SKRM-C8-R02: Oscillation at 280Hz
Posted: Mon Jun 22, 2015 11:09 am
Dear Frank:
After having integrated the R02 module into my listening room reverb system, I noticed an oscillation of 280Hz at the outputs of the module, as well as after the buffer amplifiers, when no input signal was fed to he module. The settings were: Prg:"Hall", Pot0: min, Pot1: 35%, Pot2: 20%.
When fed to an audio spectrum analyzer, the level measured to approx. -85dBV. Although this appears to be rather low, it's nevertheless clearly audible when no input signal is present. The input pins (L and R connected) are essentially clean. Other programs also show an oscillation, although at different frequencies.
Strangely enough the self-oscillation disappears when an input signal >-75dB is fed to the module.
Have you noticed anything similar before?
Besides this minor flaw, which could originate in my circuit as well, it's a great module with unparalled versatility.
Best regards
Frank
After having integrated the R02 module into my listening room reverb system, I noticed an oscillation of 280Hz at the outputs of the module, as well as after the buffer amplifiers, when no input signal was fed to he module. The settings were: Prg:"Hall", Pot0: min, Pot1: 35%, Pot2: 20%.
When fed to an audio spectrum analyzer, the level measured to approx. -85dBV. Although this appears to be rather low, it's nevertheless clearly audible when no input signal is present. The input pins (L and R connected) are essentially clean. Other programs also show an oscillation, although at different frequencies.
Strangely enough the self-oscillation disappears when an input signal >-75dB is fed to the module.
Have you noticed anything similar before?
Besides this minor flaw, which could originate in my circuit as well, it's a great module with unparalled versatility.
Best regards
Frank