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o construir tus propios PCB - Ucontrol

Todo aficionado a la electrónica tarde o temprano se topa con la necesidad de fabricar sus propios circuitos impresos o PCB (por "Printed Circuit Board "). En general, esta tarea es vista como algo muy complicado, cuando en realidad se trata de una labor que fácilmente podemos llevar a buen término. http://www.ucontrol.com.ar/wiki/index.php?title=Como_construir_tus_propios_PCB

Monitorizar tensión de la batería

Tienes que aprovechar que el transistor empieza a conducir cuando la tensión base-emisor supera un umbral (~ 0.7V). Con un divisor resistivo o (mejor) un zéner puedes adaptar la tensión de consigna a ese umbral. Si lo quieres hacer bien busca "Schmitt trigger" en Google. http://www.edaboard.eu/monitorizar-tension-de-la-bateria-t396202,start,15.html
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rs232 to sdi-12 circuit

http://www.zingelectronics.com.au/rs232-to-sdi-12-circuit/s43710
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Welcome to Electronic Circuits/Schematics Directory :: Next.gr

http://www.next.gr/

All About Circuits : Free Electric Circuits Textbooks

http://www.allaboutcircuits.com/ This site provides a series of online textbooks covering electricity and electronics. The information provided is great for both students and hobbyists who are looking to expand their knowledge in this field.
http://www.allaboutcircuits.com/vol_1/chpt_9/7.html

Strain gauges : ELECTRICAL INSTRUMENTATION SIGNALS

If a strip of conductive metal is stretched, it will become skinnier and longer, both changes resulting in an increase of electrical resistance end-to-end. Conversely, if a strip of conductive metal is placed under compressive force (without buckling), it will broaden and shorten. If these stresses are kept within the elastic limit of the metal strip (so that the strip does not permanently deform), the strip can be used as a measuring element for physical force, the amount of applied force inferred from measuring its resistance.