The manufacturing process of aquarium heater mainly includes the following steps and key technical points:
Select suitable heating elements: Commonly used heating elements include glass heating rods and soldering iron cores. Glass heating rods are safe and durable, suitable for long-term use; while soldering iron cores are cheap, but less durable.
Design of temperature control circuit: The temperature control circuit can be designed using components such as LM358N operational amplifier, thermistor (NTC) and relay. The working principle of the circuit is to sense the change of water temperature through the temperature sensor. When the water temperature is lower than the set value, the relay starts the heating rod for heating; when the water temperature reaches the set value, the relay turns off the heating rod.
Selection of components:
Temperature sensor: Usually a negative temperature coefficient thermistor (NTC) is used. This sensor has accurate measurement and good stability in the low temperature range.
Operational amplifier: such as LM358N, used to compare the output voltage of the temperature sensor with the set voltage and control the switch of the relay.
Relay: used to control the on and off of the heating rod.
Assembly and debugging: Connect and assemble the temperature sensor, operational amplifier, relay and heating rod according to the circuit diagram. During debugging, it is necessary to ensure that the temperature control accuracy and the response speed of the relay meet the requirements.
Safety measures: Homemade heaters need to ensure waterproof and high temperature resistant design to avoid safety hazards such as leakage and short circuit. Waterproof glue and high temperature resistant materials can be used for packaging.
Cost considerations: The cost of homemade heaters is low and suitable for users with limited budgets. The main costs include the cost of components such as heating rods, temperature sensors and controllers.
