Published:2011/9/8 1:42:00 Author:Ecco | Keyword: Electronic thermostat theory , designing | From:SeekIC
Note: It has third gears of off (off), Lo (low power), HL (high power). When the switch SA is switched to Lo, 220V electric supply is added to both sides of load RL by the diodes VD4, VD56; as diode makes the RL working voltage be significantly lower than the 220v at the effect of half-wave rectifier, the RL temperature drops.
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