electronics question!

[billybob_81067]

Ok say I have a device that runs off of two 9 volt batteries and want to add a digital counter that runs off of a button battery to run off of the two 9 volts. What would I use to reduce the voltage?

Resistors? I don't know if they cut the voltage or just the current. Enlighten me!

[Danimal82]

The resistors will cause a voltage drop.

[gimp]

V = IR

Look up series and parallel circuits, and how to do the voltage/current divider equation. it's pretty simple. It depends on how you connect the resistor.

[billybob_81067]

Alright, sweet... now I've got some insight to that. Now another question. Do any of you know of any good websites that sell switches of all kinds, relays, and resistors at a reasonable price? Radio shack doesn't have nearly enough of a selection for my tastes!

[KayleAGD]

Alright, sweet... now I've got some insight to that. Now another question. Do any of you know of any good websites that sell switches of all kinds, relays, and resistors at a reasonable price? Radio shack doesn't have nearly enough of a selection for my tastes!

https://www.digikey.com

[gimp]

http://www.newarkinone.com