reset - Delphijustin industries https://delphijustin.biz Making use out of things! Thu, 19 Sep 2024 21:45:48 +0000 en-US hourly 1 https://wordpress.org/?v=6.2.9 https://delphijustin.biz/wp-content/uploads/2025/10/cropped-dongwa-192-32x32.png reset - Delphijustin industries https://delphijustin.biz 32 32 Simplest Variable Fuse https://delphijustin.biz/simplest-variable-fuse/?utm_source=rss&utm_medium=rss&utm_campaign=simplest-variable-fuse https://delphijustin.biz/simplest-variable-fuse/#respond Tue, 10 Sep 2024 14:52:13 +0000 https://delphijustin.biz/?p=5250 This is a TL431 comparator fuse that can be made on a breadboard,pcb or even copper tape. It uses a 1.5V Battery(Can be AA,AAA,C or D). Its used to add 1.5V to the voltage drop across the current sense resistor. This is needed since it can only turn on at 2.5V at the reference pin. …

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]]> This is a TL431 comparator fuse that can be made on a breadboard,pcb or even copper tape. It uses a 1.5V Battery(Can be AA,AAA,C or D). Its used to add 1.5V to the voltage drop across the current sense resistor. This is needed since it can only turn on at 2.5V at the reference pin. The 431 can be found in a lot of switching power supplies, just look for a tiny transistor looking device containing the number 431. This fuse is better than poly fuses and circuit breakers.

Here are some equations for current sense resistor:

$$R_{sense}=\frac{1}{I_{trip}}$$

$$P_{sense}=I_{trip}^2R_{sense}$$

$$V_{max}=\sqrt{R_{sense}P_{sense}}$$

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