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It sound very low

 
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smxabi



Joined: 29 Apr 2006
Posts: 14
Location: Spain

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It sound very low
PostPosted: Wed May 31, 2006 10:08 am     Reply with quote
Hi
This is my favorite site to inquire all my troubles. Laughing
Well, I compiled and tested the exercise EX_SQWC from CCS examples:
Code:

#include <16F877A.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
I am using the proto 16F877A from CCS


void main() {

   printf("Press any key to begin\n\r");
   getc();
   printf("1 khz signal activated\n\r");

   while (TRUE) {
     output_high(PIN_B0);
     delay_us(500);
     output_low(PIN_B0);
     delay_us(500);
   }
}
when I conect a loudspeaker from an old mobile phone sound, but very low. In the phone sound quite right. The loudspeaker is SD153B and finding the datasheet I see it has a impedance of 150 ohms (at 1Khz).
The loudspeaker is conected between Pin BO and ground through a condenser of 100k.
I supose is a problem of leveling impedances ¿ But How I do to sound the loudspeaker more strong ?

Thank´s in advance
kender



Joined: 09 Aug 2004
Posts: 768
Location: Silicon Valley

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PostPosted: Wed May 31, 2006 10:55 am     Reply with quote
Use an audio op-amp to amplify the signal to the loudspeaker. LM386 is, probably, the most popular one.
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