Continue to Site

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Status
Not open for further replies.

LukeKnepp

Member
Hello Everyone...

I am trying to make a Low Voltage Buzzer Warning that beeps on and off, without a microcontroller....
I have a latching detection circuit here that puts out about a 6V signal until the battery is dead, then it drops off and latches off until it is reset....
Signal Buzzer.PNG


This is the signal that I get....

Buzzer Signal.PNG


Now, what I want to know is what kind of MOSFET do I need, and what kind of driver circuit do I need to make this switch ON a buzzer whenever this signal shuts OFF.....

Thank you for your help!!!
 
You could switch the buzzer using a FET plus a high value pull-up resistor, eg. 1M or higher, from the gate to power positive.

Then add another FET between 0V and gate of the buzzer control, with its gate to your control voltage.
The buzzer would be held off with its gate shorted to 0V, until the low voltage circuit tripped.
 
Status
Not open for further replies.

Latest threads

New Articles From Microcontroller Tips

Back
Top