Super Simple Sine Wave genorator

Projects General Guidance
1

Hey Guys

Im currently in year 10 and I'm doing the only electronics class at school and Ive being asked to make a Sine wave generator with a couple of racks of parts (things that you would find at a Jaycar, radio shack, tandy etc (depending were you guys are from)). My teacher wants me to display the waveform on a 20MHZ oscilloscope so I can't do any high frequencies. Preferably running of a 6v supply and don't know how more advanced this will make it the sine wave goes to a negative voltage.

Does anyone have any simple schematics for this project.

2

You could google "R-2R DAC" or "resistor ladder DAC" and see if that meets your requirements.

3

ianscott-arduino:
racks of parts (things that you would find at a Jaycar, radio shack, tandy etc

What sorts of parts?

It's probably easier to generate a sinewave without an Arduino than with one.

...R

4

Google 'sine wave with arduino'
About 145,000 results

5

ianscott-arduino:
Ive being asked to make a Sine wave generator with a couple of racks of parts (things that you would find at a Jaycar)

Kinda like this only it needs 12V?

Does anyone have any simple schematics for this project.

Such as figure 12?

6

Hi, sounds like you just need a simple audio sinewave oscillator.
There are some simple circuits around, google. simple audio sinewave oscillator circuits

Look at the phase shift oscillator that outputs 250Hz, its simple, uses available components, will run off a 9V battery.

To get the output to go negative you will need to decouple the DC part of it, so just put a 0.47uF capacitor between the output and the oscilloscope input.

Check with your teacher to see if it will do the job.

Tom...... :slight_smile:

7

If it's purely a sinewave, do you require it drop below 0v eg 5v to -5v or just 0v to 5v?

520×600 10.1 KB

8

@cjdelphi
Nice

9

steinie44:
@cjdelphi
Nice

Maybe - but nothing resembling a sinewave.

{It is actually a distorted triangle wave. Whatever that website is - it is simply wrong. Unfortunately, that does happen with random websites.}

10

It's MY opinion, not yours.
I have about had it with all the negative comments people make.
Why not say; Maybe, but there are better ways to do it.

11

I actually built the sine wave circuit and then fed it an underpowered 3watt led..

But even so after probing it with a cheap oscilloscope, the sinewave from a 555 looks like a sinewave over a triangle or square wave...

The cal slowly charges and discharges, the opamp detects 1/3 the voltage but it's slowly charging a cap, how's this modified sinewave take place?