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Electronic schematic question. Distinction of transistors. Login/Join 
W07VH5
Picture of mark123
posted
This is something I've not come across and i don't remember there being a schematic distinction between transistors. They are both NPN but one shows the base as a line and the other as a rectangle. Why the distinction?

 
Posts: 45330 | Location: Pennsyltucky | Registered: December 05, 2001Reply With QuoteReport This Post
Baroque Bloke
Picture of Pipe Smoker
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AFAIK, that isn’t standard notation. Maybe Q5 is a power transistor whereas Q1 is a small signal transistor.



Serious about crackers
 
Posts: 8851 | Location: San Diego | Registered: July 26, 2014Reply With QuoteReport This Post
Cold Ass Honkey
Picture of Sig Vicious
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My guess is a BJT.

https://www.electronics-notes....nsistors-bipolar.php


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Posts: 2173 | Location: OR-ee-GUN | Registered: December 18, 2005Reply With QuoteReport This Post
W07VH5
Picture of mark123
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quote:
Originally posted by Sig Vicious:
My guess is a BJT.

https://www.electronics-notes....nsistors-bipolar.php
All NPNs and PNPs are bipolar junction transistors.
 
Posts: 45330 | Location: Pennsyltucky | Registered: December 05, 2001Reply With QuoteReport This Post
W07VH5
Picture of mark123
posted Hide Post
quote:
Originally posted by Pipe Smoker:
AFAIK, that isn’t standard notation. Maybe Q5 is a power transistor whereas Q1 is a small signal transistor.
That seems plausible. I'll have to check the rest of the circuit to see if that's the case.
 
Posts: 45330 | Location: Pennsyltucky | Registered: December 05, 2001Reply With QuoteReport This Post
Member
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AARL may have instructional material for ham radio operators online, where these distinctions are described.


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Posts: 5041 | Location: Commonwealth of Virginia | Registered: January 15, 2007Reply With QuoteReport This Post
Ignored facts
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can you share the rest of the circuit? that could give some hints.

maybe an IGBJT? Just guessing.


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Let's Go Brandon!
 
Posts: 10860 | Location: 45 miles from the Pacific Ocean | Registered: February 28, 2003Reply With QuoteReport This Post
W07VH5
Picture of mark123
posted Hide Post
quote:
Originally posted by radioman:
can you share the rest of the circuit? that could give some hints.

maybe and IGBJT? Just guessimg.
It's the schematic for what's inside an LMx08:
http://www.mit.edu/~6.301/LM108.pdf
 
Posts: 45330 | Location: Pennsyltucky | Registered: December 05, 2001Reply With QuoteReport This Post
Baroque Bloke
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When I first looked at this schematic (half way down the page), it appeared that all NPNs had the rectangular base, and all PNPs had the thin base. But then I noticed Q1, Q2, and Q4. Dang, that theory is shot.

http://www.righto.com/2016/12/...p-superbeta.html?m=1

But if Q13 is a power transistor, then Q14 ought to be a power transistor too, so just don’t know…



Serious about crackers
 
Posts: 8851 | Location: San Diego | Registered: July 26, 2014Reply With QuoteReport This Post
W07VH5
Picture of mark123
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I wonder if it is just something as simple as two people worked on the drawing using their own style.
 
Posts: 45330 | Location: Pennsyltucky | Registered: December 05, 2001Reply With QuoteReport This Post
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Looks like one draftsman. Difference may be the construction details within the op amp on the chip substrate. Hard to tell.
 
Posts: 1190 | Location: Moved to N.W. MT. | Registered: April 26, 2009Reply With QuoteReport This Post
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? This link might indicate P\N Channel MOSFETS?

https://cdn.sparkfun.com/asset...ce395f7558000002.png

Definitely looks like a purposeful difference.


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The butcher with the sharpest knife has the warmest heart.
 
Posts: 13386 | Location: Bottom of Lake Washington | Registered: March 06, 2007Reply With QuoteReport This Post
Ignored facts
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The answer my friend is in this book, on printed page 50, location 75 in this scan:

https://archive.org/details/Na...andbook1994/page/n75

note the lower gain (beta) transistors have the wider base rectangle. These also have a higher breakdown voltage.



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Let's Go Brandon!
 
Posts: 10860 | Location: 45 miles from the Pacific Ocean | Registered: February 28, 2003Reply With QuoteReport This Post
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Dang Radioman, You are good buddy. That answer is a real Elmer for sure.

Thanks.
W5SCM


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"We the people are the rightful masters of both Congress and the courts, not to overthrow the Constitution but to overthrow the men who pervert the Constitution" - Abraham Lincoln

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Posts: 1143 | Location: Little Rock, AR | Registered: January 22, 2003Reply With QuoteReport This Post
W07VH5
Picture of mark123
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Excellent work, my good man. I owe you an instakarma.
 
Posts: 45330 | Location: Pennsyltucky | Registered: December 05, 2001Reply With QuoteReport This Post
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