Please help me. I've just started getting into electronics and I've made a Jaycar project with a photoresister. The idea of the project is when it is in the dark the buzzer sounds. How can I get the buzzer to sound when it's light and go off in the dark? Is this an easy task?

Thanks for your time!!

 

It's easy if we can see the circuit diagram.

 

Yes if you post the circuit diagram we can help.

 

Hi, boogaville, i'm too a beginner, hmm....
Most probably you must've used transistor in your circuit. Transistor acts as an invertor. i.e
when you've connected the buzzer btw the collector and +ve end of supply, and if it
sounds,then it will notsound when connected btw. the collector and emitter
terminals, and vice versa. So try exchanging the connections..hope it works..

 

There are a half dozen ways to solve the problem. We begin after we see the circuit diagram.

 

Hi, boogaville, i'm too a beginner, hmm....
Most probably you must've used transistor in your circuit. Transistor acts as an invertor. i.e
when you've connected the buzzer btw the collector and +ve end of supply, and if it
sounds,then it will notsound when connected btw. the collector and emitter
terminals, and vice versa. So try exchanging the connections..hope it works..

Generally speaking, there is a much better way to do it, but we need the schematic.

 

Hi, boogaville, i'm too a beginner, hmm....
Most probably you must've used transistor in your circuit. Transistor acts as an invertor. i.e
when you've connected the buzzer btw the collector and +ve end of supply, and if it
sounds,then it will notsound when connected btw. the collector and emitter
terminals, and vice versa. So try exchanging the connections..hope it works..

You are also likely to end up with a blown transistor!

Ramesh

 

Hi, boogaville, i'm too a beginner, hmm....
Most probably you must've used transistor in your circuit. Transistor acts as an invertor. i.e
when you've connected the buzzer btw the collector and +ve end of supply, and if it
sounds,then it will notsound when connected btw. the collector and emitter
terminals, and vice versa. So try exchanging the connections..hope it works..

Not likely. This will change the circuit into an emitter follower and have not enough voltage as its output.

 

The simplest form is 9 V battery, + to one leg of LDR, other leg to + [red] of solid state buzzer, RS 273-060, - [black] buzzer to - battery. LDR used about 1 in dia., 50 Ω bright light, 1M Ω dark.

 

This is the basic shape of what you need. Give numbers about voltage, current, of the buzzer and photocell, to get answers about the transistor and resistors.