a solution for a bell to continue playing music after releasing switch

[Fahime]

PLease see the attached circuit. It's a home musical bell circiut. When I hit the microswitch then the bell melody starts to play. The problem is that it doesn't stop playing while there is supply voltage. I want to change the design to fulfill following desires:
1. Only while I hit the switch the supply voltage connects to the circuit.
2. The time switch is hold, I need an additional circiut part that saves voltage to run the music even after releasing the switch. Due to this goal I inserted the capacitor accross the voltage supply. But I didn't get the resualt I expected.

What do u reccomend?

 

[audioguru]

Your attached schematic isn't attached.

A capacitor begins discharging immediately when its charging is stopped. Its voltage will drop exponentially.
A timer circuit is needed like a 555 timer driving a switching transistor, to keep the voltage high until the timeout occurs, then it switches off the load.

 

[penoy_balut]

audioguru's advice solves your problem Fahime, plenty of 555 circuits on the net, just wire it as monostable, putting pin 2 to low outputs a high on pin 3 that can be used to drive a switching transistor, upon releasing pin 2 pin 3 is still high which the duration depends on the capacitor connected on the threshold pin 6, the higher the value the longer the delay.

 

[Fahime]

Thanks for your solution. I think it would be a good idea
I'll try that.