The HY5600 is a subminiature proportional temperature controller for thermoelectric coolers (TEC). This device is intended for "cool only" fixed temperature applications where front panel controls and digital readouts are not required. The HY5600 operates in conjunction with a thermistor bridge to precisely measure and regulate the temperature of a device affixed to a TEC. With proper heat sinking, this device will sink up to 2 Amperes of current and will operate at a supply voltage up to 12 Volts.