adjustable - 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 adjustable - 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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]]> https://delphijustin.biz/simplest-variable-fuse/feed/ 0 0-30v/0-60v dual power supply https://delphijustin.biz/0-30v-0-60v-dual-power-supply/?utm_source=rss&utm_medium=rss&utm_campaign=0-30v-0-60v-dual-power-supply https://delphijustin.biz/0-30v-0-60v-dual-power-supply/#respond Mon, 03 Apr 2023 16:48:35 +0000 https://delphijustin.biz/?p=4629 Here’s a type of powersupply you should have. It’s good if you’re dealing with OP amps. I took the circuit from eleccircuit.com and modified it to incorporate 2x printer power supplies instead of an AC transformer. It provides a ground that are both positive and negative. LM317 and LM337 regulators are utilized in this circuit. …

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]]> Here’s a type of powersupply you should have. It’s good if you’re dealing with OP amps. I took the circuit from eleccircuit.com and modified it to incorporate 2x printer power supplies instead of an AC transformer. It provides a ground that are both positive and negative. LM317 and LM337 regulators are utilized in this circuit. They are the main components of the circuit. It uses 2 diodes and a 2.2k 2W resistor for each regulator’s adjustment to 0v. It has 3 diodes for each regulator to be used as its protection diodes like capacitors and short circuits. The two 5K potiometers adjust the output voltage at each output. Printer power supplies are perfect for this project since their voltages are not too high or low.

The project is built on a dick Tracy lunch box. With the printer power supplies inside with a c7 power cord splitter. It uses LM317 and LM337 to provide both positive and negative voltages. Here’s a joke: So I guess that means the LM317 and the LM337 are like the yin and yang of electronics!

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