scopes [was: how to troubleshoot? ...]

[Dave Halliday]

http://www.techlib.com/electronics/curvetrace.html

A simple circuit and very useful.

I found this by looking through the following wonderful web site:
http://www.us-epanorama.net/
Spend some time drilling down on this one - it's worth it.


Dave

-----Original Message-----
From: Scott Gravenhorst [mailto:music.maker at gte.net]
Sent: Wednesday, January 17, 2001 3:31 AM
To: synth-diy at node12b53.a2000.nl
Subject: Re: scopes [was: how to troubleshoot? ...]


This sounds like a handly little gadget to have around, and
being simple invites building it.  Anybody know of schemos?

"Synthusiast" <synthusiast1 at yahoo.com> wrote:
>> All this talk about multiple inputs on scopes got me thinking about
>> something I built to use with my scope way back in the 70s when I was
>still
>> in 'lectronics school.  It is a transistor checker.  It hooks to both
vert
>> and horiz scope inputs and displays bent lines on the scope to define
each
>> junction.  Base to emitter junctions display a line with two 90 degree
>bends
>> on opposite directions.  Connecting E to C or B to C gives a line with a
>> single 90 degree bend.  So, I dug it out of the junk, hooked it up to my
>> scope and yes, it still does the same thing it did.  I remember checking
a
>> lot of transistors with this thing in the 70s when my supply for projects
>> was whatever I could get my hands on.
>>
>> I have no idea where I got the plans or idea for the circuit.  Perhaps
>from
>> popular electronics or something.  It has a selector for in and out of
>> circuit testing.  There is not much to it.  it contains a AC 120 / 6.3
>volt
>> transformer, a couple of resistors and switches, and that is it.  Anyone
>> remember such a "test" circuit or have any opinions about its usefulness.
>I
>> remember it helped me sort a lot of transistors in to the "good" and
"bad"
>> piles.  If nothing else, you can identify the leads on an unmarked
>> transistor.
>>
>> Larry Hendry
>> (still trying to remember half of that stuff I learned back then)
>
>My 10-year-old Hameg scope has a feature called 'component tester' which
>matches the description you give. I never used it tho. The feature is still
>implemented on newer Hameg models.
>
>Cheers,
>Synthusiast
>
>
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-- Scott Gravenhorst : Done the Edge, Now What?
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