ardi100 Posted May 17 Share Posted May 17 I had my first rehearsal with a new band tonight. While setting up, the keyboards got plugged into the PA and immediately I could hear a thick ticking sound coming from my amp. I eventually isolated it to the power supply for my Boss GT1-B. It was a super cheap one. I've never had anything like this before. Is it new power supply time? Or was that a freak occurrence? Quote Link to comment Share on other sites More sharing options...
itu Posted May 18 Share Posted May 18 Give us more data, i.e. a pic of the PSU plate, or type. Quote Link to comment Share on other sites More sharing options...
ardi100 Posted May 18 Author Share Posted May 18 Thanks! Is this what you mean? Quote Link to comment Share on other sites More sharing options...
itu Posted May 18 Share Posted May 18 GT-1B requires 200 mA. Therefore your PSU can push enough energy to the effect (500 mA). It may be so that the quality of the PSU is not very good - I would try another one with reasonable specs, of course (9 VDC, >300 mA). The output of an SPS can "leak" some ripple from the power line, or is just filtered weakly, and that makes the whole system tick. Quote Link to comment Share on other sites More sharing options...
ardi100 Posted May 18 Author Share Posted May 18 Thanks, I was thinking it might be just the general quality. Why it happens when the keyboard plugged into the PA baffles me - but then I know nothing about power! Quote Link to comment Share on other sites More sharing options...
Mottlefeeder Posted May 18 Share Posted May 18 Modern switching power supplies switch at high frequencies to avoid causing problems in the audio band. If the keyboard psu and yours are connected via the mixer, what you may be hearing is some form of beat note from the two psu's differing frequencies. Changing one of the PSU's may cure it. David 1 Quote Link to comment Share on other sites More sharing options...
ardi100 Posted May 20 Author Share Posted May 20 On 18/05/2024 at 22:17, Mottlefeeder said: Modern switching power supplies switch at high frequencies to avoid causing problems in the audio band. If the keyboard psu and yours are connected via the mixer, what you may be hearing is some form of beat note from the two psu's differing frequencies. Changing one of the PSU's may cure it. David I wasn't through the desk, though, only the keyboard was. Quote Link to comment Share on other sites More sharing options...
Mottlefeeder Posted May 20 Share Posted May 20 7 hours ago, ardi100 said: I wasn't through the desk, though, only the keyboard was. Oops You said that and I missed it. David Quote Link to comment Share on other sites More sharing options...
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