autooscilating oscillator

Using Arduino General Electronics
#1

I'm not sure if name is right but I'll try to write main idea of the device I want to make.

In my lab I have signal generator, which has such function. For example I can vary oscillator frequency from 100 to 800 khz in 1ms. And it works great.

I would like to make such generator, which will operate like described. My main point is that this device has to be compact and if it would be microcontroller based, I think that's would be great. And I thing max frequency to be less than 1 mhz.

Have you any suggestions ? Thanks in advance.

#2

You can use the arduino to drive a DDS chip. By varying the clock speed of the chip, you can change the frequency of the output signal.

#3

For instance one of the many Analog Devices DDS's like the AD9834 that output
sine and triangular waves from DC upto 20MHz under SPI control.

However its a surface-mount chip and needs signal-conditioning circuitry on the output
to convert current-mode DAC outputs to a voltage signal.

#4

I’m not sure if name is right

It is not.
What you want is called a sweep frequency oscillator.

#5

thank you very much i've purchased AD9850 and i'll try it out.

#6