Small Cap between OpAmp Input Pins?

[Shahriar]

Hi

In the following picture which belongs to a Tone Control Circuit, Can anybody tell me what that Small Value Cap (10pF) Is for?
Between In+ & In- Pins

I remind I saw the reason somewhere Once, but todayI looked it up in all my books, But did,'t find that.

I guess it is some how related to OpAmp Input Capacitance?

Thanx in advance
Shahriar

View attachment 38447

 

[audioguru2]

I think the small valued cap stops problems caused by radio or TV pickup.

 

[MP1]

It is common to pick up a nearby radio station in tone circuits. 8 to 15pf is commonly used.

MP

 

[oladiladio1]

It is used to block all RF interference.