Hi, I'm building a function generator using op amps. I'm following the attached schematic diagram. However, the frequency range is very small (307 -389Hz). Any ideas on how to increase it? Maybe up to 1kHz, if possible. Thanks.

 

To get 3 times the frequency, reduce C1 to one third (0.33 uf). The amplitude of the signals at the output will be 1/3 the amplitude at 3xx Hz unless you also reduce the the three integrator capacitors by the same factor (1/3).

 

Thanks DickCappels!