# Best way to lower a signal voltage

I'm interacting with a computer and the return high (1) is at 12V but I need it to ~5V. What is the best way to lower the voltage without affecting the signal (serial) ? I already thought of a voltage divider but I was wondering if there is a better way ...

• Simplicity is best and, like vladimir says, if it's a one way comms thing then go for the resistor divider. Jul 3 '14 at 21:18
• Better in what way? Jul 3 '14 at 21:23
• @KGregory in a simple way. Maybe you are addressing your question to the OP? Jul 3 '14 at 22:01

If your connection is one way only and you are fine not insulating your device from your computer then a voltage divider is cheap and perfectly fine. Please note that the divider total resistance may affect speed and power consumption, I'd go for a total resistance not higher than $10k\Omega$.