Advice on Switches

anddan · 21st May 2006, 06:59 AM

Hello, first time posting in the forum.

I am designing a simple phantom power supply with a signal balanced xlr in and two outputs, a balanced xlr out and 1/4 " unbalanced out. A need a way of selecting the outputs. The first prototype used a 9v dpdt latching relay. These relays are quite pricey, (7$ each). It seems to me that the simplest thing would be a single mechanical dpdt switch that's panel mounted but browsing around I can seem to find any information on whether this is a good idea or what would be a good component to use. Another I've looked into is a semiconductor logic controlled switch, specifically the fairchild FSA2467. Anyone have experience with this stuff.

Andrew

testlab · 22nd May 2006, 05:23 PM

I guess your most important criterion is going to determine what you use for switching.

If price is most important, a regular old switch hard to beat. You may suffer some possible bandwidth limitations. Noise and intermittent operation may also come with age.

If more complexity and cost is not an issue, you can use JFET's. But now you have to come up with a drive scheme. Same with analog switches like the SSM2404. Most analog switches are meant for video not audio. The self noise of these devices may be a little high in this stage. Read the datasheets carefully.

anddan · 22nd May 2006, 06:33 PM

Ok, thanks for your advice. In the end it doesn't seem that a dpdt panel mount switch is any cheaper than a spdt switch and a relay. I'll use the relay to keep the signal paths short. For the sake of others who might want to do something similiar in the future I have choosen:

DF2-L2-DC6V relay digikey part no 255-1042-ND
and a rocker switch mom-on-mom digikey part no SW340-ND

to supply the 6V to the relay (my whole device is powered from the same 6V source).

I'm also wondering about connectors to go from the panel mount inputs and outputs to the board. I could just use posts I suppose but I thought since it is a early attempt at design it might be useful to be able to easily pull out the pcb from the box, and therefore think it would be useful to use connectors. Any suggestions for low noise connectors?

BobEllis · 22nd May 2006, 06:47 PM

Check out Apexjr.com for relays and switches.

http://www.apexjr.com/components.html

Aromat
DS2Y-S-DC12V
12Vdc DPDT Dip Package
$1.50

Just a happy customer.

poobah · 22nd May 2006, 07:01 PM

Is there any harm in leaving both outputs "always on" and avoid the switchgear altogether?

21st May 2006, 06:59 AM	#1
anddan diyAudio Member Join Date: May 2006	Advice on Switches Hello, first time posting in the forum. I am designing a simple phantom power supply with a signal balanced xlr in and two outputs, a balanced xlr out and 1/4 " unbalanced out. A need a way of selecting the outputs. The first prototype used a 9v dpdt latching relay. These relays are quite pricey, (7$ each). It seems to me that the simplest thing would be a single mechanical dpdt switch that's panel mounted but browsing around I can seem to find any information on whether this is a good idea or what would be a good component to use. Another I've looked into is a semiconductor logic controlled switch, specifically the fairchild FSA2467. Anyone have experience with this stuff. Andrew

22nd May 2006, 05:23 PM	#2
testlab diyAudio Member Join Date: Dec 2005 Location: Grand Rapids MI	I guess your most important criterion is going to determine what you use for switching. If price is most important, a regular old switch hard to beat. You may suffer some possible bandwidth limitations. Noise and intermittent operation may also come with age. If more complexity and cost is not an issue, you can use JFET's. But now you have to come up with a drive scheme. Same with analog switches like the SSM2404. Most analog switches are meant for video not audio. The self noise of these devices may be a little high in this stage. Read the datasheets carefully. __________________ It's not whether you win or lose, it's how you lay the blame.

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22nd May 2006, 06:33 PM	#3
anddan diyAudio Member Join Date: May 2006	Ok, thanks for your advice. In the end it doesn't seem that a dpdt panel mount switch is any cheaper than a spdt switch and a relay. I'll use the relay to keep the signal paths short. For the sake of others who might want to do something similiar in the future I have choosen: DF2-L2-DC6V relay digikey part no 255-1042-ND and a rocker switch mom-on-mom digikey part no SW340-ND to supply the 6V to the relay (my whole device is powered from the same 6V source). I'm also wondering about connectors to go from the panel mount inputs and outputs to the board. I could just use posts I suppose but I thought since it is a early attempt at design it might be useful to be able to easily pull out the pcb from the box, and therefore think it would be useful to use connectors. Any suggestions for low noise connectors?

22nd May 2006, 06:47 PM	#4
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	Check out Apexjr.com for relays and switches. http://www.apexjr.com/components.html Aromat DS2Y-S-DC12V 12Vdc DPDT Dip Package $1.50 Just a happy customer.

22nd May 2006, 07:01 PM	#5
poobah diyAudio Member Join Date: Nov 2005	Is there any harm in leaving both outputs "always on" and avoid the switchgear altogether?

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