Instructables

how to reduce 5v dc to 2.5v dc?


I need to reduce a 5v power supply to 2,5 v for a certain application, I've got a converter that can do it, but want to do it using some electronics
any ideas?

luxstar2 years ago

Here is an instructable using a DC to Dc converter:

 

 

http://www.instructables.com/id/93-efficient-DC-to-DC-Converter/

The data sheet says the input voltage can be as low as 4.5 volts. The output can be adjusted from one half volt to 6 volts.

AndyGadget3 years ago
 
Use 4 power diodes in series.  Each one will give you a drop of 0.6V -ish.  Four will give you 5V minus 2.4V = 2.5V near enough.

As Sean says, an enumeration of the methods of separating felis domesticus from its epithelium equates to a value of greater than unity.
One of the simplest ways would be to use a circuit based on a LM317 adjustable voltage regulator. They are simple to use, widely available, and cheap. It is a 3 terminal device like many other linear regulators, but you need to include a coulple extra resistors to set the desired voltage.

The datasheet itself has many sample application circuits, and there are tons on the web as well.
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fjchorn (author)  seandogue3 years ago
shweet, i'll try both, the thing is i've got allot of 5v power from a solar system,using a 7805 regulator,now i want to run a mosquito killer of it,one of these snap crackle pop things, using the 5v to power leds and also pulling 2,5v ro run the device vith a 555 ic, will this work?