Questions tagged [normally-open]
The normally-open tag has no usage guidance.
7
questions
1
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0answers
84 views
What is the Umlaut Symbol in this relay?
I'm wondering if the reoccurring "Umlaut" (Ö) symbol in a manual for a process controller that I'm referencing is an actual electronic representation of something, if so what, or if this process ...
0
votes
2answers
173 views
“Normally closed” switch: does it use more power than a “Normally open” for a low-power battery-powered ATtiny project?
I have a "normally closed" magnetic door sensor, that I'd like to use with an ATtiny microcontroller.
Does a "normally closed" switch use more power than a "normally open" switch?
i.e. since the ...
4
votes
3answers
718 views
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
90 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
210 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
1k 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
100 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 ...
