See attach pic. Black stuff is hard. I put solder gun on it for heat, dipped in nail posh remover and alcohol but it wont soften or get off. How do I get rid of the black round thing on circuit board to reveal the components underneath?

 

It is likely some form of epoxy. Very hard to remove, if at all. That is why it is there....

 

https://medium.com/shyam-cortex/chip-on-board-manufacturing-a3c2ca378ef6

Don't do this at home.

Red fuming nitric acid works best.

 

How do I get rid of the black round thing on circuit board to reveal the components underneath?

I wouldn't do it. There's an integrated circuit under the blob and it protects bond wires.

 

I wouldn't do it. There's an integrated circuit under the blob and it protects bond wires.

I wonder how one can build such integrated circuit at home for hobbyist?

 

With the clean room and equipment necessary that is not a DIY project.

 

I wonder how one can build such integrated circuit at home for hobbyist?

If you need to ask, then, you can't do it.

 

If you need to ask, then, you can't do it.

Huh?

 

Huh?

Simple, it's practically impossible for you unless you already know at least the basics of semiconductor material science and solid state physics.

Substitute integrated circuit with fission reactor or supersonic aircraft.

 

Simple, it's practically impossible for you unless you already know at least the basics of semiconductor material science and solid state physics.

I know enough to build circuits from transistors diodes etc. i know enough how they work. So why cant i make those circuits in an ics?

 

I know enough to build circuits from transistors diodes etc. i know enough how they work. So why cant i make those circuits in an ics?

Are you really asking why. Your response makes my point exactly.

 

Are you really asking why. Your response makes my point exactly.

Your actually not helping

 

Your actually not helping

Yes. I'm just stating the obvious. Making integrated circuits is a completely different set of skills, knowledge and theory than making circuits of transistors and diodes.

 

Yes. I'm just stating the obvious. Making integrated circuits is a completely different set of skills, knowledge and theory than making circuits of transistors and diodes.

In Electrical Engineer with degree cannot make ICs? Dont have enough background hmmmm

 

I know enough to build circuits from transistors diodes etc. i know enough how they work. So why cant i make those circuits in an ics?

Please explain your interpretation of an IC.

 

Please explain your interpretation of an IC.

Stuff this forum members says that is under the black circle blob in the post #1 pic

 

Stuff this forum members says that is under the black circle blob in the post #1 pic

Most likely it's a physical microprocessor covered for protection and to prevent copying.
Do you mean to make a circuit out of discrete components call it an IC and cover it with epoxy?

 

In Electrical Engineer with degree cannot make ICs? Dont have enough background hmmmm

No, Most Electrical Engineers do not make IC's, they learn how to be experts building things with them, but not usually in depth how to design them from raw silicon to a finished product in a manufacturing environment. It a very specialized field that's talked about in the classic EE training tract but it's much more solid state physics based in background.

They are typically on the Process Engineering side of the house.
https://inquivixtech.com/semiconductor-process-engineer/

 

Most likely it's a physical microprocessor covered for protection and to prevent copying.
Do you mean to make a circuit out of discrete components call it an IC and cover it with epoxy?

Yes that what i meant. Also I want to know if i csn get that epoxy out and see the circuit how?

 

Also I want to know if i can get that epoxy out and see the circuit how?

I'm sure you can but most likely if completely eliminated the circuit will have been destroyed as mentioned earlier.
I don't know of any chemicals to use but I suppose sanding might work.