it's not expensive and can save the main electronic life in case of power supply failure) I've replaced the regulator and added a 3.3V transil diode as protection. I've used the Nichicon CD serie 105☌ - 2000Hrs (the 5000Hrs were not available in low ESR/high ripple and same size) To completely solve the problem I've chosen to totally recap the unit. Replacing the regulator has solved the problem because the new one is stable with a lower bypass capacitance.
It was fine under my multimeter but bad under the LCR meter! Replacing the regulator has solved the problemīut the ripple measured was strangely high so I've removed the 47uF cap at the output of the regulator and measured it. The output noise must be near 55µV and rejection ratio at least 64db with line regulation near 15mV and load regulation 25mV. The current drawn from the regulator is measured at 350mA maxĪt the beginning I was thinkibg about a faulty LDO regulator and I have searched for a new one with the closest specs Where the scope is connected with short ground link (ripple noise method)Īnd now with the cap connected with the same scale as before It sound like a clock sync problem so I've checked the master clock, PLL and all was fine.Īfter checking the power supply of the DSP something was strange. Some search on the internet confirm a sound issue known as "static noise" I have recently bought an XV-5080 on ebay.Īfter some tests I noticed some crackling noises in the sound.