Hi, my project requires 5 pieces of 3v buzzers. Each buzzer shares the output with a led as well. I know that the Led needs a 220Ohm resistor, but I don't know if I should put a resistor for the buzzer. I didn't find how much current does it draw.
This is the datasheet:
https://www.mouser.ch/datasheet/2/400/iezoelectronic_buzzer_ps_en-1131915.pdf
The Buzzer I'd like to use is PS1440P02BT.
Please help,
Thanks
Maybe I'll just go with the 5v version PS1420P02CT
hunelpaso:
Maybe I'll just go with the 5v version PS1420P02CT
Hi, well it would be more efficient and keep the component count down.
2k2 for a current limit resistor for an LED sounds a bit high for 5V supply.
(5 - LED voltdrop)/2k2 = (5 - 1.6)/2200 = 3.4/2200 = 0.001 A = 1mA
Tom.. 
TomGeorge:
Hi, well it would be more efficient and keep the component count down.
2k2 for a current limit resistor for an LED sounds a bit high for 5V supply.
(5 - LED voltdrop)/2k2 = (5 - 1.6)/2200 = 3.4/2200 = 0.001 A = 1mA
Tom..
220 Ohm - typo