It is using common parts except the PIC: US1........................................PIC12C508R R3,R9,R16,R17,R24..................1kW
US2................................................NE5534 R4,R5.......................................10kW
US3................................................CD4051 R8,R14,R15,R20......................1MW
US4..................................................LM358 R10,R22,R23...........................22kW
US6..................................................CNY17 R11..........................................270W
US7................................................ICL7660 R12,R13..................................3,3kW US8...................................................78L05
US9..................................................NE555 R21.........................................2,2kW
T1.....................................................BD912 R25............................................33W
T2.....................................................BC547 R26..........................................330W
T3.....................................................BC557
and the hex for PIC12C508R is not available....
I think that other PIC12F has similiar pinouts...
Do you guys think it would be doable to replace this PIC with newer chip and write a new firmware in C? What is that firmware doing in that metal detector? What would it be supposed to do? What's the function of PIC12C508R in schematic above?
Thanks in advance!
You don't know what the firmware is supposed to do, and then you ask how difficult it would be to write it? I would say very difficult. It sounds like you're asking somebody, besides yourself, to analyze the circuit, determine how it operates, design an algorithm, and then write the code. How much money are you offering?