Relay question - advice needed!! - Page 2

GRollins · 10th January 2005, 01:33 AM

DC pops are no problem. Locate the source of the DC and either service the piece or use a DC blocking cap. Either way, the problem will be solved.
The move-from-speaker-to-speaker thing is not a problem either. Relays will work just fine, or you can handle it in the electronics. For what you are describing, I'd probably say to avoid relays--not because they don't work, but because you'll be switching thousands of times per day. Look at the number of cycles a relay can handle, then run the math. You'll start experiencing reliability problems in a few months and it will be a perpetual maintenance headache from then on.
The fade down/up on the volume can be handled either analog or digitally, but will be easier digitally as I believe they have volume chips where that is a built-in function.

Grey

Bill Fitzpatrick · 10th January 2005, 01:43 AM

You could do this with a 60 stage CMOS shift register and 60 FETs used as switches for the speakers. Your power requirement seem low so I think we are talking about 50 cent FETs.

The input to the shift register chain is a single pulse for which the repetition can easily be adjusted with a pot.

This solution is reliable and extra cheap. You can send the savings to me.

gmphadte · 10th January 2005, 04:10 AM

A suggestion

Can't the sound directivity be generated using multispeaker arrays, instead of so many speakers...like a jet flying on a screen from one side to the other.

Gajanan Phadte

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10th January 2005, 01:33 AM	#11
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	DC pops are no problem. Locate the source of the DC and either service the piece or use a DC blocking cap. Either way, the problem will be solved. The move-from-speaker-to-speaker thing is not a problem either. Relays will work just fine, or you can handle it in the electronics. For what you are describing, I'd probably say to avoid relays--not because they don't work, but because you'll be switching thousands of times per day. Look at the number of cycles a relay can handle, then run the math. You'll start experiencing reliability problems in a few months and it will be a perpetual maintenance headache from then on. The fade down/up on the volume can be handled either analog or digitally, but will be easier digitally as I believe they have volume chips where that is a built-in function. Grey

10th January 2005, 01:43 AM	#12
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	You could do this with a 60 stage CMOS shift register and 60 FETs used as switches for the speakers. Your power requirement seem low so I think we are talking about 50 cent FETs. The input to the shift register chain is a single pulse for which the repetition can easily be adjusted with a pot. This solution is reliable and extra cheap. You can send the savings to me.

10th January 2005, 04:10 AM	#13
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	A suggestion Can't the sound directivity be generated using multispeaker arrays, instead of so many speakers...like a jet flying on a screen from one side to the other. Gajanan Phadte

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