# Wave Genarators

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#### budginut

##### New Member
Hey all those in the know

I looking at doing some fun experiments and am looking for a wave generator that will to a variety of wave forms (sine,square,sawtooth etc.) i need to be able to vary the frequency of the the waves with fine adjustments eg. not stepped 20 kHz, 40kHz and so on. also I'd like it to produce frequencies from say 100hz up to saw 1Ghz.

So that's the easy part the hard part is I need variable voltage and amperage control. I need to vary both feeding into my experiments and that's where I getting stuck when I try to find what I need.

Please if there is anyone out there that can at least point me in the right direction please do so.

Cheers

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#### transistance

##### New Member
Simple Multi-Function Generator

By changing the last stage -2X amp to amplifier of your choice you can vary the output voltage.

I'm not sure how to vary the current output though, other than by changing the generated frequency.

Check out the Java Circuit Simulator @ www.falstad.com/circuit/. For example, to see how to create a sawtooth waveform go to Circuits>Opamps>Oscillators>Sawtooth Wave Generators. You can also use Sawtooth Wave Generators to produce duty-cycle controlled square wave outputs. You can vary the component parts or replace resistors with potentiometers on this simulator and observe the effects before you build your circuit.

Good luck, you're going to have a pretty hard time soldering all this together if you want all those properties to work on one board. Make sure to have a negative power supply feeding your opamps (-) supply.

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##### Banned
100hz to 1ghz? Not asking for much are you? Even professional function generators don't usually go up to 1ghz, you might wanna set your sites a little lower. You can easily do audio frequencies, 20-20khz. Just use an audio amplifier, you can use audio software to create any arbitrary waveform you want and the volume control is amplitude. What exactly are you trying to do where you need 1ghz?

#### audioguru

##### Well-Known Member
I guess it is another HHO scam.

#### budginut

##### New Member
I need it to conduct a series of experiments on electrolysis.

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##### Banned
If you want 100hz to 1ghz, you're stuck paying the money, there is no 'cheap' way to do what you're asking.

#### iceprincess

##### New Member
Hey...I am also looking for a circuit to help me generate sine, square, triangular wave forms...
I am kinda new to all this and a little lost...help please!!!!!!!!!!!!!!!!!

#### audioguru

##### Well-Known Member
Hey...I am also looking for a circuit to help me generate sine, square, triangular wave forms...
I am kinda new to all this and a little lost...help please!!!!!!!!!!!!!!!!!
Since you are new and since you are lost then buy a function generator kit that uses the XR2206 IC.

##### Banned
A PC sound card pretty well as a function generator for audio frequencies, which is useful for many things.

#### Tesla23

##### Member
Generating such a range is getting more feasible, scrap the function generator chips, go DDS. The AD9912 DDS with a 1GHz clock can directly generate 4uHz to 400MHz. Output over frequency is almost dead flat with a few dB of rolloff at the high end.

Can't see a problem getting a few dBm, providing amperage over this frequency range is going to be a challenge though..

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