i need change 5v to 12v that it use to supply a device; for this use MC34063A step up voltage converter; this site can calculate the parameter.

i have problem all thinks is OK but i have same voltage at output!

how to find my mistake ?

MC34063A step up

MC34063A step up2


Pin 2 is not grounded so it does not work.

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    \$\begingroup\$ ok, Thank you, i check it , now worked. \$\endgroup\$ – Mahdi KhosroAnjom Aug 29 '19 at 9:40

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