Previous in Forum: Design Profile- Recent trends in EE?   Next in Forum: Using a Switch at Different Voltages
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
4 comments
Rate Comments: Nested
shaik.thameem
Associate

Join Date: Dec 2008
Posts: 33

About ADC0804

03/26/2011 6:01 AM

Dear sir, I tested analog to digital converter ADC 0804 (IC) by giving input from Vcc of that same IC in free running mode(Test Mode) then i got digital output, after that i given input directly from bridge rectifier( by varying from 0 to 5V) then it is not giving output. why it is so,how to solve this problem?please tell me and help me. thanking you sir
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
rakesh_semwal
Guru
India - Member - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Oct 2006
Location: India, 200 Km. North of Delhi.
Posts: 1393
Good Answers: 53
#1

Re: about ADC0804

03/26/2011 6:17 AM

Is that bridge rectifier making an independent supply? if that is the case have you wired ground of rectifier with circuit ground? And what are the values of voltages on on ref pins?
Register to Reply
shaik.thameem
Associate

Join Date: Dec 2008
Posts: 33
#2
In reply to #1

Re: about ADC0804

03/26/2011 7:52 AM

yes, rectifier is independent of supply,but its grounded,vref(pin 9 not connected to get max supply), Vcc-5V and right i know connected 4.7v zener diode at Vin(pin 6) but it was burnt.please help me thanking you sir.
Register to Reply
rakesh_semwal
Guru
India - Member - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Oct 2006
Location: India, 200 Km. North of Delhi.
Posts: 1393
Good Answers: 53
#3
In reply to #2

Re: about ADC0804

03/26/2011 10:48 AM

Difficult with info provided But You can read this,
Register to Reply
Electronic Wiz
Power-User

Join Date: Dec 2008
Location: Western Colorado, USA
Posts: 202
Good Answers: 16
#4

Re: About ADC0804

03/26/2011 10:52 PM

It would appear that you have overloaded the ADC's input. It operates off of 5 volts DC, you mentioned that you had a 4.7 volt zener on the input pin which was 'burnt'. The problem is that you applied 5 volts AC which has a peak voltage of 5*1.414 or 7.071 volts to the input, when the zener blew, so did your ADC's input. Check the specifications as to how high the input voltage can be. To be on the safe side, I would use a variable 0-5 VDC source for testing.
Register to Reply
Register to Reply
Have a Different Question?
4 comments
Copy to Clipboard

Users who posted comments:

Electronic Wiz (1); rakesh_semwal (2); shaik.thameem (1)

Previous in Forum: Design Profile- Recent trends in EE?   Next in Forum: Using a Switch at Different Voltages
You might be interested in: IC Waveform Generators, IC Modems, IC Timers

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Electrical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (93 right now)
Show Members
Advertisement