This post explains for the Regulator.
The Part Number is 7812A, MC7812A.
The function of this semiconductor is 12V, Voltage Regulator.
The package is TO-220, D2Pak Type
Manufacturer: ON Semiconductor
Preview images :
Description
7812A is 1A, 12V, Positive Voltage Regulator.
These voltage regulators are monolithic integrated circuits designed as fixed−voltage regulators for a wide variety of applications including local, on−card regulation. These regulators employ internal current limiting, thermal shutdown, and safe−area compensation. With adequate heatsinking they can deliver output currents in excess of 1.0 A. Although designed primarily as a fixed voltage regulator, these devices can be used with external components to obtain adjustable voltages and currents.
Block Diagram:
Features:
• Output Current in Excess of 1.0 A
• No External Components Required
• Internal Thermal Overload Protection
• Internal Short Circuit Current Limiting
• Output Transistor Safe−Area Compensation
• Output Voltage Offered in 2% and 4% Tolerance
• NCV Prefix for Automotive and Other Applications Requiring Site and Control Changes
• Pb−Free Packages are Available
7812A PDF Datasheet
