Hi - I’m looking to increase the volume of the triangle wave coming out of the 3340.
In this post, a simple x2 amplifier is suggested for the triangle wave.
I was wondering if I could simply modify the triangle wave’s buffer on the oscillator I built (image attached) by removing the link between the inverting input and the output, replacing it with a 10k resistor, and running another 10k resistor to ground, as suggested in the post above? Is there any reason why this wouldn’t work, or anything I need to be careful of etc.?
Thanks everyone! As I’ve already built three of these, I’ll try just adding in the two 10k resistors as Thijssjiht suggests. I will have a look at the other options for future builds though!
My triangle out undershoots at low frequencies, maybe at high frequencies as well, I haven’t tested it enough. Point is, it can (not will necessarily) be a little bit dangerous to do no DC offset manually like this. A filter cap will also DC offset, will account for offset drifts, and will protect against under and overshoots.
As far as I understand it. I have but a small fraction of your experience, so please correct me if I’m wrong or missing something here.
Not sure what you mean by over- and undershoots. In my VCO the 3340 tri output is reliably 0 to 4 V, I have observed no “offset drift”. A capacitor can remove a DC offset even if it varies but can also distort a waveform (especially square/pulse) and there’s still the amplitude difference between waveforms to deal with. I prefer dealing with both problems with an op amp output stage.
