Previous in Forum: Notebook connect to Ac adapter   Next in Forum: Wirless Transmission of a 4-20mA Signal
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
2 comments
Rate Comments: Nested
Anonymous Poster

FM modulator

12/30/2008 4:07 AM

I'm designing FM transmitter .In the modulator part I'm using a VCO (voltage controlled oscillator) NE566 which outputs a square & triangular wave output. But I need a sine wave in the out put. I have searched for DIP VCO with sine wave out put but couldn't find one. How can I change the square wave or the triangular wave to sine wave?....Is there VCO IC with DIP packaging with sine wave output at frequency not more than 20MHz??
Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
Electroman
Guru
United Kingdom - Member - Olde Member!! Engineering Fields - Instrumentation Engineering - New Member

Join Date: Jul 2006
Location: Dunstable, England
Posts: 2821
Good Answers: 45
#1

Re: FM modulator

12/30/2008 8:52 AM

Squash the square / triangle wave through a bandpass filter or just a low pass filter to remove the harmonics = a sine wave.

__________________
 A little knowledge is a dangerous thing - Googling is far worse!
Reply
QuasiGlob
Participant

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

Re: FM modulator

12/30/2008 8:28 PM

Are you developing an FM Modulator with a chip like you describe?

Do you think is the better option? ...instead of another oscilator. I know few integrated chips that could be easy for you, or another simple circuits with one transistor. If you feel, I can provide you the schematics or the information.

__________________
 "Solo quiero saber el pensamiento de Dios..." Albert Einstein.
Reply
Reply to Forum Thread
Have a Different Question?
2 comments

Previous in Forum: Notebook connect to Ac adapter   Next in Forum: Wirless Transmission of a 4-20mA Signal
You might be interested in: Rotary Coded DIP Switches, DIP Switches

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Communications & Electronics:
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 (71 right now)
Show Members
Advertisement