I need help creating a circuit that keeps a buzzer on until reset with a button, simple right?

[Cduvall]

I need to create a circuit that detects a low height and high height and sets a buzzer off until reset by button.

 

[Diver300]

It's not too difficult, but there are a lot of things that would need to go into a design.

What is the thing that you are detecting the height of? Do you mean the voltage, a fluid level, the altitude?

Do you have a power supply? Do you have a buzzer?

How do you want the circuit to be re-armed. When the "height" is too much, the buzzer sounds, then it is reset. After that, what has to happen for the buzzer to sound again?

 

[Cduvall]

I am detecting the height of a chair frame to make sure its not too high or two low. I plan on using two sensors with light beams that when broken set off a buzzer. I guess I can use a latching relay to keep the buzzer on until I push a button to turn it off? I will probably use a24v power adapter for power.

 

[dr pepper]

Heres a description of how to make a relay latching:

Latching Relay Circuit | REUK.co.uk

 

[Cduvall]

Great help, hope this project works out, thank you guys. I have a good idea on how to do this now.

 

[Les Jones]

A small SCR is an alternative solution than a relay. You circuit wold trigger it on and you would use normally closed push button to reset it. I was thinking of something like a 2N5060. You need an SCR with a currrent rating greater then the buzzer current and a holding current rating less than your buzzer current.

Les.