Inside a calculator

Replies

• 

  Saandeep Sreerambatla

  In general words , Calculator works on the calculations using logic gates.
  It involves CMOS (Complementary metal-oxide-semiconductor) Technology for the circuit.
• 

  nenuadwani

  Ya I am aware of that. I have found out that a small IC is attched to the chip which stores the programming. But the model i opened had the circuit made on a polythene like structure and the circuit was painted with black similar to a layout on a PCB. I still want to know the detailed working.
• 

  Saandeep Sreerambatla

  you can design a basic calculator using logical gates rite?
• 

  nenuadwani

  thats right. But what about the plastic material on which the circuit is drawn. How signals move through that?
• 

  aj_onduty

  nenuadwani

  thats right. But what about the plastic material on which the circuit is drawn. How signals move through that?

  Are you talking about the printed circuit board?
• 

  shreyasm89

  @aj-No buddy...he is already aware of a PCB.In fact he expected to find a PCB inside but instead found a black polythylene-like material.
  @nenu-The small chip that you are mentioning is the microcontroller IC. Was that black material between the numeric keypad & the chip?
• 

  patsham

  you can show us the picture of that circuit so that we can help you.
• 

  nenuadwani

  shreyasm- you are ryt. I expected a pcb, infact i got a pcb based circuit also in other calculators. but the model i opened first didnt had a pcb. the whole circuit was on polythene just lyk it would have been on a pcb.
  i will try providing a picture of that circuit. no the ic is on the chip itself.
• 

  ITPROFESSIONAL

  these all are PLC's
• 

  Van Helsing

  I was aware that a PLC (programmable logic controller) was a computer inside application, not vice versa. 😕
  
  The "all plastic" inside with embedded IC's under polimeric black glue drops is the china-way of making things cheaper. A PCB is made of polymer/glass fiber board with copper wiring layers. The plastic PCB (Poly Carbonate) or other, with carbon wiring layer is a cheaper more flexible way of making PCB's. And thinner too. The cost of a microprocessor or a digital integrated circuit is mainly connections and body. For very large production scale is cheaper to mount IC's directly on the PCB alas protected by a glue drop.
  Obviusly, under the drop you'll find gold wires connections to carbo-something circuit threads to an fro keyboards and LCD display, and a chip wich holds a microprocessor usually 4 bit wide, a RAM a ROM and an I/O logic as usual in a microcomputer. The ROM holds the software for making the calculator ... calculating. 😒
  Cheers...
• 

  nenuadwani

  I am thankful to all for clearing my doubts. Now I am clear about what I actually saw inside that calculator.
  Thanks a lot crazy engineers.