Transistors Replacements

C

Chretien

Guest
I'm trying to build a circuit that calls for these three Transistors.
My local guy does not have them. I would rather buy from him than some place
I have to have them shipped into, added cost etc.

Who knows they may be obsolete?

Does anyone have a book or something where they can look up replacements for
these that might be more available.

BC212
BD132
BC182

The circuit would like to build is at :

http://www.atv-projects.com/html/nicd_zapper.html

Thanks.
 
"BobG" <bobgardner@aol.com> wrote in message
news:1112119649.080034.142210@f14g2000cwb.googlegroups.com...
Looks like any ol transisitor that will handle 12V and 2 A will work.
Click to expand...
Thanks.

I am a novice and tend to slavishly follow schematics. However I know that
many circuits can use as you say any old transistor. I don't always
understand why, accept to say that I suppose the circuits are so heavy
handed and non specific that almost anything will do so long as the are NPN
or PNP.

Thanks again.
 
"Chretien" <Cretian@123.com> wrote:

BC212
BD132
BC182

The circuit would like to build is at :
http://www.atv-projects.com/html/nicd_zapper.html
Click to expand...
In the well known electronics magazine Elektor they use the acronyms tun
and tup to mean transistor universal npn(pnp).

The requirements for these transistor are something like this:
Max collector voltage min 30V, hFE min 200, max current min 100mA.

Thousands, if not millions, of small signal transistors meet these
requirements, and you can use any of them in most circuits.
Elektor use those basic types in many of their circuits.

In your circuit 3 are such small signal transistors and there is no
special requirements as far as I can see. The power source is
12 Volt, and practically all transistors ever made can be used when we
consider the maximum voltage alone.

The BD type is a power transistor which need to be able to handle 2Amp
momentarily.

There are circuits where other parameters mean a lot, like in an audio
preamp if it says BC109c it means a low noise transistor with a hFE above
500 or so. But your circuit does not seem to need any special types. Take
what you have and it will probably work just as well as with the named
types.

A well known tun is BC107 (108,109), a well known tup is BC177 (178,179).
The numbers ending in 9 in these series denote low noise types, but they
can take less maximum voltage. (30V instead of 60V for the 107 and 108
types) If there is a letter at the end it shows the hFE value.

BC107b = General purpose npn small signal transistor with medium amplification
factor, hFE = 300-500 or so.

All numbers above are approximative, different manufacturers have
slightly different values.

Check out these links:
http://www.uoguelph.ca/~antoon/circ/tuptun.htm
http://www.uoguelph.ca/~antoon/gadgets/gadgets.htm


--
Roger J.
 
Chretien wrote:

I'm trying to build a circuit that calls for these three Transistors.
My local guy does not have them. I would rather buy from him than some place
I have to have them shipped into, added cost etc.

Who knows they may be obsolete?

Does anyone have a book or something where they can look up replacements for
these that might be more available.

BC212
BD132
BC182

The circuit would like to build is at :

http://www.atv-projects.com/html/nicd_zapper.html

Thanks.


http://www.datasheetcatalog.com/catalog/p47320.shtml
Click to expand...

those are generic type PNP and NPN signal transistors.
from what i can see.
 
"Chris" <cfoley1064@yahoo.com> wrote in message
news:1112131648.968730.134190@o13g2000cwo.googlegroups.com...
Chretien wrote:
I'm trying to build a circuit that calls for these three Transistors.
My local guy does not have them. I would rather buy from him than
some place
I have to have them shipped into, added cost etc.

Who knows they may be obsolete?

Does anyone have a book or something where they can look up
replacements for
these that might be more available.

BC212
BD132
BC182

The circuit would like to build is at :

http://www.atv-projects.com/html/nicd_zapper.html

Thanks.

Hi, Chretien. If you can't find the specified parts for a hobbyist
project, you might want to try NTE replacement semiconductors. They're
made for repair and engineering prototype stuff. Their cross-reference
page is

http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/$$Search?OpenForm

You can frequently find what you need there.

