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Old 16th December 2003, 05:28 PM   #1
MaXiZ is offline MaXiZ  Italy
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Default What mean?

I know that may appear like a really stupid question but what mean these two symbol? Thanx!
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Old 16th December 2003, 05:46 PM   #2
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a trasistor with a heatsink (left) and a thermistor (right)

im not perfectly sure about the thermistor though...
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Old 16th December 2003, 05:48 PM   #3
qwad is offline qwad  Australia
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first one is a transistor[ not sure if a pnp /npn] second is an adjustable resistor for setting bias etc, along with its value, ppl with more knowledege than me, will correct me if I am wrong; cheers Tomcat
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Old 16th December 2003, 05:53 PM   #4
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a trimer? (the second one)
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Old 16th December 2003, 05:57 PM   #5
dhaen is offline dhaen  Europe
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Quote:
Originally posted by MaXiZ
a trimer? (the second one)
Yes
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Old 16th December 2003, 06:12 PM   #6
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Quote:
Originally posted by qwad
first one is a transistor[ not sure if a pnp /npn] ....

there is some mnemonic for this...I THINK it's this:

NPN is 'Never Points iN

PNP is 'Points iN Perpetually

someone please correct me if i am mistaken. i'm not an EE guy, i just read a basic textbook recently.

/andrew - dammit jim, i'm an architect, not an electrical engineer!
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Old 16th December 2003, 06:14 PM   #7
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Post Transistor and Pot

Quote:
Originally posted by qwad
first one is a transistor[ not sure if a pnp /npn] second is an adjustable resistor for setting bias etc, along with its value, ppl with more knowledege than me, will correct me if I am wrong; cheers Tomcat

Its a NPN transistor and a variable resistor or trimmerpot. Pot being short for potentiometer.
Page 61 a.f. in Horowitz. Have you searched H.??
Quote:
"A transistor is a 3-terminal device (Fig.2.1) available in two flavors (npn) and (pnp) with properties that meet......."
BTW I am a bloody chemist.
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Old 16th December 2003, 06:26 PM   #8
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thanx to all for the answer!
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