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Electronic Thermostat schematics

Hello everyone. I am new to this forum . I hope some of you may be able to help me out. I am looking for a schematic for an electronic thermostat. The thermostat must have a input voltage of 120 VAC and be able to control up to a 400 watt resistive load (heating nichrome wire coil). Would any of you have any schematics or any suggestions ? I have looked on line and in several electronics books and have been unsuccessful. Thanks!
 
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