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Soil Heater For Plants Circuit

2017-08-19 17:05  
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A TDA1024 electronic thermostat senses soil temperature via thermistor R6. The circuit uses zero-crossing switching of the heater. The heater is made of elastic-coated steel wire. PI is used to set the temperature. The heater should have 2 or more resistance and operate from the 9-V transformer.
Soil Heater For Plants Circuit

About 40 W of heat is available.

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