

Scott Ritter wrote:
G'day

I have an unknown transisitor that I need to test and possibly replace.

The problem is - I can't find any listing of such a component. Does anyone
know where I can get some info on the following transistor and whether there
is an equivelant product number around ?

K 6J
C945
P

I'm pretty sure its an NPN but can't determine anything else. Looked on
Google but unfortunately I'm not resourceful enough using the web to find my
way around as yet.

I would really appreciate some information on this transistor or some useful
links where I can find out for myself

Cheers

Scott Ritter

Hmmm
it's probaly a 2sc945 which is a npn universal tor. 0.1 A ic 0.25 W ft =
250 Mhz.

replacement bc174 bc182 bc190 bc546

WARNING! The normal pinout for plastic Japanese transistors such as
the 2SC whatevers is E C B, not the normal E B C for 2N plastics
or C B E for Euros such as the BCs and BDs.

You can fake it with a piece of shrink tubing over the C lead so that
it can cross the B lead without shorting. Another place to look for
substitutes is the www.NTEinc.com semi crossref.

good lluck
Cees.

--
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[Dave Platt]

hey has anybody ever heard of a device called a current-limiting diode
that supposedly you just put it in series and it somehow attenuates the
amount of current going thru it?
somebody told me about this and i've never found anything about it
anywhere.

There are such things as "current-source diodes" which behave somewhat
like this. An equivalent can be made by taking an ordinary JFET, and
shorting the gate and source together.

To a crude first approximation, these devices behave somewhat like a
not-terribly-linear resistor at low voltages. Once the voltage across
the device climbs up high enough, the amount of current flowing
through the device reaches a limiting value, and further increases in
voltage don't increase the current flow by very much at all... the
device's dynamic impedance becomes fairly high.

Eventually, when the voltage across the device reaches a substantially
higher limit, the device breaks down and goes FOOM.

They're a useful way to draw a reasonably-fixed amount of current from
a varying DC voltage source - handy for providing bias and load
currents, etc.

--
Dave Platt <dplatt@radagast.org> AE6EO
Hosting the 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!

 

*** post for FREE via your newsreader at post.newsfeed.com ***


BVL wrote:

Hi all,

I'm looking for the BFT66 and BFT66N pinout (High frequency bipolar NPN).

Many thanks
Bertrand

The BFT66 (low-noise microwave transistor, Siemens) comes in a TO-72
hermetically sealed metal package. Bottom view clockwise from "nose":
Base - Emitter - Collector - Case.

A datasheet is available under <http://www.freetradezone.com>.

I have no information on BFT66N. It doesn't appear in my 1981 Siemens
catalog.

BTW, does anybody know what a BFT66S is, and how it differs?

Martin.


-----= Posted via Newsfeed.Com, Uncensored Usenet News =-----
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[Louie]

does this device disipate energy like a resistor does?

There are such things as "current-source diodes" which behave somewhat
like this. An equivalent can be made by taking an ordinary JFET, and
shorting the gate and source together.

To a crude first approximation, these devices behave somewhat like a
not-terribly-linear resistor at low voltages. Once the voltage across
the device climbs up high enough, the amount of current flowing
through the device reaches a limiting value, and further increases in
voltage don't increase the current flow by very much at all... the
device's dynamic impedance becomes fairly high.

Eventually, when the voltage across the device reaches a substantially
higher limit, the device breaks down and goes FOOM.

They're a useful way to draw a reasonably-fixed amount of current from
a varying DC voltage source - handy for providing bias and load
currents, etc.

 

[Louie]

OK, that sounds like what i was told. in fact, i looked up the term and
ended up at The Unusual Diode FAQ

http://margo.student.utwente.nl/el/componen/diodefaq.html

unfortunately, it appears that such diodes have a maximum rating of
about 10mA. that explains why they are not commonly used. but could i
achieve a higher current capacity (like maybe 500mA) by putting the
output current to the base of a transistor?
i wanna make a more efficient batery charger without using a big series
resistor that will attenuate at say, 300 mA.

thanx Dave,
louie

Dave Platt wrote:

There are such things as "current-source diodes" which behave somewhat
like this. An equivalent can be made by taking an ordinary JFET, and
shorting the gate and source together.

To a crude first approximation, these devices behave somewhat like a
not-terribly-linear resistor at low voltages. Once the voltage across
the device climbs up high enough, the amount of current flowing
through the device reaches a limiting value, and further increases in
voltage don't increase the current flow by very much at all... the
device's dynamic impedance becomes fairly high.

Eventually, when the voltage across the device reaches a substantially
higher limit, the device breaks down and goes FOOM.

They're a useful way to draw a reasonably-fixed amount of current from
a varying DC voltage source - handy for providing bias and load
currents, etc.

 

[Dave Platt]

In article <%u47b.8011$mp.3387@rwcrnsc51.ops.asp.att.net>,
Louie <beavisnbutthead@softhome.net> wrote:

OK, that sounds like what i was told. in fact, i looked up the term and
ended up at The Unusual Diode FAQ

http://margo.student.utwente.nl/el/componen/diodefaq.html

unfortunately, it appears that such diodes have a maximum rating of
about 10mA. that explains why they are not commonly used.

You could probably dig through a batch of JFETs, and hand-select one
which has an Idss of 50 mA or more. I don't think you'll find one
much above that level.

but could i
achieve a higher current capacity (like maybe 500mA) by putting the
output current to the base of a transistor?
i wanna make a more efficient batery charger without using a big series
resistor that will attenuate at say, 300 mA.

Yes, you could boost the current output in this way, but I'd advise
against it for two reasons:

- The actual amount of current you'd get would be extremely dependent
on the transistor's gain (beta). This value varies significantly
from one transistor to the next, and varies significantly with
temperature. You won't find it easy to get a well-controlled
current flow.

- Anything you make of this sort... whether with a single current-
source diode, or a current-source diode feeding into a transistor...
will be *exactly* as efficient as a big series resistor would be!

Both a resistor, and a high-Z current source of this sort, will
dissipate power in the amount of (voltage across them) * (current
through them) - P=EI. There will be _no_ advantage, in energy
efficiency, in switching from a fixed resistor to a high-dynamic-
impedance current source. It'll cost you money, to no benefit at all.

To charge the battery without wasting a lot of the charge power in the
form of heat (in the pass element) you'll have to use a different type
of regulator... one whose internal current switch is either "full on"
or "full off".

Sometimes, batteries can be charged using a simple pulse width
modulation scheme... the peak current during each pulse is quite high,
but the average current is lower.

Alternatively, you can follow the PWM switching element with a flyback
diode and an inductor, to create a "buck" regulator. These allow the
switching transistor to be used in the full-on/full-off mode
(high-current pulses), but the inductor smooths out the current flow
so that the battery "sees" a nice, even current flow.

Any switching regulator of this type will require a significant amount
of control logic, to set the timing and width of the charging pulses.

--
Dave Platt <dplatt@radagast.org> AE6EO
Hosting the 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!

 

[Robert Monsen]

"Dave Platt" <dplatt@radagast.org> wrote in message
news:vlpmognorut11b@corp.supernews.com...

In article <%u47b.8011$mp.3387@rwcrnsc51.ops.asp.att.net>,
Louie <beavisnbutthead@softhome.net> wrote:

OK, that sounds like what i was told. in fact, i looked up the term and
ended up at The Unusual Diode FAQ

http://margo.student.utwente.nl/el/componen/diodefaq.html

unfortunately, it appears that such diodes have a maximum rating of
about 10mA. that explains why they are not commonly used.

You could probably dig through a batch of JFETs, and hand-select one
which has an Idss of 50 mA or more. I don't think you'll find one
much above that level.

but could i
achieve a higher current capacity (like maybe 500mA) by putting the
output current to the base of a transistor?
i wanna make a more efficient batery charger without using a big series
resistor that will attenuate at say, 300 mA.

Yes, you could boost the current output in this way, but I'd advise
against it for two reasons:

- The actual amount of current you'd get would be extremely dependent
on the transistor's gain (beta). This value varies significantly
from one transistor to the next, and varies significantly with
temperature. You won't find it easy to get a well-controlled
current flow.

- Anything you make of this sort... whether with a single current-
source diode, or a current-source diode feeding into a transistor...
will be *exactly* as efficient as a big series resistor would be!

What if you use a power transistor (say, a mosfet) and build a current
source using an opamp and a small ohm sense resistor? Seems like the voltage
drop in such a device would be far less than in a big current limiting
resistor. The voltage drop would be mostly across the battery rather than
across the battery and the resistor. However, I haven't thought this
through, so there may be a catch I'm not considering.

