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Alastur

what a substitute for a micro relay?

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i want substitute a micro relay because i think it is making a lot of noise to the rf with its electromagnetic field.

I was thinking in a pair o optocouplers or something like that. Could you help me with this question? , i need to switch between two different audio inputs to only one output.

thanks in advance

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for audio use 4066

http://www.datasheetcatalog.com/datasheets.../6/6/4066.shtml

that is cheap and will work,

some even use 4066 for video at higher impedances, dont work

if video is at 75 ohm :-)

but audio if often in k ohm range, so no problems here, just center the signal with voltage divider resistors on the input, and use series capacitors to transfer the audio, also on the output.

see here:

http://www.pic101.com/audiosw/index.html

Edited by ThomasScherrer

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Thank you Thomas, i want switch between an lm386 1w amplifier and the mic input

at this moment i used a micro relay activated by one pin of a microcontroller pic 18f252.

Do you know something of dil-8 or less pins?

Thanks in advance

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Hi, Alastur

I saw once small relays in a TO 99 or so case ... but price was "not so small" :blink:

( Swiss made ... if I remember !!! )

This one also, from Conrad.de :

http://www2.produktinfo.conrad.com/datenbl...IS_A12WK12V.pdf

I have here very small Old Avionics relays ... but 28 v !!!

Alain

Edited by Acetronics

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