El circuito TTL que presentamos tiene finalidad recreativa, pero eso no significa que no pueda servir de base para un trabajo sobre lógica digital. Se trata de una sirena de dos tonos, aún con base en el circuito integrado 7400. El circuito se muestra en la figura. En este circuito, dos puertas forman un oscilador de audio controlado por las otras dos puertas, que forman un oscilador lento de modulación. En el primer oscilador el tono de audio es dado por el capacitor de 220 nF. El lector puede experimentar 100 a 470 nF. La modulación es dada por el capacitor de 10 a 47 uF. La señal rectangular intermitente generada por el circuito es amplificada por un BD135, o equivalente como el TIP31, y se juega en un altavoz. Para mayor potencia de audio, sólo el transistor puede ser alimentado con tensión mayor, manteniendo los 5 V del integrado.

 


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18.841MBMemory Usage43.47msRequest Duration
Joomla! Version5.2.3
PHP Version8.3.20
Identityguest
Response200
Templatecassiopeia
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Collation
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Conn Collation
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