| Electronics > Beginners |
| DIY Function Generator |
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| 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? |
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