Bottlehead Forum

Bottlehead Kits => Legacy Kit Products => Quickie => Topic started by: underdawg on March 10, 2013, 06:53:28 AM

Title: quickie pop or loud thump switching sources
Post by: underdawg on March 10, 2013, 06:53:28 AM

The last issue I have with the quickie is a loud pop or thump, however you want to call it, when switching sources on the selector switch, any ideas?
Thank you in advance for everyones insite.

Title: Re: quickie pop or loud thump switching sources
Post by: ssssly on March 12, 2013, 05:50:30 AM

Someone please correct me if I am wrong. But when using the switch to go between sources, in the split second it takes to go from one to the other, the switch is an open circuit and will almost always give you the thump when it reconnects.

Title: Re: quickie pop or loud thump switching sources
Post by: galyons on March 12, 2013, 05:58:14 AM

Quote from: ssssly on March 12, 2013, 05:50:30 AM

Someone please correct me if I am wrong. But when using the switch to go between sources, in the split second it takes to go from one to the other, the switch is an open circuit and will almost always give you the thump when it reconnects.

There are 2 major switch topologies, break-before-make, (aka Non-shorting), and make-before-break, (aka Shorting).  The BBM can have noise on switching as the circuit goes open between switch positions.  MBM avoids this possibility by having a wiper that contacts the next contact before breaking contact with the previous.

Cheers,
Geary

Title: Re: quickie pop or loud thump switching sources
Post by: earwaxxer on March 12, 2013, 08:36:41 AM

I would always switch my power amp off.