Electronics > Beginners
DIY Function Generator
<< < (6/14) > >>
T4P:
Improve high frequency filtering.
poptones:
On the above circuit? It's a 6 pole filter and you can change the cutoff frequency. 1st harmonic is going to be some 25db down, by the time you get to 8th it's just noise.
ptricks:
If you haven't seen it, microchip have a new pic that could greatly reduce the parts needed for a function generator, all you would need is a quality DAC.
The pic16f1508 has a numerically controlled oscillator , perfect for generating precise waveforms, configurable logic so you can make your own hardware gates for combining waveforms or triggering, and a complimentary waveform generator.

http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en553471
poptones:
It has a built in DAC but it is only 5 bits. It would be alright for RF but would suck as an audio gen unless you paired it up with something like the above switched cap 6 pole programmable filter.

The two together might make a good combo, but only for sines. If you try to generate a 1KHz square but you're filtering from 1KHz it's not going to be much of a square wave.

I could not find anything about getting the NCO accumulator signals off the chip via serial.
ziplock9000:
Any updates to this 5 years later? Are there better modules these days as I've outgrown my extremely basic generator?
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod