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PICList Thread
'relay substitute'
2000\01\16@214413 by Jane Ifurung

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I'm working on Voice Multiplexer and I'm looking for a
SPSP relay substitute. The relay I've bought is too
noisy, you can hear it vibrate. It has caused my
circuit to malfunction.

The signal I want to switch is an ac-coupled square
wave, 3.0 Vp-p.  Is there any suggestion?

Thanks,
Jane

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*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~
Jane Ifurung
UP Diliman, Quezon City
920-5301 loc 5854
(632)731-3545
spam_OUTjifurungTakeThisOuTspameee.upd.edu.ph
*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~
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2000\01\16@215043 by Dave VanHorn

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> I'm working on Voice Multiplexer and I'm looking for a
> SPSP relay substitute. The relay I've bought is too
> noisy, you can hear it vibrate. It has caused my
> circuit to malfunction.
>
> The signal I want to switch is an ac-coupled square
> wave, 3.0 Vp-p.  Is there any suggestion?

4066 or similar analog switches. You'll need to make sure that the signal
voltage does not go outside the power rails, but these have a negative rail,
so you can use a bipolar supply, or single ended, if you ac couple into the
switch, and bias the switch to half the supply.

2000\01\17@043053 by Jane Ifurung

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Thanks, Mr. Dave. I've tried using 4066 as relay
alternative but when I wanted the signal not to pass
through, the 4066 did not entirely switch the signal
off--- it just attenuated the signal.
What is a better alternative?



--- Dave VanHorn <.....dvanhornKILLspamspam@spam@CEDAR.NET> wrote:
{Quote hidden}

=====
*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~
Jane Ifurung
UP Diliman, Quezon City
920-5301 loc 5854
(632)731-3545
jifurungspamKILLspameee.upd.edu.ph
*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~
__________________________________________________
Do You Yahoo!?
Talk to your friends online with Yahoo! Messenger.
http://im.yahoo.com

2000\01\17@060828 by TIM

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there is an opto-isolator..6-pin device called ocmos ssr.. look in
http://www.digikey.com
on resistance is 2-4 ohms...off resistance in meg ohms...........they have
nc and no units in single package and also dual packages..........100ma @
100v if i recall correct...........i've used them and they work great.......

{Original Message removed}

2000\01\17@141605 by w. v. ooijen / f. hanneman
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----------
> From: Jane Ifurung <.....jane_ifurungKILLspamspam.....YAHOO.COM>
> To: EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU
> Subject: Re: relay substitute
> Date: Monday, January 17, 2000 10:30
>
> Thanks, Mr. Dave. I've tried using 4066 as relay
> alternative but when I wanted the signal not to pass
> through, the 4066 did not entirely switch the signal
> off--- it just attenuated the signal.
> What is a better alternative?

With 3/4 4066 you can make a T switch that attenuates much better: two
switches in series, one from the common point to the ground.
Wouter

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