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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

lm317

  1. V

    LM317 And The Magic Smoke

    I'm designing a project which involves a microcontroller sending data over SPI to two SN74HC595N shift registers which, then control some level shifters to turn on and off some 12v end devices. (The MC and the register circuit are on two separate boards) I want to power the shift registers and...
  2. G

    LM317 Router Power

    Hello, I‘m Stephan, just registered and been looking for a forum to share & advance some projects with other. So m 1st post. Currently I‘m working on „project garden WiFi“. I’ve got 12v solar power available, stored in some larger batteries. So wanted to use it. There‘s an old DIR-615 router...
  3. Electro_Smurf

    Constant Current Circuit using LM317 1200µA

    Dear fellow technicians, As I wanted to make colloidal silver, just for fun, I tried to make a constant current supply. So my powersupply input is 31,5Vdc, and my desired limited output is aprox. 1000-2400µA. In my test circuit I use a potmeter to limit the current, and a leak resister to get...
  4. hesam_m

    How to increase the output current of the LM317 Adjustable Regulator

    LM317 is one of the most popular adjustable regulator chips. The output voltage of the regulator can be adjusted from 1.25V to 35V. However, the chip can deliver currents up to 1.5A which is not enough for some power applications. In this video, I discuss two methods of LM317 current boosting...
  5. E

    LM317 thermal resistance and heatsink selection

    Looking for thermal resistance in the LM317 datasheet from TI, I found something which doesn't make any sense to me. https://www.ti.com/lit/ds/symlink/lm317.pdf Page 4 There're two TO220 packages, which seem differ in the thickness of the tab. One of them is 4.2 ºC/W junction-case, which is...
  6. J

    2N3055 and heat

    I have a 52V transformer that after rect. produces 3.3A at 52V. I wish to use either a LM317 or a LM338 with 2N3055 power transistors. If you run 2N3055's in parallel you are suppose d to have a resistor like a 0.1Ohm 10W from each emitter so that thermal runaway doesn't take place.Surely the...

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