I've the following circuit for generating sine wave.
As I'm supposed to make sine wave within 1 kHZ – 200 kHz, I chose wein bridge oscillator circuit. However, I'm not able to increase the frequency, even though I calculated it with the following formula: \$f = 1/2\pi RC\$. At the moment with current parameters, got 13 Khz frequency not any more, tried a lot with different parameters but couldn't get above that. Can you please, help or suggest different circuit where, could get the needed frequency? I have to make the sine wave generating oscillator using operation amplifier or transistors. Highly, appreciate if you could assist me!
Best Answer
The slew rate of a 741 (0.5V/us typical) is inadequate for high frequencies. A +/-10V sine wave output at 200kHz requires a slew rate about 25x higher than a 741 is capable of.
Try a JFET op-amp such as a TL081 or LF351.