Can I replace ceramic or electrolytic capacitors with polyester film capacitors.

 

Without specific information/schematic, it is impossible to say. Provide a clue as to the application

 

It's a simple 555 circuit but I find it difficult finding the right parts on the Internet .

 

Poly-film caps are among the best, but usually a bit high priced.

 

Well, give it a try, experimenting is fun and teaches a lot

 

Well, give it a try, experimenting is fun and teaches a lot

I just hope the thing doesn't blow up on me. Thank you nonetheless .

 

I just hope the thing doesn't blow up on me. Thank you nonetheless .

Unlikely to blow up, it will either work or not. the 555 is quite robust, just don't exceed it's voltage rating.