Simple constant temperature controllor circuit composed of 555

Published:2011/8/9 2:17:00 Author:Rebekka | Keyword: Simple , constant temperature controllor | From:SeekIC

Rt1 contacts the contact because of the heated expansion, but IC 6 feet is disconnected since the Rt2 is still at the low level, thus the trigger circuit skins. The temperature continue to rise to the upper limit value, Rt2 is conducted, the corresponding 6 feet potential is inhigh level (6 V), it is larger than 6 x two-thirds = 4 V trigger level. The IC resets, the (3) foot outputs low level, SCR stops and the electric heating wires power supply is disconnected. It stops heating. When the temperature drops, Rt2 will be disconnected. For 555 circuit is self-preservation and it still outputs low level feet by (3). When the temperature drops to the limit value, Rt1 is disconnected.



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