# Drive 5 V buzzer with a 24 V power supply

I have this circuit below where I want to use a buzzer that is 5-8V and has a max current of 30 mA. The VCC supply voltage is about 24 V. I know there are voltage regulators or that I could implement a voltage divider with a Zener diode. However, I was wondering if I could just use the implementation below with a 16V, 500mW Zener diode, and a 200 ohms resistor 125mW. Since we want at least 5v for the buzzer to work, If there's a voltage drop of about 3V on the 200-ohm resistor and 16V on the Zener diode, then the current will be about 3V/200 ohms = 15ma. It's good enough to work with no problems?

• Why the 16 V Zener? Commented Dec 22, 2021 at 8:00
• Why not just use a 500 ohm dropper resistor (rated about 1 watt of course). Commented Dec 22, 2021 at 10:06
• Andy, I was also thinking of using just a 1K resistor with at least 500mW. I want to make the implementation simple but still effective.
– Citi
Commented Dec 22, 2021 at 18:37
• winny, I thought using a Zener diode in my effort to bring the voltage down to not damaged the buzzer, but i think to make it smiple I've could just use 1K ohm resistor with at least 500mw
– Citi
Commented Dec 26, 2021 at 1:13