mvs sarma
Well-Known Member
cucamunga said:sorry, Electronic Civil Engineering --- i don't know the international name of my career...maybe you can omit the civil in between.
i first built it on a permanent board... but i omit the diodes (worked only for program but not for erase...can someone explain that to me ??!!)... and know i build it on a project board.
i checked all connections, all OK... the voltage at the output of the 7805 is 6,3.
no idea why... i tried a lot... and all the same thing...
No way. You can't get 6.5 out of a 5V regulator unless you would have wired 2 diodes in the common path. or accidentally used 7905 instead of 7805and wired it as per 7805 connections.... etc. Ofcourse the chip could have gone faulty.
Now please indicate
1. Did you wire 7812 with 2 diodes in the common lead.
2. Is the 7812 the first IC facing the INPUT power supply?
3. what is the INPUT power voltage as measured by you.
4. voltage at the output of 7812( this is the same as the input to 7805)
5. what is the measured voltage at the output of 7805.
if you can put a photograph of the schematic ( not the company version)what you have wired, it might help.
Last edited: