+5V and -5V OUT PSU Problem !!!!

[xsumirx]

Hello,

Actually I am designing a Digital Voltmeter using ICL7107. Having capability to measure 0-200v with 0.1 resolution.

My Problem is, when I connect the output of 7805 and 7905 to ICL7107 at Pin 1 and 26
respectively. the output voltage become zero  at the out pin of 7905 as well as 7805.

and not even a single 7-seg Display showing any output

Please help me  !!!!  :'(

I am not able to Judge weather its the Problem with my PSU or ICL7107.

I have attached my PSU ......  ??? ???

View attachment 41705

 

[Hero999]

How are we supposed to help without a schematic?

I did a quick Google for the typical configuration for the said IC and assuming you're using the standard set-up I don't know why you're surprised, you're short circuiting the power supply.

 

[xsumirx]

you're short circuiting the power supply.

If I have done any Mistake with my Power Supply.. Then can you Please Figure it out !!!!  ??? ???

and I have also attested the Schematics of the Digital voltmeter
??? ??? ???
View attachment 41706

 

[Hero999]

All right, you're not trying to do what I thought which was measuring its own power supply.

The first thing which could be wrong is the 7660 isn't needed, as you already have a negative supply, so it needs removing.

Secondly, what's the transformer's voltage rating? The filter capacitor values appear to be too small.

And Finally, have you made all the 0V connections?