Both a resistor, and a high-Z current source of this sort, will
dissipate power in the amount of (voltage across them) * (current
through them) - P=EI. There will be _no_ advantage, in energy
efficiency, in switching from a fixed resistor to a high-dynamic-
impedance current source. It'll cost you money, to no benefit at all.

To charge the battery without wasting a lot of the charge power in the
form of heat (in the pass element) you'll have to use a different type
of regulator... one whose internal current switch is either "full on"
or "full off".

Sometimes, batteries can be charged using a simple pulse width
modulation scheme... the peak current during each pulse is quite high,
but the average current is lower.

Alternatively, you can follow the PWM switching element with a flyback
diode and an inductor, to create a "buck" regulator. These allow the
switching transistor to be used in the full-on/full-off mode
(high-current pulses), but the inductor smooths out the current flow
so that the battery "sees" a nice, even current flow.

Any switching regulator of this type will require a significant amount
of control logic, to set the timing and width of the charging pulses.

--
Dave Platt <dplatt@radagast.org> AE6EO
Hosting the 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!

 

[Dave Platt]

In article <8L77b.393577$YN5.258674@sccrnsc01>,
Robert Monsen <postmaster@BulkingPro.com> wrote:

What if you use a power transistor (say, a mosfet) and build a current
source using an opamp and a small ohm sense resistor? Seems like the voltage
drop in such a device would be far less than in a big current limiting
resistor. The voltage drop would be mostly across the battery rather than
across the battery and the resistor. However, I haven't thought this
through, so there may be a catch I'm not considering.

I suggest that you think it through more thoroughly. Once you work
out where the voltages are, and where the currents are flowing, you'll
observe that exactly the same situation exists.

In this case, the majority of the voltage drop would be across the
MOSFET, and this is where the energy would be dissipated as heat.


--
Dave Platt <dplatt@radagast.org> AE6EO
Hosting the 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!

 

[Louie]

yeah i see what you mean. the only practicle way to do it is with the
usual switching/feedback setup which is not worth it.
oh well its just a thought.

thanx Dave
louie

Dave Platt wrote:

In article <%u47b.8011$mp.3387@rwcrnsc51.ops.asp.att.net>,
Louie <beavisnbutthead@softhome.net> wrote:

OK, that sounds like what i was told. in fact, i looked up the term and
ended up at The Unusual Diode FAQ

http://margo.student.utwente.nl/el/componen/diodefaq.html

unfortunately, it appears that such diodes have a maximum rating of
about 10mA. that explains why they are not commonly used.

You could probably dig through a batch of JFETs, and hand-select one
which has an Idss of 50 mA or more. I don't think you'll find one
much above that level.

but could i
achieve a higher current capacity (like maybe 500mA) by putting the
output current to the base of a transistor?
i wanna make a more efficient batery charger without using a big series
resistor that will attenuate at say, 300 mA.

Yes, you could boost the current output in this way, but I'd advise
against it for two reasons:

- The actual amount of current you'd get would be extremely dependent
on the transistor's gain (beta). This value varies significantly
from one transistor to the next, and varies significantly with
temperature. You won't find it easy to get a well-controlled
current flow.

- Anything you make of this sort... whether with a single current-
source diode, or a current-source diode feeding into a transistor...
will be *exactly* as efficient as a big series resistor would be!

Both a resistor, and a high-Z current source of this sort, will
dissipate power in the amount of (voltage across them) * (current
through them) - P=EI. There will be _no_ advantage, in energy
efficiency, in switching from a fixed resistor to a high-dynamic-
impedance current source. It'll cost you money, to no benefit at all.

To charge the battery without wasting a lot of the charge power in the
form of heat (in the pass element) you'll have to use a different type
of regulator... one whose internal current switch is either "full on"
or "full off".

Sometimes, batteries can be charged using a simple pulse width
modulation scheme... the peak current during each pulse is quite high,
but the average current is lower.

Alternatively, you can follow the PWM switching element with a flyback
diode and an inductor, to create a "buck" regulator. These allow the
switching transistor to be used in the full-on/full-off mode
(high-current pulses), but the inductor smooths out the current flow
so that the battery "sees" a nice, even current flow.

Any switching regulator of this type will require a significant amount
of control logic, to set the timing and width of the charging pulses.