# Info on transistor testors?

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#### Dave

Jan 1, 1970
0
I am in the market for a transistor testor, but don't know what to look for.
What makes a good transistor testor? Anyone have any recommendations? I
have found one used Supercricket TF30 transistor/FET testor for about
$30.00, and another apparently higher-end unit for$150.00, but have no idea
why one is so cheap and the other is so expensive. (Sorry I can't remember
the make or model of the higher-end unit.) Input is greatly appreciated. I
am just a hobbyist, but I want to keep up the trend I have started of
getting decent equipment rather than cheapest/easiest to find.

Thanks,

Dave
[email protected]

R

#### Ross Mac

Jan 1, 1970
0
Dave said:
I am in the market for a transistor testor, but don't know what to look for.
What makes a good transistor testor? Anyone have any recommendations? I
have found one used Supercricket TF30 transistor/FET testor for about
$30.00, and another apparently higher-end unit for$150.00, but have no idea
why one is so cheap and the other is so expensive. (Sorry I can't remember
the make or model of the higher-end unit.) Input is greatly appreciated. I
am just a hobbyist, but I want to keep up the trend I have started of
getting decent equipment rather than cheapest/easiest to find.

Thanks,

Dave
[email protected]
I have always used an ohmmeter...it will not catch all types of failures,
but does work pretty well. I have seen some transistors, especially ones
used as switches, only fail at higher frequencies. For that failure, I just
remove the load, connect the scope and watch the square wave as I drive the
frequency up. There are alot of other ways to test them in circuit too, just
one example here!
There are a bunch of pretty sharp consumer electronics guys over at
sci.electronics.repair that may have some good suggestions for you.

D

#### Dave

Jan 1, 1970
0
Ross Mac said:
appreciated.
I have always used an ohmmeter...it will not catch all types of failures,
but does work pretty well. I have seen some transistors, especially ones
used as switches, only fail at higher frequencies. For that failure, I just
remove the load, connect the scope and watch the square wave as I drive the
frequency up. There are alot of other ways to test them in circuit too, just
one example here!
There are a bunch of pretty sharp consumer electronics guys over at
sci.electronics.repair that may have some good suggestions for you.

Sci.electronics.repair! GOOD IDEA! Thanks. I'll do that.

Dave
[email protected]

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