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Welcome. I wanted to provide stripboard layouts I've made to help people new to electronics and even the more experienced get into different aspects of electronics.

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Wednesday, 16 May 2012

LM317 Fragment Stripboard Veroboard


I often make power supplies for whatever project I design and the simplest and cheapest way is to buy in loads of LM317s (or salvage them or their pin compatible lower current 1117 counterparts) and use a couple of resistors to set the voltage you need rather than having to buy a load of separate value voltage regulators.
you can always just set the voltage with a trim pot but that's messy so we can use a simple equation to get the value needed, but since no one can be arsed to do equations - even simple ones - I have listed values  of voltages I have commonly used.
if you don't have the right value resistor - don't be afraid to make resistor tipis or resistor canoes (series or parallel) to get the right value - every good project has a tipi/canoe in it :)





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4 comments:

  1. Anonymous29 August 2015 at 00:04

    Hi there

    I'm hoping to use this layout to create a starve function for a guitar effects pedal; and I'm quite new to electronics. I want to use a potentiometer to allow me to vary the voltage going to the effects pedal from 9 volts down to whatever it takes to turn the pedal off and anything inbetwen that makes a strange sound! I realise that I need to remove the two resistors that you have on the board and replace them with connections to a potentiometer; but I'm unsure as to what two points on the board do I connect to lugs 3 and 1 of the pot and would the second lug of the pot (wiper) then become the output for the electricity to go to the fuzz pedal? Or would lug 2 connect back to your stripboard layout and the electricity would leave via your indicated output?

    Thanks very much for any advice; your site is fascinating and inspires me to try new adventures in electronics!

    ReplyDelete
    Replies
    1. DrStevenson29 August 2015 at 08:28

      it just so happens that I did a voltage sag project for that very purpose http://www.paulinthelab.com/2014/02/battery-simulator-with-voltage-sag-and.html
      it also has extra filtering to simulate a proper battery more effectively and a cool LED display

      Delete
  2. Anonymous15 September 2015 at 00:00

    I thought the pin numbering for the LM317 is 1 on the far left (if you're facing the flat side) and 3 on the far right; 1=adj, 2=out, 3=in. Is the one on this vero layout reversed?

    ReplyDelete
    Replies
    1. DrStevenson15 September 2015 at 00:20

      no it's as the picture shows http://www.electronica2000.info/wp-content/uploads/2012/05/lm317.png
      :)

      Delete

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