I did a quick search on their cross-reference page, and came up with
the following:

BC212=NTE159
BD132=NTE242
BC182=NTE123AP

If you can't find NTE parts locally, you can always get them out of the
Mouser catalog

http://www.mouser.com/

(By the way, please wear eye protection when you use your NiCd zapper
circuit. Also, try using a 12V automotive bulb as a load when checking
out your circuit, before you try a battery.)

Good luck
Chris
Click to expand...
Hey thanks thats that will be a great help in the future.
 
"Roger Johansson" <no-email@no.invalid> wrote in message
news:Xns96292485F4B1086336@81.174.12.30...
"Chretien" <Cretian@123.com> wrote:

BC212
BD132
BC182

The circuit would like to build is at :
http://www.atv-projects.com/html/nicd_zapper.html

In the well known electronics magazine Elektor they use the acronyms tun
and tup to mean transistor universal npn(pnp).

The requirements for these transistor are something like this:
Max collector voltage min 30V, hFE min 200, max current min 100mA.

Thousands, if not millions, of small signal transistors meet these
requirements, and you can use any of them in most circuits.
Elektor use those basic types in many of their circuits.

In your circuit 3 are such small signal transistors and there is no
special requirements as far as I can see. The power source is
12 Volt, and practically all transistors ever made can be used when we
consider the maximum voltage alone.

The BD type is a power transistor which need to be able to handle 2Amp
momentarily.

There are circuits where other parameters mean a lot, like in an audio
preamp if it says BC109c it means a low noise transistor with a hFE above
500 or so. But your circuit does not seem to need any special types. Take
what you have and it will probably work just as well as with the named
types.

A well known tun is BC107 (108,109), a well known tup is BC177 (178,179).
The numbers ending in 9 in these series denote low noise types, but they
can take less maximum voltage. (30V instead of 60V for the 107 and 108
types) If there is a letter at the end it shows the hFE value.

BC107b = General purpose npn small signal transistor with medium
amplification
factor, hFE = 300-500 or so.

All numbers above are approximative, different manufacturers have
slightly different values.

Check out these links:
http://www.uoguelph.ca/~antoon/circ/tuptun.htm
http://www.uoguelph.ca/~antoon/gadgets/gadgets.htm


--
Roger J.
Click to expand...
Roger,

Thanks for the tutorial it was extremely helpful. Here and I thought all
those letters where just manf codes.
I'm printing off your message and will keep it in my transistor file for
future reference. The web links were very useful also. I have actually made
a few of Mr Toons projects but somehow didn't see those links.

I have to say this newsgroup is one of the most helpful I have ever used. I
always seem to get some help when I need it.

Thanks again.
 
Looks like any ol transisitor that will handle 12V and 2 A will work.
 
Chretien wrote:
I'm trying to build a circuit that calls for these three Transistors.
My local guy does not have them. I would rather buy from him than
some place
I have to have them shipped into, added cost etc.

Who knows they may be obsolete?

Does anyone have a book or something where they can look up
replacements for
these that might be more available.

BC212
BD132
BC182

The circuit would like to build is at :

http://www.atv-projects.com/html/nicd_zapper.html

Thanks.
Click to expand...
Hi, Chretien. If you can't find the specified parts for a hobbyist
project, you might want to try NTE replacement semiconductors. They're
made for repair and engineering prototype stuff. Their cross-reference
page is

http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/$$Search?OpenForm

You can frequently find what you need there.

I did a quick search on their cross-reference page, and came up with
the following:

BC212=NTE159
BD132=NTE242
BC182=NTE123AP

If you can't find NTE parts locally, you can always get them out of the
Mouser catalog

http://www.mouser.com/

(By the way, please wear eye protection when you use your NiCd zapper
circuit. Also, try using a 12V automotive bulb as a load when checking
out your circuit, before you try a battery.)

Good luck
Chris
 
I am a novice and tend to slavishly follow schematics. However I know
that
many circuits can use as you say any old transistor. I don't always
understand why,
===============================
Click to expand...
The rule of thumb is that the transistor needs to withstand the voltage
and current from the circuit, so over spec-ing the transistor just
hurts your wallet. Same with caps... you can use a 50v cap in a 5v
circuit, but not vice-versa
 
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