This circuit can use NTCs from 200 to 680 ohms, just change P2. For 200 ohms use 330 ohms, for 250 ohms use 470 ohms and for 680 ohms use 1k5. The circuit is from 2001 documentation and the adjustment of the trigger points are made in trimpots. The SCR must be equipped with a heat sink and equivalent types, depending on the current of the heating element, can be used.
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