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PICList Thread
'pic-sound card'
1998\11\11@201714 by Hanafi Tanudjaja

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may I connect output from 16c54 (one pin of portb ) directly to mic input of
sound card ?
(just curious)

TIA
Hanafi Tan

1998\11\12@065312 by aya Baptista

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not directly. you should put a capacitor in series (in case your sound card
doesn't have one already) and a voltage divider. 5V is much too high for a
MIC input which should be driven with just some millivolts.

Regards,
AndrŽ Malafaya Baptista


-----Original Message-----
From: Hanafi Tanudjaja [spam_OUTivkvplneTakeThisOuTspamCENTRIN.NET.ID]
Sent: Quinta-feira, 12 de Novembro de 1998 01:17
To: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU
Subject: pic-sound card


may I connect output from 16c54 (one pin of portb ) directly to mic input of
sound card ?
(just curious)

TIA
Hanafi Tan

1998\11\12@073959 by paulb

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Hanafi Tanudjaja wrote>

>> may I connect output from 16c54 (one pin of portb ) directly to mic
>> input of sound card ?  (just curious)

AndrŽ Malafaya Baptista wrote:

> not directly. you should put a capacitor in series (in case your sound
> card doesn't have one already) and a voltage divider. 5V is much too
> high for a MIC input which should be driven with just some millivolts.

 Five millivolts sounds quite generous.  Try a 0.047µF capacitor in
series with a 1 Mohm resistor, in series with the output of the PIC and
a 1k ohm resistor from that at the "Mic" input of the soundcard, in
parallel to ground.

         0.047µF   1M ohm
   PIC o----||----\/\/\/\----+------o Mic in
                             |
              *----\/\/\/\---*
              |    1k ohm
   Gnd o------+---------------------o Gnd
--
 Cheers,
       Paul B.

1998\11\13@091013 by Wayne Foletta

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Hanafi:

Use the sound card's "Line Input" for better signal to noise and because it is
setup for Volt level inputs. You may not have to use an attenuator at all.

-Wayne Foletta
Data Acquisition Systems
SiliconSoft, Inc.
http://www.siliconsoft.com


Hanafi Tanudjaja wrote:

> may I connect output from 16c54 (one pin of portb ) directly to mic input of
> sound card ?
> (just curious)
>
> TIA
> Hanafi Tan

1998\11\23@144103 by Kalman Toth
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You may but sound card do'nt like...

-----Original Message-----
From: Hanafi Tanudjaja <ivkvplnespamKILLspamCENTRIN.NET.ID>
To: .....PICLISTKILLspamspam.....MITVMA.MIT.EDU <EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU>
Date: 1998. november 12. 2:32
Subject: pic-sound card


>may I connect output from 16c54 (one pin of portb ) directly to mic input
of
>sound card ?
>(just curious)
>
>TIA
>Hanafi Tan
>

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