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In article <ludkjf$1lso$1@adenine.netfront.net>,
bperryb@bowdenshobbycircuits.info says...
"Jim Thompson" <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote
in
message news:gsbk0at5rmkvlfa2hisq8cj70mu8o6tpol@4ax.com...
On Fri, 5 Sep 2014 14:37:38 -0700, "Bill Bowden"
wrote:
I found abag of 2N4123 (NPN) (30V 200mA) that were damaged in a loading
machine. The leads all have little nicks and some leads are bent and
ready
to fall off so I solder extention leads. Never counted them but they
half
fill a coffee can. Maybe 2000 or so and the price was right at $3 for
the
whole bag.
Motorola used to sell those general purpose NPN and PNP transistors by
weight... it was too expensive to count them ;-)
...Jim Thompson
I bet you don't have one of these ----: Toshiba MG240V1US41, 240 amp,
1700
volt, N channel IGBT, weighs 1 pound.
It's only a N channel on the input and that only drives the base or
bases of the actual bipolar transistor, which is the part handling all
that current and voltage.
So one must understand that the V(ce)saturation voltage isn't going to
be low as you would expect otherwise.
Jamie
"Maynard A. Philbrook Jr." <jamie_ka1lpa@charter.net> wrote in message
news:MPG.2e742ad2ddfea383989a33@news.eternal-september.org...
In article <ludkjf$1lso$1@adenine.netfront.net>,
bperryb@bowdenshobbycircuits.info says...
"Jim Thompson" <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote
in
message news:gsbk0at5rmkvlfa2hisq8cj70mu8o6tpol@4ax.com...
On Fri, 5 Sep 2014 14:37:38 -0700, "Bill Bowden"
wrote:
I found abag of 2N4123 (NPN) (30V 200mA) that were damaged in a loading
machine. The leads all have little nicks and some leads are bent and
ready
to fall off so I solder extention leads. Never counted them but they
half
fill a coffee can. Maybe 2000 or so and the price was right at $3 for
the
whole bag.
Motorola used to sell those general purpose NPN and PNP transistors by
weight... it was too expensive to count them ;-)
...Jim Thompson
I bet you don't have one of these ----: Toshiba MG240V1US41, 240 amp,
1700
volt, N channel IGBT, weighs 1 pound.
It's only a N channel on the input and that only drives the base or
bases of the actual bipolar transistor, which is the part handling all
that current and voltage.
So one must understand that the V(ce)saturation voltage isn't going to
be low as you would expect otherwise.
Jamie
Vce (sat) is 3.2 volts at 240 amps.
So what's that, about 750 watts of waste?
I bet you don't have one of these ----: Toshiba MG240V1US41, 240 amp, 1700
volt, N channel IGBT, weighs 1 pound.
It's only a N channel on the input and that only drives the base or
bases of the actual bipolar transistor, which is the part handling all
that current and voltage.
So one must understand that the V(ce)saturation voltage isn't going to
be low as you would expect otherwise.
In article <ludp7c$1ujp$1@adenine.netfront.net>,
bperryb@bowdenshobbycircuits.info says...
"Maynard A. Philbrook Jr." <jamie_ka1lpa@charter.net> wrote in message
news:MPG.2e742ad2ddfea383989a33@news.eternal-september.org...
In article <ludkjf$1lso$1@adenine.netfront.net>,
bperryb@bowdenshobbycircuits.info says...
"Jim Thompson" <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com
wrote
in
message news:gsbk0at5rmkvlfa2hisq8cj70mu8o6tpol@4ax.com...
On Fri, 5 Sep 2014 14:37:38 -0700, "Bill Bowden"
wrote:
I found abag of 2N4123 (NPN) (30V 200mA) that were damaged in a
loading
machine. The leads all have little nicks and some leads are bent and
ready
to fall off so I solder extention leads. Never counted them but they
half
fill a coffee can. Maybe 2000 or so and the price was right at $3
for
the
whole bag.
Motorola used to sell those general purpose NPN and PNP transistors
by
weight... it was too expensive to count them ;-)
...Jim Thompson
I bet you don't have one of these ----: Toshiba MG240V1US41, 240 amp,
1700
volt, N channel IGBT, weighs 1 pound.
It's only a N channel on the input and that only drives the base or
bases of the actual bipolar transistor, which is the part handling all
that current and voltage.
So one must understand that the V(ce)saturation voltage isn't going to
be low as you would expect otherwise.
Jamie
Vce (sat) is 3.2 volts at 240 amps.
So what's that, about 750 watts of waste?
Jamie
Vce (sat) is 3.2 volts at 240 amps.
So what's that, about 750 watts of waste?
Jamie
If you are switching 1700 volts at 240 amps, that's about 408000 watts. What
percentage is 750 out of 408K?
what?
Grin, Most of the time if I use a transistor it's go an opamp wrapped around it.On Fri, 05 Sep 2014 06:18:50 -0700, George Herold wrote:
On Thursday, September 4, 2014 6:06:07 PM UTC-4, Tim Wescott wrote:
On Thu, 04 Sep 2014 12:00:42 -0700, Ivan Vegvary wrote:
The 2N3904 will substitute for the 2N2222 in just about anything.
There's
also a "PN2222" that's supposedly a 2N2222 die in a TO-92 case.
Or 2N4401/ 4403 for pnp.
Somehow I fell into liking the 2N3904 / 2N3906 pair -- I don't know why,
and at this late date I can't justify it.
(Actually, when I'm prototyping with through-hole parts I have a small jar
marked NPN and another one marked PNP. 9 times out of 10 I just shake one
out of the jar, plug it in, and it works. The tenth time I actually have
to select something specific.)
These days if there's a transistor in one of my circuits, it's almost
always a dual or prebiased, it's in the smallest package that I feel up to
dealing with, and I just look for what's available on DigiKey.
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com