lo fi pt2399 layout question

[timd]

I have a question on this layout:

http://www.aronnelson.com/gallery/main.php/v/Renegadrian/PT2399+lo-fi+delay+vero.gif.html

a and b are marked "10p" and "47p". What value capacitor is this? Way too small to be picofarad right?

[cloudscapes]

Might be. The chip runs in the Mhz so those would be good cap values to filter noise out from the rails.

[timd]

I have used 100n for both a and b to some good effect. This circuit needs some type of power behind it though. I'll try an amp chip...

[armdnrdy]

The designations "p" or "pf" for capacitors denote picofarad.

1 microfarad (uf) equals 1,000000 pf

With that being said, those "small" 10p and 47p caps aren't too small to be picofarad.


As I was writing this you wrote that you were using 100n caps in place of the 10pf and 47pf.

Just so you know 1 nanofarad = 1000 picofarads your quite a bit off the mark of how it was designed.

[Kesh]

The data sheet suggests 47u for B and 100n for the A caps.

[knutolai]

According to Renegardian himself (in another thread, cant seem to find it right now) that circuit woun't give you very musical results. At least try putting a buffer in front of it

[timd]

Thanks everyone!