1. Feb 23, 2009 #1

   muh_j18

   

   hi,
   i'm working on a project where i'm using a ttl 7400 ic which need +5v Vcc, how can i use 5v from a battery 9v, variable resistor works?
   thanks

    

   muh_j18, Feb 23, 2009
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3. Feb 23, 2009 #2

   MATLABdude

   

   Science Advisor

   That really doesn't work too well if you're drawing a lot of current, or something that has a lot of variable current draw. It's a lot easier to use a linear voltage regulator, something like an LM7805 (lots of companies make these--National Semiconductor, Texas Instruments, On Semiconductor, etc. etc.) They're cheap and pretty reliable.

    

   MATLABdude, Feb 23, 2009

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