Print Page - 2pin and 4pin transistors

Title: 2pin and 4pin transistors
Post by: 2tonewarrior on July 31, 2012, 03:35:09 PM

Hi, I´ve 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

Title: Re: 2pin and 4pin transistors
Post by: sgmezei on July 31, 2012, 08:42:20 PM

From what I have read the 4th pin is for grounding the case. Mine work without grounding it if that helps.

Title: Re: 2pin and 4pin transistors
Post by: 2tonewarrior on August 01, 2012, 08:58:34 AM

Quote from: sgmezei on July 31, 2012, 08:42:20 PM
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?

Title: Re: 2pin and 4pin transistors
Post by: mgwhit on August 01, 2012, 09:06:57 AM

I read somewhere last night that the T0-3 format uses the case itself as the third pin!

Title: Re: 2pin and 4pin transistors
Post by: 2tonewarrior on August 01, 2012, 11:29:36 AM

Quote from: mgwhit on August 01, 2012, 09:06:57 AM
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.

Title: Re: 2pin and 4pin transistors
Post by: mgwhit on August 01, 2012, 12:15:10 PM

http://www.interfacebus.com/semiconductor-transistor-packages-TO-3.html

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Projects => How Do I? Beginner's Paradise. => Topic started by: 2tonewarrior on July 31, 2012, 03:35:09 PM