# Need a simple potentiometer controlled variable frequency sine wave oscillator

#### ExtensionShoe

Joined Mar 22, 2020
3
Hey everyone for a university project i need to generate 2 sine waves:
1KHz-10KHz
20KHz-30KHz
I want to use a joystick which has 2 potentiometers to control the 2 sine wave generators' frequency.
I looked online and Wien bridge oscillator is everywhere but since it requires 2 resistors values to be adjusted at the same time i cant use it?

Is there a way for me to generate a sine wave wih the aforementioned frequencies

Thank you

#### Wolframore

Joined Jan 21, 2019
1,743
Wien bridge is a beautiful sine wave generator... and you can do it but need a ganged potentiometer.

please attempt to do your homework before asking us to do it for you. There are a number of solutions and you get more out of it by researching and trying to solve it.

also this should be posted in Homework section

#### MrAl

Joined Jun 17, 2014
7,511
Hey everyone for a university project i need to generate 2 sine waves:
1KHz-10KHz
20KHz-30KHz
I want to use a joystick which has 2 potentiometers to control the 2 sine wave generators' frequency.
I looked online and Wien bridge oscillator is everywhere but since it requires 2 resistors values to be adjusted at the same time i cant use it?

Is there a way for me to generate a sine wave wih the aforementioned frequencies

Thank you
Did you look into using digital potentiometers?

#### LvW

Joined Jun 13, 2013
980
Most harmonic oscillators are not single-tunable.
This is because we - of course - require that during tuning of the frequency the oscillation condition must not be disturbed or even destroyed.
However, there are some oscillator circuits that are tunable in frequency using one resistor only...but in most cases TWO opamps are necessary for each oscillator . Would this be a problem for you? There are some SRCO (single-resistor-controlled oscillators) based on one opamp only - however, they are not easy to design and the tuning range is more restricted if compared with two-opamp circuits.

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#### ExtensionShoe

Joined Mar 22, 2020
3
Most harmonic oscillators are not single-tunable.
This is because we - of course - require that during tuning of the frequency the oscillation condition must not be disturbed or even destroyed.
However, there are some oscillator circuits that are tunable in frequency using one resistor only...but in most cases (in all cases ?) TWO opamps are necessary for each oscillator . Would this be a problem for you?
no of course not can you give some examples

#### ExtensionShoe

Joined Mar 22, 2020
3
Did you look into using digital potentiometers?
I am not allowed to use microcontrollers unfortunetaly

#### Wolframore

Joined Jan 21, 2019
1,743
moderators please move this to HOMEWORK

#### MrAl

Joined Jun 17, 2014
7,511
I am not allowed to use microcontrollers unfortunetaly
You dont need that with all digital pots.