Author Topic: 2pin and 4pin transistors  (Read 3143 times)

2tonewarrior

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2pin and 4pin transistors
« on: July 31, 2012, 04:35:09 PM »
Hi, Ive recently seen several Ge transistors with two pins and four pins. Where is the missing pin in the 2-pin ones? and what the 4 pin are for in the others?

The first looks like this one http://www.techzonics.com/2ad149-germanium-transistors.jpg and the second one is this http://www.radiomuseum.org/images/tubephoto_klein/af138_1.jpg


Thanks
« Last Edit: July 31, 2012, 04:51:52 PM by 2tonewarrior »

sgmezei

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Re: 2pin and 4pin transistors
« Reply #1 on: July 31, 2012, 09:42:20 PM »
From what I have read the 4th pin is for grounding the case. Mine work without grounding it if that helps.

2tonewarrior

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Re: 2pin and 4pin transistors
« Reply #2 on: August 01, 2012, 09:58:34 AM »
From what I have read the 4th pin is for grounding the case. Mine work without grounding it if that helps.

Thanks!, good to know that. What about the 2-pin ones, anyone?

mgwhit

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Re: 2pin and 4pin transistors
« Reply #3 on: August 01, 2012, 10:06:57 AM »
I read somewhere last night that the T0-3 format uses the case itself as the third pin!

2tonewarrior

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Re: 2pin and 4pin transistors
« Reply #4 on: August 01, 2012, 12:29:36 PM »
I read somewhere last night that the T0-3 format uses the case itself as the third pin!

Thanks for the info, I figured it would be like, so the holes for the screws. Thanks you two!

Damn, every time i translate something with google translate it seems to me worst than if i would try to write it by myself.

mgwhit

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