a.palfreyman
pfm Member
Bought a mega-cheap TA2020 amp from ebay to add to some old Wharfedale Diamonds for TV duties. Had to correct some errors due to (amongst other things) the input caps (10uF electrolytics, replaced with 2µ2 films) and the charge-pump cap (1uF electrolytic) being the wrong orientation as well as the speaker terminals being marked wrong so that the outputs would be out of phase. Having 'scoped the outputs, with about 0.6Vp-p on input and the volume pot adjusted to give about 4Vp-p on the outputs, the output waveform is a sine-wave but with about 1V of HF "splatter" on it. Have checked the output filtering which is now to the tripath application spec after changing some 0.1uF for 0.22uF (3 per channel). Just wanted confirmation that despite the output filtering, this HF "noise" is normal.
Cheers,
AP
Cheers,
AP