BC547 substitute?
Tony Gies
instead?
--
I'm just another stereotyped Surly Teenager! Doing what society expects of
me!
ro...@mauve.demon.co.uk
> Can't seem to find Bc547 transistors in amny places anymre. What can I use
> instead?
Look somewhere else.
They are still widely available.
I don't know if the TLD .moc is valid, or if it is, where it is, so
try http://www.digikey.com/ http://www.mouser.com/ http://www.farnell.com/
http://rswww.com/ http://www.theonion.com/
--
http://inquisitor.i.am/ | mailto:inqui...@i.am | Ian Stirling.
---------------------------+-------------------------+--------------------------
'Where subtlety fails, we must simply make do with cream pies' -- David Brin
g0mem
"Tony Gies" <command...@socyl.moc> wrote in message
news:Xns92F714C...@216.168.3.44...
> Can't seem to find Bc547 transistors in amny places anymre. What can I use
> instead?
What about a BC107 or 2N3904??
Mike Turner
G0MEM
Alan Holt
Jonathan Huber
exxos
"Tony Gies" <command...@socyl.moc> wrote in message
news:Xns92F714C...@216.168.3.44...
There are everywhere, use BC546, BC547,BC548,BC549, and if you really want
to go mad use a BC337 which is the 500ma version though same kinda thing!
chris
Watson 'Atto Parsec' Name
ro...@mauve.demon.co.uk mentioned...
> Tony Gies <command...@socyl.moc> wrote:
> > Can't seem to find Bc547 transistors in amny places anymre. What can I use
> > instead?
>
> Look somewhere else.
> They are still widely available.
> I don't know if the TLD .moc is valid, or if it is, where it is, so
> try http://www.digikey.com/ http://www.mouser.com/ http://www.farnell.com/
> http://rswww.com/ http://www.theonion.com/
Would you believe Lycos dot com? Look in the mirror...
Commander Keen? Wow, I used to play that all the time back in the 80s.
"Aliens Ate My Babysitter!" Someday I'll have to dig that floppy out
and try to load it up. ;-)
If your voltage requirements are not too high, then the BC548 will also
work. Or many other similar transistors, if the gain is not too high.
Like 2N4401, 2N3904, PN2222, etc. The BC547 was called a TUN, a
Transistor, Universal, NPN, in other words an everyday common jellybean
transistor. The one thing you should watch out for is to make sure the
substitute has the correct pinouts or else make accommodations for the
different pinouts.
Oh yeah, the reason that you don't see them around is because Radio
Scrap bought up a few million and put them in their packages of 15
assorted NPN transistors. The diff tho is that they had the leads
crimped so that the BCs fit three holes in a circle like the leads of a
TO-18 metal can. They have a diagram on the back that shows the in-line
packages as being E B C which is backwards from the BCs, which are
C B E. So they bent the leads and screwed up the pinout so the BCs are
B
E C
This is probably because the hobbyists looked at the diagram and then
tried plugging the BCs into the PC board the wrong way and complained to
Rat Shack that they sold him a bunch of dead transistors! :-?
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Subject: line. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
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Watson 'Atto Parsec' Name
mentioned...
> http://www.futurlec.com/TransGen.shtml#BCSeries
That's odd. I went to their website and ordered some BC337s and some 1%
MF resistors. The line item said $.10 for the BCs, but the shopping
cart showed $.07, so that's real Cheep! Cooooool.
What bothers me is that they say the shipment will be by ground, but
they don't give the carrier. Last time I ordered from All Elect, they
shipped it by U.S. Postal Svc(!) Which, in my experience, is the
biggest pain in the a$$ when it comes to collecting insurance on a
damaged package, which drives most mail order companies away from their
service.
Plus nowadays, I can't even drop a package at the post office without
waiting in long lines to have it accepted by the clerk. All those
anthrax scares last year (oops, the year before last) has made it real
tough for the P.O. customer. Pretty soon they'll want us to take our
shoes off at the door, like the airlines. :-P
UPS and FedEx are better, but not much.
Watson 'Atto Parsec' Name
mentioned...
> "Tony Gies" <command...@socyl.moc> wrote in message
> news:Xns92F714C...@216.168.3.44...
> > Can't seem to find Bc547 transistors in amny places anymre. What can I use
> > instead?
> > --
>
> There are everywhere, use BC546, BC547,BC548,BC549, and if you really want
> to go mad use a BC337 which is the 500ma version though same kinda thing!
>
> chris
I just ordered some of the BC337s. But I think they won't go up to a
couple hundred MHz like the 547s will. So it depends on what you're
gonna use them for. I want to drive some white LEDs with the BC337s;
they will be near saturation at 30 mA and hopefully their beta will hold
up so the base current won't be too great, since there will be six of
them in parallel. I've been using the 2N4401s with good success, but I
hope the BC337s will be even better.
