Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Voltage controlled variable frequency audio oscillator schematic needed

Status
Not open for further replies.
neazoi

neazoi

Advanced Member level 6
Joined
Jan 5, 2008
Messages
4,122
Helped
13
Reputation
26
Reaction score
15
Trophy points
1,318
Location
Greece
Activity points
36,951
Hi I need a variable frequency audio oscillator circuit that operates from 480Hz to 2700Hz. I do not care if it is square wave or sinewave (squarewave better).
What I do care is that the frequency can be varied with voltage and the output is around 50% duty cycle (not precisely critical).

I want to avoid any proprietary ICs. Discrete components or common ICs like the 555 are fine.

Can you please suggest me such a circuit?
Thank you
 
Last edited:


    neazoi

    neazoi

    Points: 2
    Helpful Answer Positive Rating

How to Build a Voltage Controlled Oscillator (VCO) with a 555 Timer Chip

In this project, we will show how to build a voltage controlled oscillator (VCO) with a 555 timer chip.
www.learningaboutelectronics.com

Much better linearity -


If you want 50% Duty Cycle on either of these use tiny gate logic D or T flip flop
to yield 50%.



Regards, Dana.
 

    neazoi

    neazoi

    Points: 2
    Helpful Answer Positive Rating
The lm331 seems an excellent choice and it is cheap and readily available and in DIP.
Thanks a lot!
 

XR2206 & 2208 are 2 chips that would do this well if you are prepared to move away from a more discrete design
 

This VCO circuit is in the datasheet of the LM358 dual opamp:
 

Attachments

  • LM358 VCO.png
    LM358 VCO.png
    28.6 KB · Views: 194

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top