I am pretty new to EE. I'm trying to make an oscillator similar to this one:
I've got a pot in place of R1 to adjust the frequency of the circuit, and all of this is on a breadboard.
I've got a cheap multimeter with a frequency mode. It detects a sane, measurable frequency on the square wave output (albeit ~477Hz instead of the calculated/expected 1527Hz), but nothing on the triangle output.
When I insert a small piezo speaker between ground and the outputs, I hear nothing -- unless I also use the freq meter at the same time, in which case I do hear an audible tone at a frequency controlled by the pot, which fades out in about 1/2 sec when the probes are removed. Again this only works on the square wave side, not the triangle side.
In voltmeter mode, I see ~2.4V on the square out and ~1.4V on the triangle from a very tired 9V battery giving 5.1V. I got similar results driving the circuit from the 5V line of an Arduino.
I see there are caveats about the voltage divider circuit I'm using, but I don't fully understand them.
Is it feasible to make simple op-amp oscillators like this on a ~5V supply?
Is the voltage divider inadequate for producing audible output, or do I need a separate amplifier circuit, or is there some other problem?