Developing a self-regulating soldering iron based on induction heating

This work focused on the design, development and construction of a new low cost soldering iron that works by means of induction heating. The amount of electronic components has been minimized in order to reduce production costs. Additional tests were undertaken to determine the ideal tips for soldering, and the adaptations necessary to guarantee self-regulation using a nickel foil shield (due to its low curie temperature) are suggested. The new device contains a resonant inverter able to generate alternating magnetic fields of 100 kHz at the center of an 18-turn coil; the inverter is controlled only using an astable oscillator circuit. The paper examines criteria to select suitable soldering-tips by experimentally determining their equivalent resistance heating it within the resonant inverter or well, another one by using a rapid magnetic test. The system represents a good tool, suitable for the manufacture of development boards or electronic tasks

A viable wireless PC assisted alternative to studies of vectorcardiography

The development of an analog device to wirelessly modulate and record twelve cardiac leads, PC assisted is reported. The system, which has been developed using low cost components, contains only one signal conditioning stage and one stage for amplitude modulation with FM transmission/reception. Also it contains an interface to select the cardiac leads remotely, which is based in the transmission/decoding of audible dual frequency tones. The device has been tested on a group of volunteers simultaneously using a registered trademark electrocardiograph, to assess the performance of the new device. Furthermore, the experimental results indicate that the device is a tool suitable to conduct studies of vector-cardiography with maximum uncertainties of 20 % in the cardiac axis orientation measurement

Developing a self-regulating soldering iron based on induction heating

This work focused on the design, development and construction of a new low cost soldering iron that works by means of induction heating. The amount of electronic components has been minimized in order to reduce production costs. Additional tests were undertaken to determine the ideal tips for soldering, and the adaptations necessary to guarantee self-regulation using a nickel foil shield (due to its low curie temperature) are suggested. The new device contains a resonant inverter able to generate alternating magnetic fields of 100 kHz at the center of an 18-turn coil; the inverter is controlled only using an astable oscillator circuit. The paper examines criteria to select suitable soldering-tips by experimentally determining their equivalent resistance heating it within the resonant inverter or well, another one by using a rapid magnetic test. The system represents a good tool, suitable for the manufacture of development boards or electronic tasks.Este trabajo se enfocó en diseñar y construir un novedoso cautín económico que funciona mediante inducción magnética. Se han minimizado la cantidad de componentes electrónicos que lo conforman para disminuir su costo de producción y también se realizaron pruebas para determinar las puntas óptimas para soldar, proponiendo las adaptaciones necesarias para lograr la autorregulación empleando una cubierta de lámina de níquel por su baja temperatura de Curie. El nuevo dispositivo se compone de un inversor resonante capaz de generar campos magnéticos alternos de 100 kHz en el centro de una bobina de 18 espiras y éste se controla solamente con un circuito oscilador astable. Se discute un criterio para seleccionar las puntas reemplazables, basado en la resistencia equivalente obtenida experimentalmente del inversor resonante o bien otro criterio haciendo un rápido ensayo magnético. El nuevo dispositivo representa una herramienta adecuada para realizar tarjetas impresas de circuitos o tareas de electrónica

Developing a fast cordless soldering iron via induction heating

This study aims to present the design of a new soldering iron for welding electronic components that work via AC magnetic fields. Moreover, the device has been designed to operate in cordless mode. The system comprises of a resonant inverter that is capable of generating an alternating magnetic field of 250 kHz in the center of a coil of 11 wires. The heating element is a cylindrical piece of ferromagnetic stainless steel with a concentric core of copper, which is maintained in contact with a standard and commercial tip. Additionally, we determined the power factor and the efficiency of the energy transfer with a maximum power consumption of 134 watts. The system represents a good tool suitable for the realization of development boards or electronic tasks

Developing a fast cordless soldering iron via induction heating

Se presenta el desarrollo de un dispositivo para soldar componentes electrónicos, el cual funciona a base de campos magnéticos alternos. El dispositivo ha sido diseñado para trabajar sin cableado. El nuevo soldador se compone de un inversor resonante capaz de generar campos magnéticos alternos de 250 kHz en el centro de una bobina de 11 espiras. El elemento calefactor es una pequeña pieza cilíndrica de acero inoxidable magnético con un núcleo concéntrico de cobre, el cual se encuentra unido a una punta reemplazable para cautín comercial. Adicionalmente hemos determinado el factor de potencia y la eficiencia en la transferencia de energía con un méximo de consumo de potencia de 134 Watts. El dispositivo representa una buena herramienta adecuada para la realización de tarjetas impresas para circuitos o tareas de electrónica

A viable wireless PC assisted alternative to studies of vectorcardiography

Se presenta el desarrollo de un dispositivo analógico, para mod ular y registrar de manera inalámbrica las doce derivaciones ca rdiacas con una PC. El sistema que ha sido desarrollado con componentes de bajo costo, contiene una sola etapa de acondicionamiento de señ ales, una etapa de modulación de las señales en AM con transmisión/re cepción en FM, más un medio de selección de las derivaciones de manera remota, basado en la transmisión/decodificación de tonos audibles de doble frecuencia. El dispositivo ha sido probado e n un grupo de voluntarios de manera simultánea empleando un electroc ardiógrafo de marca con el fin de evaluar su funcionamiento. Lo s resultados experimentales indican que el sistema es una herrami enta capaz de conducir estudios de vectorcardiografía con una incertidumbre máxima del 20 % en la medición de la orientación del eje cardiaco