Questions tagged [normally-open]

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3answers
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Normally Closed Optoisolators

I understand that typical optoisolators can logically be considered as "normally open". However I have a situation where I'd like the circuit controlled by the opto to be normally closed, mainly for ...
1
vote
1answer
68 views

How to wire a normally open switch to a recoil start engine with no external battery?

I am making an engine toggle switch for a recoil-start engine using two switches wired in series for safety. The engine will shut off only when two "kill" cables on the front have been connected. In ...
0
votes
2answers
107 views

how to convert a PWM AC dimmer circuit from normally-closed to a normally-open one?

Hi, As you see in schematic, the circuit is a normally-closed AC dimmer. Therefore when the connection between microcontroller - which produce pwm - and mosfet get halted, the lamp will be always on ...
1
vote
0answers
847 views

changeover normally closed to normally open

I have a switch that is used for setting tool lengths on CNC Mill. The switch operates normally closed, and breaks the signal when a tool touches it, which sets the length via a macro. The control ...
0
votes
2answers
86 views

Liquid level switch with normally open contact

If something is described as a "liquid level switch", and contains a normally open contactor, would this imply that a dry sensor would cause the contactor to open, and a submerged sensor would cause ...