Please good guys in the house, I need your assistance.

There is this small christmas light alarm box that comes with the christmas light which i connected to NEPA light  (ON/OFF switch) to alert me whenever NEPA brings light and am on Generator.  When NEPA takes light, I switched the alarm ON and then put on the Generator. When NEPA restores light, the alarm comes on with the Christmas song and I know (in fact my kids knows) NEPA light has been restored. I then switch the alarm to OFF to stop the sound.   

So presently, the Christmas alarm box is faulty.  Its no longer works(I actually bought 3 and they have all gone bad). I know it is achievable electronically.

What I have in mind is a circuit diagram (very simple one) that can just make sound (any sound) with a small transistor radio speaker and few electronic devices.   Please guys, help me.

Are u contemplatiog of repairinp dis device by yourcelf? If so, Are u technically sound or a techician? If yes. Ur problem is half solued. So relax a solution wil come sooner dan u thought. Gond luck to u.

@badesco
Thanks for your quick response. Really, I don't intend to repair the alarm because it will just be a waste of time. I can see that the system is not rugged enough that is why it breaks down often.

What I want is somebody to help me with a circuit diagram that can achieve something close to the christmas alarm. Something that can power a small speaker to make a sound.

I am electronic person but I am too rusty. Rusty in the sense that I can not design anything now but I can put things together and solder.

This Nepa alarm system is better than the electric bulb that this electricians install in our homes because if you are not close to where it is installed, you won't be able to know NEPA has restored light but for the alarm, it is instant. Everyone who uses it will appreciate it.

OP, are you still interested in this?

I am interested

bravoalpha:
I am interested

If you are tech. savvy, you can check this thread for a warning circuit that uses a siren and a timer: https://www.nairaland.com/1988764/electronics-circuit-design-concept-implementation/3
Or get a ready made product like the one in the pic below. These ones goes for #4k each. It has both visual and audible indicators.

Please how do I get the ready made you posted?
I need it urgently.

let me draw 1 for you

babaegun:
Please good guys in the house, I need your assistance.

There is this small christmas light alarm box that comes with the christmas light which i connected to NEPA light  (ON/OFF switch) to alert me whenever NEPA brings light and am on Generator.  When NEPA takes light, I switched the alarm ON and then put on the Generator. When NEPA restores light, the alarm comes on with the Christmas song and I know (in fact my kids knows) NEPA light has been restored. I then switch the alarm to OFF to stop the sound.   

So presently, the Christmas alarm box is faulty.  Its no longer works(I actually bought 3 and they have all gone bad). I know it is achievable electronically.

What I have in mind is a circuit diagram (very simple one) that can just make sound (any sound) with a small transistor radio speaker and few electronic devices.   Please guys, help me.

its going to be like that, RC timing.
the buzzer will be triggered for few seconds when power is restored, value of resistor and capacitor determines the time.

the lamp in the cct will be replaced by a 5v buzzer.

need more explanation?

If you are tech. savvy, you can check this thread for a warning circuit that uses a siren and a timer: https://www.nairaland.com/1988764/electronics-circuit-design-concept-implementation/3
Or get a ready made product like the one in the pic below. These ones goes for #4k each. It has both visual and audible indicators.

I need this stuff, how can I get one? If it's not available does anyone know where I can get a notifier like this?

Regards