Analog water-level controller using an LM31 liquid level sensor input and PEL00884 brushed DC motor drive. The circuit buffers and scales the ratiometric sensor signal, derives motor current demand versus water level, shuts the motor off at 100%, and lights a green full-tank LED.

Controlador PID analógico para motor DC con salida PWM aislada mediante PC817, basado en op-amps cuádruples, LM311 y oscilador triangular de ~10 kHz

The LS3018N, manufactured by iSion, is an N-Channel Enhancement Mode MOSFET designed for low voltage drive applications, making it ideal for portable equipment. Available in a compact SOT-323 package, this MOSFET features low on-resistance and fast switching speeds, facilitating easy drive circuit design and parallel configurations. The device operates with a gate-source voltage as low as 2.5V and can handle a continuous drain current of up to 100mA, with a peak drain current of 400mA. The LS3018N supports a maximum drain-source voltage of 60V and a gate-source voltage of +20V. It offers robust thermal performance with a junction-to-ambient thermal resistance of 833°C/W and is compliant with RoHS standards. Key electrical characteristics include a drain-source breakdown voltage of 60V, a gate threshold voltage range of 0.8V to 1.5V, and a static drain-source on-resistance as low as 3.0Ω at VGS of 4V. The component also features minimal input capacitance, making it suitable for high-speed switching applications.

This project is a voltage comparator circuit utilizing an LM311DR comparator and an LM27762DSSR switched capacitor voltage inverter. The circuit takes an input signal, compares it with a reference voltage, and outputs a digital signal indicating which voltage is higher. #project