Hi,
I'm in the process of designing/breadboarding a signal generator with the XR-2206 Function generator chip. The data-sheet is on this link: **broken link removed**
Eventually, I plan to interface it with a micro-controller to provide a LCD display, frequency counter function and misc. other functions, but that's a little ways down the road...
The frequency of the EX-2206 is determined from the RC time constant.
The ideal frequency range would be 'full range' .01 Hz to 1 MHZ, or at least close to full range. I initially plan to use 4 timing caps (.001:mu:F to 1:mu:F), which will be selected in any combination by a 4 pin DIP switch. The timing resistor will be a 1 Meg pot, in series with a 10k-100K pot for fine adjustment. All RC values are preliminary and may be changed for optimal output.
Most of my frequeny projects are in the audio range, but a few of them are at higher frequencies.
My main questions are:
1. I'm considering an option that will allow selection between audio and linear taper pots for the timing resistors. Would this be a worthwhile option, and if so, how much difference is there between an Audio and linear taper pot? I don't have any audio pots laying around, so I can't really swap one with a linear to see what the difference might be.
2. Has anyone else built a function generator with the XR-2206 (or similar) chip, and do you have any advice or recomendations on this project?
Thanks in advanced!