I'm looking over the datasheets for the LM339 and LM324 chips and was wondering about their Voltage Controlled Oscillator circuits. http://www.national.com/ds/LM/LM324.pdf pg. 13 http://www.national.com/ds/LM/LM339.pdf pg. 13 First off, I heard that the LM339 is faster than the LM324, from a previous thread I posted, but that was for a different circuit. Would the speed difference be the same in this case? I am looking to generate 60Hz->10KHz square and triangle waves. On both datasheets, there is a marker for V+/2. Am I correct in assuming this is the voltage input going through a voltage divider with R1 = R2? The LM339 mentions that V+ = 30V. Does this mean I can only drive it with 30 Volts? I am looking to make this powered by a 9V battery; which parts would I have to change in order for it to work with a lower voltage? On the LM324 datasheet, it mentions that the wide voltage range is 0Vdc<=Vc<=2. I understand that bit, but what does the second part mean (V+ -1.5DC)?