I would use the 2N3053 but they're too big and too expensive. There was
one maker, I believe National, that used the same chip as the 2N3053 in
their MPSA06, I believe it was. So I would be able to get the high
current in a cheap plastic package. But if one orders some MPSA06s, the
dealer may not fill the order with the ones from that manufacturer. And
instead one might get the same cheap chip as the 2N2222 or whatever.
Another alternative is the Zetex high current transistors in the (even
smaller than) TO-92 package. But they're even more expensive than the
2N3053, like a buck apiece. :-(
Xposted to s.e.components
exxos
"Watson 'Atto Parsec' Name" <alond...@hotmail.com> wrote in message
news:MPG.1880ef6d1...@news.inreach.net...
337's are good if you just want them as a switch replacement for the 547, I
never looked into what they could switch at though never had any
problems....yet... Have you tried TIP3055 ? a little bit more "user
friendly" a little lower in wattage but easier to mount. Dont what what
prices they go for these days.....
Chris
Watson 'Atto Parsec' Name
mentioned...
The TIP whatevers are TO-220 or bigger cases and are way too large.
These are made for high power, a hundred watts, and I don't need any
more than a hundred or so mW, but just a lot of current for a small
signal transistor.
> Chris
Peter Crowcroft
<command...@socyl.moc> wrote:
>Can't seem to find Bc547 transistors in amny places anymre. What can I use
>instead?
I sell them at $US35/bag 1000 Philips brand. Or $US0.05 each (plus
postage.)
See
for more parts I sell. Any component I use in my kits I will sell
individually.
DIY Electronics (HK) Ltd
www.kitsrus.com
Martin Pickering {UK}
Watson 'Atto Parsec' Name <alond...@hotmail.com> wrote:
>Another alternative is the Zetex high current transistors in the (even
>smaller than) TO-92 package. But they're even more expensive than the
>2N3053, like a buck apiece. :-(
BC547 will be totally useless if you are pulsing an LED. We use the Zetex
ZTX650. You might get away with a ZTX450 which has slightly higher CE
voltage drop when hard on.
We use a tiny (really tiny) toroidal coil in an oscillator circuit capable
of driving six (6) 5600 mcd White LEDs in series to full brightness from a
1 volt cell.
Watson 'Atto Parsec' Name
> www.satcure.co.uk (Martin Pickering {UK}) wrote:
>
> > We use a tiny (really tiny) toroidal coil in an oscillator circuit capable
> > of driving six (6) 5600 mcd White LEDs in series to full brightness from a
> > 1 volt cell.
>
The one I used is a simple blocking osc with the LED across the emitter
and collector. It uses a single resistor in series with the feedback
winding, and that's about it. There's a .01 uF bypass cap across the
battery, but that's about it. Of course it's only driving a single LED.
> Michael
Watson 'Atto Parsec' Name
www.satcure.co.uk (Martin Pickering {UK}) mentioned...
I found that out when I built a V boost circuit from a single 1.5V cell
to just one white LED. Six of them in series is over 20V, a lot more
power. The peak current is high so a low power transistor with high
current is necessary. I've used a toroid with a bifilar winding and it
works, but it's just not bright enough with a 2N4401.
> Martin
> http://www.satcure-focus.com
R.Lewis
Watson 'Atto Parsec' Name wrote in message ...
>In article <BA43CDE8...@81-86-154-154.dsl.pipex.com>,
>www.satcure.co.uk (Martin Pickering {UK}) mentioned...
>> In article <MPG.1880ef6d1...@news.inreach.net>,
>> Watson 'Atto Parsec' Name <alond...@hotmail.com> wrote:
>>
>> >Another alternative is the Zetex high current transistors in the (even
>> >smaller than) TO-92 package. But they're even more expensive than the
>> >2N3053, like a buck apiece. :-(
>>
>> BC547 will be totally useless if you are pulsing an LED. We use the Zetex
>> ZTX650. You might get away with a ZTX450 which has slightly higher CE
>> voltage drop when hard on.
>>
>> We use a tiny (really tiny) toroidal coil in an oscillator circuit
capable
>> of driving six (6) 5600 mcd White LEDs in series to full brightness from
a
>> 1 volt cell.
>
>I found that out when I built a V boost circuit from a single 1.5V cell
>to just one white LED. Six of them in series is over 20V, a lot more
>power. The peak current is high so a low power transistor with high
>current is necessary. I've used a toroid with a bifilar winding and it
>works, but it's just not bright enough with a 2N4401.
>
look at the 2SC2500 but watch the volts.
the ZTX689b is made for the job
Watson 'Atto Parsec' Name
mentioned...
Thanks for the info.
Watson 'Atto Parsec' Name
I found a series og web pages that are essentially what I'm trying to
do, but they're in Japanese. :-(
http://www.geocities.co.jp/Technopolis-Mars/2881/LED02.html
They also use a high current, low power, small signal transistor, in
this case the 2SC2500. The circuit is the same except the one I used
just connected the LED across the transistor instead of rectifying and
filtering the output. So my circuit was even simpler than this one. I
wish I could get a rough translation. I'll have to ask the ladies in
our international student dept for some translation help.