Detailed descriptions and diagrams of an improved electronic system for recording the feeding activity of aphids are presented and compared with previous designs. The most significant improvement involves the use of a sharply tuned 20 Hz high gain amplifier for selectively amplifying the test signal while rejecting other frequencies. This amplifier design and the use of solid-state integrated circuitry has resulted in a compact monitoring unit with a high immunity to extraneous electrical interference.ResumenSe presentan descripciones y diagramas detallados de un sistema electrónico mejorado para registrar la actividad de alimentatión de los áfidos y se compara con modelos anteriores. Las más importantes mejoras son el uso de una fuente de oscilación de 20 Hz, un amplificador agudamente entonado a la frecuencia de 20 Hz y el uso de un circuito integrado de estadosólido para producir una unidad compacta que es relativamente inmune a interferencias eléctricas externas.
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