Author Topic: seeking little Ge transitor tester project  (Read 1840 times)

LizardKing

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seeking little Ge transitor tester project
« on: December 26, 2014, 09:49:26 PM »
Anyone have a little project to make a tester to test gain and leakage of Ge trannies?
I have a collection of trannies I'd like to test and mark for future projects and wouldn't mind
making a neat test fixture to do it with!


Soup39

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Re: seeking little Ge transitor tester project
« Reply #1 on: December 27, 2014, 12:59:15 PM »
I think I have a spare etched board.  let me check the stack, if I do it's yours.

LizardKing

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Re: seeking little Ge transitor tester project
« Reply #2 on: December 27, 2014, 05:27:28 PM »
I think I have a spare etched board.  let me check the stack, if I do it's yours.

That is very nice, but I can etch my own boards if you can lead me to the docs.
Even the name of the project would help, I've googled up nothing!

selfdestroyer

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Re: seeking little Ge transitor tester project
« Reply #3 on: December 27, 2014, 05:46:11 PM »
Rullywow made one  sometime ago and I think it was verified.

https://drive.google.com/file/d/0B7EnzxavIi5_dkYyWXJPSXdlWlE/view?usp=sharing

Give it a try.

Cody

Soup39

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Re: seeking little Ge transitor tester project
« Reply #4 on: December 27, 2014, 07:04:08 PM »
funny, the extra I have is rullywow. 

LizardKing

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Re: seeking little Ge transitor tester project
« Reply #5 on: December 28, 2014, 09:04:53 AM »
funny, the extra I have is rullywow.
IC, never heard of it.
That link gives me a:
We're sorry. You can't access this item because it is in violation of our Terms of Service.

Are y'all referring to this: http://www.rullywow.com/jfet-matcher-project-vgsoff/ ?
I did find the build docs with the pcb so I can etch one, THANKS!
Does anyone use an old Heathkit transistor testor such as an IM30?
I think I have one somewhere....



davent

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Re: seeking little Ge transitor tester project
« Reply #6 on: December 28, 2014, 05:56:56 PM »
That one serves a different purpose. Here's a vero layout for a tester, if you add another strip of vero at the top and jumper it to the "E" strip you can test any transistor pinout without having to contort the leads.

http://tagboardeffects.blogspot.ca/2012/08/germanium-transistor-tester.html
dave
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LizardKing

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Re: seeking little Ge transitor tester project
« Reply #7 on: December 28, 2014, 07:11:33 PM »
That one serves a different purpose. Here's a vero layout for a tester, if you add another strip of vero at the top and jumper it to the "E" strip you can test any transistor pinout without having to contort the leads.

http://tagboardeffects.blogspot.ca/2012/08/germanium-transistor-tester.html
dave

Ah yes, this is the one that had wondering if someone had ever made a little project that didn't require a dmm or any math (direct reading).
I am thinking the answer is not.
Anyone interested in such a thing?
A cheap lcd, and arduino, and a simple board with power could be whipped up without too much trouble...

davent

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Re: seeking little Ge transitor tester project
« Reply #8 on: December 28, 2014, 07:30:51 PM »
There's a little cheap chinese bare bones meter available that does a pile of useful tests for us outside the DMM realm, someplace 'round here there is a link. Not sure is does leakage but that's easy enough to test for.
"If you always do what you always did- you always get what you always got." - Unknown

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culturejam

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Re: seeking little Ge transitor tester project
« Reply #9 on: December 28, 2014, 11:26:09 PM »
There's a little cheap chinese bare bones meter available that does a pile of useful tests for us outside the DMM realm, someplace 'round here there is a link. Not sure is does leakage but that's easy enough to test for.

I got a cheap Chinese tester and it does everything (resistors, capacitors, inductors, transistors), including leakage. It even measures ESR for electrolytic caps.

Here's more info:
http://www.madbeanpedals.com/forum/index.php?topic=16393.0

davent

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Re: seeking little Ge transitor tester project
« Reply #10 on: December 28, 2014, 11:32:46 PM »
Yup, that's the one i was thinking of, thanks!
dave
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culturejam

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Re: seeking little Ge transitor tester project
« Reply #11 on: December 29, 2014, 01:06:16 AM »
I use mine all the time. Basically, I use it for everything that isn't testing voltage or current draw.

LizardKing

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Re: seeking little Ge transitor tester project
« Reply #12 on: December 31, 2014, 05:26:26 PM »
Doing the research on this project, thanks!