A: An lm317 is a negative 1.25v regulator
Full form of LM in any IC like LM317 is linear monolithic
LM stands for "Linear Monolithic"
Linear mode
It's a prefix of the IC products of 'Linear Monolithic' category of National semiconductors.
LM stand for Liner Monolithic ic that is the National Instrunt perfix, I My right
LM is a manufacturer's code--all LM chips were made by National Semiconductor. Similarly, SN chips were made by Texas Instruments.
linear monolithic
The "LM" stands for Linear Monolithic" and is just part of the part-number that National decided to use for this famous timer IC. The LM prefix is still used for a lot of medium complexity analog chips, like regulators and op-amps.
The non-inverting pins of the LM393 are 3 and 5.
A 2N3904 is the one in this package.
LM stands for "NATIONAL SEMICONDUCTORS". i.e, that particular ic has been manufactured by "NATIONAL SEMICONDUCTORS". infact on any ic two letters indicate the manufacturing company's name,eg MC stands for Motorola(now freescale),SN for Texas instruments,NS for signetics, CM for California microelectronics and so on...
NTC is negative temp coefficient transducer,working with resistor while lm 35 is an IC type transducer