Alt-BEAM Archive
Message #04532
To: beam@sgiblab.sgi.com
From: Bruce Robinson Bruce_Robinson@bc.sympatico.ca
Date: Tue, 15 Jun 1999 17:54:38 -0700
Subject: [alt-beam] Re: Transistor confusion
Bob Shannon wrote:
>
> This is easy...
>
> SG wrote:
>
>> hey, i am confused, i went to the big city and stoped by an industrial
>> electronics store, told them i wanted some 2n3904's. bought ten of
>> them., when i got home i noticed the package said: ECG 123 AP
>> dosn't say 3904 anywhere... is this a compatible transistor or did i
>> get ripped off?
>
> Well, sorta...
>
> ECG123A is a substitute for the common 2N2222 NPN transistor, which will
> work in a 1381 SE. Quite well actually.
>
> But if you asked for 3904's, then you ought to get 3904's. They are real
> common.
Bob's right. However -- both 2N2222's (or PN2222's) and 2N3904's are NPN
transistors, and I've used them both in H-bridges without any problems.
My suggestion is try one and see.
>>
>> are the ecg 123 ap's what i want?
>
> Not of your looking for a PNP, but they should work fine as the motor
> driver transistor in a 1381 SE.
I think sparky's looking for an NPN.
Bruce.
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