LM7805 is not a microcontroller. LM7805 is an +5.0V 1A voltage regulator.
The term LM7805 refers to a type of semiconductor. The number tells what kind it is and what the voltage output is. More information about this can be found online.
positive 5 volts
The case of the TO-220 LM7805 regulator is device ground. If the heatsink is also ground, you do not need an insulator. If the heatsink is not ground, or if you need to maintain distinct grounds, or if the LM7805 ground is something else besides ground, you need an insulator. Its up to you, since you are responsible for system and circuit design.
what is IS-LM?
lm; lm;
LM is a manufacturer's code--all LM chips were made by National Semiconductor. Similarly, SN chips were made by Texas Instruments.
New LM was created in 1976.
LM stands for "Linear Monolithic"
Linear mode
LM stands for Linear Monolithic, indicating that the LM-35 temperature sensor is a linear integrated circuit used for temperature sensing applications.
The abbreviation "LM" in soccer refers to the Left Midfielder.