hey , can anyone of you tell a cheaper and efficient way to reduce the frequency of the ac source from about 50/s to 1-5/s?

 

What is the source and how does it operate? If you are talking about line frequency, that is a practical impossibility.

 

Exactly what are you wanting to accomplish? If you are looking for a digital signal that is the result, a binary counter with proper gate functions tied to the output and reset will give you what you are looking for. If you are looking for appreciable power output and a 1-5 hz sine wave, good luck.

 

i just wanted to have a low frequency of 1-5 hz to operate my capacitor for an exp with it,so anywhich way, i want an ac of low frequency. so,is there any possible way?

 

What do you have to start with? A frequency generator that doesn't go that low?

What are you trying to discover about the capacitor in question?

 

Use a transformer to get an appropriate voltage from the 50Hz AC, rectify it, filter it, regulate it, and use it as a voltage supply to power a low frequency sine wave generator circuit.

Or use a ready-made version of the same thing. See "Signal generator".