this post was submitted on 18 Jun 2023
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How to properly size a serial bulb for protection when troubleshooting a circuit? (discuss.tchncs.de)
submitted 1 year ago by LemmyBr785@discuss.tchncs.de to c/askelectronics@discuss.tchncs.de
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Hello. I'm a hobbist on electronics repairs, and I did some repairs on stuff powered from the wall socket before, using a serial bulb to protect the circuit in case there's a short. Now I want to troubleshoot a board that works at 3V and very low current (like no more than 100mA). So, how can I properly size the bulb I need for this circuit before powering it? Or is there a better way to protect the circuit than a serial bulb? Thanks in advance.

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[–] ConductiveInsulation@feddit.de 0 points 1 year ago

I've successfully used incandescent Bulbs in the past. They have barely any resistance when cold, which is the reason why they usually blow up when you turn them on.

For their size, usually I use more than the power the device will use but less than the wires can handle for a while. In your case id get a lamp with a E10 socket, for example 3.5V 0,7W.

Alternatively you can use a PSU with current limiting features.