Selector Switch Pop - Newbie Question

LHMAudio · 18th May 2009, 09:56 PM

I have searched the forum, but cannot find an answer to my problem.

I wired up a three way Goldpoint stereo selector switch to select the source for my power amp. The switch is break before make and I am switching both the signal and ground wires.

My problem is I get a loud pop when I switch from one source to another. I'm sure if I tied the grounds together that would solve my problem, but I have read that switching both the signal and ground is the proper way to do a selector switch.

Any help is greatly appreciated.

Lindsay

Trebla · 18th May 2009, 10:07 PM

I think it's more usual to have a "make before break" type for this application. Someone correct me if i'm wrong.

LHMAudio · 18th May 2009, 10:13 PM

The Goldpoint distributor insisted that a selector switch should be break before make. I had asked for make before break and they do not have that type of selector switch.

Wavebourn · 18th May 2009, 10:17 PM

If it pops you have some DC on it. Shunt it's output to ground by a resistor, it should help. And be sure your signal sources has no DC on outputs. Also, I would not switch ground wires.

LHMAudio · 18th May 2009, 10:49 PM

Thanks Wavebourn. What value resistor should I use for the shunt to ground?

I've appreciated reading your posts on the John Curl Thread.

Lindsay

Wavebourn · 18th May 2009, 11:31 PM

Quote:

Originally posted by LHMAudio
Thanks Wavebourn. What value resistor should I use for the shunt to ground?

I've appreciated reading your posts on the John Curl Thread.

Thanks!

As soon as the majority of modern equipment have around 100K inputs I assume 470K will add inaudible losses.

18th May 2009, 09:56 PM	#1
LHMAudio diyAudio Member Join Date: Sep 2005	Selector Switch Pop - Newbie Question I have searched the forum, but cannot find an answer to my problem. I wired up a three way Goldpoint stereo selector switch to select the source for my power amp. The switch is break before make and I am switching both the signal and ground wires. My problem is I get a loud pop when I switch from one source to another. I'm sure if I tied the grounds together that would solve my problem, but I have read that switching both the signal and ground is the proper way to do a selector switch. Any help is greatly appreciated. Lindsay

18th May 2009, 10:17 PM	#4
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	If it pops you have some DC on it. Shunt it's output to ground by a resistor, it should help. And be sure your signal sources has no DC on outputs. Also, I would not switch ground wires. __________________ If I disappear suddenly, that means I finally created a time machine and pushed wrong button that brought me to Stalin's Russia. In any experiment any result is the result. Even if it is negative.

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18th May 2009, 10:07 PM	#2
Trebla diyAudio Member Join Date: Nov 2005 Location: North West	I think it's more usual to have a "make before break" type for this application. Someone correct me if i'm wrong.

18th May 2009, 10:13 PM	#3
LHMAudio diyAudio Member Join Date: Sep 2005	The Goldpoint distributor insisted that a selector switch should be break before make. I had asked for make before break and they do not have that type of selector switch.

18th May 2009, 10:49 PM	#5
LHMAudio diyAudio Member Join Date: Sep 2005	Thanks Wavebourn. What value resistor should I use for the shunt to ground? I've appreciated reading your posts on the John Curl Thread. Lindsay