transistor tester

J

Jim Lazzaro

Guest
I have obtain(secondhand) a Dick Smith transistor tester for which the
instuctions manual was not included.
I would appreciate if anyone can tell me how to use it: I can connect
the components to check but I don't understand what I am looking for
on the current meter face.
Thanks
 
"Jim Lazzaro" <
I have obtain(secondhand) a Dick Smith transistor tester for which the
instuctions manual was not included.
I would appreciate if anyone can tell me how to use it: I can connect
the components to check but I don't understand what I am looking for
on the current meter face.
Click to expand...

** Describe the meter - its functions, controls etc.

DSE sold several different designs.




............. Phil
 
"Jim Lazzaro" wrote


I have obtain(secondhand) a Dick Smith transistor tester for which the
instuctions manual was not included.
I would appreciate if anyone can tell me how to use it: I can connect
the components to check but I don't understand what I am looking for
on the current meter face.


*** Translation follows:-

I haven't got a clue how a transistor works and I want someone to
explain
to me in two lines how it does!

The mind boggles!!!!!

Brian Goldsmith.
 
The tester has a button to press to check the gain; the meter itself
has a scale showing mA.
Should the needle move all the way up the scale to test good or is a
small change enough to prove that the transistor is in working order?
Thanks
Jim




"Brian Goldsmith" <brian.goldsmith@nospamecho1.com.au> wrote in message news:<D6eBc.45845$sj4.1321@news-server.bigpond.net.au>...
"Jim Lazzaro" wrote


I have obtain(secondhand) a Dick Smith transistor tester for which the
instuctions manual was not included.
I would appreciate if anyone can tell me how to use it: I can connect
the components to check but I don't understand what I am looking for
on the current meter face.


*** Translation follows:-

I haven't got a clue how a transistor works and I want someone to
explain
to me in two lines how it does!

The mind boggles!!!!!

Brian Goldsmith.
Click to expand...
 
"Jim Lazzaro" <Jim_Lazzaro@hotmail.com> wrote in message
news:fae7122f.0406201918.165cb71a@posting.google.com...
The tester has a button to press to check the gain; the meter itself
has a scale showing mA.
Should the needle move all the way up the scale to test good or is a
small change enough to prove that the transistor is in working order?
Thanks
Jim
Click to expand...
Depends on the Transistor and how much gain it is supposed to have!
There usually should at least be a change between pressing the button and
not pressing the button but really the piece of info you should provide is
which Transistor tester is it ? DSE have sold several different types over
the years if you tell us this or provide a picture someone here may have a
copy of the instructions or know the unit ....

Regards
Richard Freeman
 
"Jim Lazzaro" <
The tester has a button to press to check the gain; the meter itself
has a scale showing mA.
Click to expand...

** You have the 1978 EA transistor tester ( pcb: 78 tfc 7 ) - or the
DSE kit thereof.

There are two ranges for current gain or "beta" - 0 to 1000 ( at 1 mA
FSD) when the bipolar /fet switch is in the "bipolar" position and 0 to 100
( at 10 mA FSD) when it is in the "fet" position.


Should the needle move all the way up the scale to test good or is a
small change enough to prove that the transistor is in working order?
Click to expand...

** The unit is a transistor beta tester when the gain button is pressed -
the actual reading depends on the type of transistor on test. You need to
know in advance what it should read by looking at some specs.

It is **not suitable** for testing the beta of high powered transistors,
most darlington types or TV horizontal deflection types.

EA magazine also published a "Power Transistor Tester" design for the
latter types, designed by me in response to the limitations of the meter you
have.




............... Phil
 
On Mon, 21 Jun 2004 13:52:41 +1000, "Phil Allison"
<philallison@tpg.com.au> wrote:


EA magazine also published a "Power Transistor Tester" design for the
latter types, designed by me in response to the limitations of the meter you
have.




.............. Phil
Click to expand...
I am interested in your power transistor tester Phil, I am sure other
readers here would be too. Do you have a web site where we
may see it and read about it?
Regards,
John Crighton
Hornsby
 
"John Crighton" <john_c@tpg.com.au> wrote in message
news:40d68115.27592050@News.individual.net...
On Mon, 21 Jun 2004 13:52:41 +1000, "Phil Allison"
philallison@tpg.com.au> wrote:


EA magazine also published a "Power Transistor Tester" design for the
latter types, designed by me in response to the limitations of the meter
you
have.




.............. Phil


I am interested in your power transistor tester Phil, I am sure other
readers here would be too. Do you have a web site where we
may see it and read about it?
Regards,
John Crighton
Hornsby
Click to expand...
John
Drop by one day I have one - it is actually a frighteningly simple but
effective circuit ....

Regards
Richard Freeman
 
"John Crighton"

Phil Allison:

EA magazine also published a "Power Transistor Tester" design for the
latter types, designed by me in response to the limitations of the meter
you
have.



I am interested in your power transistor tester Phil, I am sure other
readers here would be too. Do you have a web site where we
may see it and read about it?
Click to expand...

** It was published in EA in May 1988 as a "Simple Tester for Power
Transistors". There was no PCB since the wiring needed was quite minimal.
Altronics sold a kit for it for a few years - K 2532.

It measured the beta of any bipolar power transistor or power darlington at
a fixed Ic of 600 mA, plus allowed for Vbe matching of sets at the same
time. It operated from an external 12 volt supply or battery.





.............. Phil
 
i do!
a transistor is an electronic switch,
with a small curent applied to the
base, it passes current between collector
and emiter.



"Brian Goldsmith" <brian.goldsmith@nospamecho1.com.au> wrote in message
news:D6eBc.45845$sj4.1321@news-server.bigpond.net.au...
"Jim Lazzaro" wrote


I have obtain(secondhand) a Dick Smith transistor tester for which the
instuctions manual was not included.
I would appreciate if anyone can tell me how to use it: I can connect
the components to check but I don't understand what I am looking for
on the current meter face.


*** Translation follows:-

I haven't got a clue how a transistor works and I want someone to
explain
to me in two lines how it does!

The mind boggles!!!!!

Brian Goldsmith.
Click to expand...
 
John
Drop by one day I have one - it is actually a frighteningly simple but
effective circuit ....

Regards
Richard Freeman


Hello Richard,
Click to expand...
OK I'll do that.
CU
JC
 
On Mon, 21 Jun 2004 16:58:07 +1000, "Phil Allison"
<philallison@tpg.com.au> wrote:

"John Crighton"

Phil Allison:

EA magazine also published a "Power Transistor Tester" design for the
latter types, designed by me in response to the limitations of the meter
you
have.



I am interested in your power transistor tester Phil, I am sure other
readers here would be too. Do you have a web site where we
may see it and read about it?


** It was published in EA in May 1988 as a "Simple Tester for Power
Transistors". There was no PCB since the wiring needed was quite minimal.
Altronics sold a kit for it for a few years - K 2532.

It measured the beta of any bipolar power transistor or power darlington at
a fixed Ic of 600 mA, plus allowed for Vbe matching of sets at the same
time. It operated from an external 12 volt supply or battery.





............. Phil
Click to expand...
Thanks for that, I'll have a look at Richards unit.
Regards,
John Crighton
 
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