You could reverse the positions and use an NC button, but that would draw power continuously through the resistor. One application for a 1NC1NO combination switch is in emergency shut-off devices, like the 'red mushrooms' common on industrial equipment. By using both switch types, the system can go into a shut-down state in most failure modes:

2019年1月25日 · Okay so I have two questions. I am looking at a schematic diagram of a remote control for a toy car and I can't seem to figure out what the "n/o" and "n/c" components stand for that are attached to...

2023年4月18日 · I want to create a NC switch in my electrical circuit to take power away from the 3.7 V internal battery when 5 V is received on a micro-USB for charging. By 0 V I mean No Connection or a mV, not G...

2016年2月8日 · The easiest method is to remove the transistor and both resistors connected to the base of the transistor (10k, 47k). Then connect the free end of the switch to where the collector used to be. If this is an existing circuit board, remove the above components. Then install a jumper where the 47k resistor used to be and another jumper between where transistor …

2019年3月31日 · Is it possible to have "Normally closed" switch with NPN transistor when the voltage at the base is 0V? So far I only managed to achieve this result with NPN transistor when the base is HIGH. When ...

2021年3月19日 · So I got to testing (tapping each switch with the back of a screwdriver) and it seemed my theory was right! At this point, my switches are NC microswitches, so I thought I'd get some slightly better switches more suited (they're still cheap but they at least they're called limit switches). But, same problem, when I tap them, they trigger.

2015年10月27日 · I am looking for a way to use a MOSFET as a normally closed switch such that when a battery charger is attached it opens the switch to disconnect the battery from the rest of the circuit. I want th...

I can't figure how to wire it in series with the physical NC switch (to still use only one input), even with a transistor for inverting the signal, and still mantaining the safety of if any of the switches (opto of physical) fail, the circuit will be open and the controller will halt.

2021年11月18日 · The original power switch was in strange configuration of NO+NC, although I was not able to find nowhere any replacement. Powered from a terminal block for a short while and without a load (so technically NO+NO "switch"), motor was working fine. The question is: Can I implement just a standard NO+NO switch instead?

2017年3月20日 · I want to read the state of a normally closed switch (waterlevel sensor) with a MCU. The NC-switch is connected over two about 20 meter long cables. The MCU wakes up periodically and enables a exte...