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Mystery component in motor speed controller

jimmyblacksmith

Feb 26, 2024
3
Joined
Feb 26, 2024
Messages
3
Hi,
This circuit is a 240 volt motor speed controller. There's a missing component (blank space above the triac), which looked like a zener diode, but it melted, so I can't identify it. I've tried diodes, thermistors, and diacs, but the motor only runs at top speed, or not at all. Can anyone tell me what the missing component should be?
 

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Alec_t

Jul 7, 2015
3,590
Joined
Jul 7, 2015
Messages
3,590
+1 for diac. If that hasn't solved the problem there must be some other component faulty. The triac is the most likely culprit.
 
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