Placement of capacitors

[ElecTech]

I found a schematic online. Here is the link:

https://freecircuitdiagram.com/wp-content/uploads/2008/10/two-transistor-fm-transmitter.gif

Would someone please explain briefly the purpose of having C2 and C3 in parallel?

I'm well enough acquainted with electronic technology to follow how the circuit works, and the addition of capacitors and so on; however, I do not understand how this is necessary or beneficial.

Thanks

 

[Gayan Soyza]

It is to eliminate high frequency ripple.

 

[crutschow]

The capacitors are for decoupling (filtering) noise. Large electrolytic capacitors work well at low frequencies but have relatively high inductance so they don't work well at high frequencies. Small film or ceramic capacitors are too small to work at low frequencies but have low inductance so they work better at high frequencies. Thus the two are placed in parallel to provide good decoupling over a larger frequency range then either one by itself would do.

 

[ElecTech]

AAAAAAHHHHHHHHHHHHH, Thank you so much! It makes SO much sense! I thought that in schematics, electrolytic capacitors were demonstrated using either the "+" or "-" to one side, to indicate polarity. I suppose that's not always the case.

Thanks again

 

[BrownOut]

It should be the case. Not everyone follows the convention, however.

Another way would be to use a straight line for the + terminal, and a curved line for the - terminal.