From Oakley Sound via analogue Sent Sat, Oct 26th 2019, 13:21
From Oakley Sound via analogue Sent Sat, Oct 26th 2019, 13:21
In 60 Hz countries, a full-wave linear power supply will charge the power supply caps at 120 Hz rate, or every 8.3 mSec. At 50 Hz, the caps are charged slower, every 10 mSec or so (100 Hz). So when operating at 50 Hz, they have an additional 1.7 mSec to discharge due to the current drawn by the synth. If the supply was designed to operate at 60 Hz, and does not have enough margin in the design, running it at 50 Hz can cause the capacitors to discharge enough that the voltage regulators don't have enough input voltage to regulate their outputs. (This is called "dropping out"). When this happens, you will get 100 Hz ripple (sawtooth) on the output of the voltage regulator, which can feed into the audio and cause buzzing. I can't say if the Prophet 5 has this problem, but I would doubt it. Bob Grieb -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus