.047pF caps?

[selig]

G'day as i'm new to all this; can anyone tell me where to get .047pF caps as i,m in Australia and have searched the net and it appears that noone here has them . the project i'm doing is a 4 band guitar preamp all i have is a schematic pic to work from it shows the cap going between the circuit and the tone pot , could it be a misprint if not what alternative caps would work many thanks Greg

[52 Bill]

Welcome to the place.

I think that you are really in need of 0.047uF and not pf caps.

I don't think that I've even heard of a cap value that small.

[Enzo]

What Bill said.

.047pf would be a couple of 2cm wires spaced a few cm apart. Really that is a very small capacitance, the wires leading to it would have more capacitance than the part.


In fact in old radio circuits, they sometimes needed something like 1pf to tweak a circuit, and they would stick a couple inches of wire next to each other to make it. That was called a "gimmick" capacitor.

pf = picofarad
uf = microfarad

.047uf is an extremely common part in guitar amps.

[selig]

.047pF cap

thanks to everyone that answered as you can see i'm a novice at this , i thought .047uF seemed more logical , but some places do advertize .047pF caps (e.g unicorn electronics in the U.S) it's pretty confusing i'll try different values see what happens

[Enzo]

Perhaps it is because you are in Australia. American caps must be operated upside down in Australia for proper effect. That would invert their capacitance value. At least I think that is how it works.

[tubeswell]

Perhaps it is because you are in Australia. American caps must be operated upside down in Australia for proper effect. That would invert their capacitance value. At least I think that is how it works.

Why explains why a US site is marketing .047pF caps for Australians... (seeing is believing.)

Unicorn Electronics - Capacitor Dipped Monolithic Ceramic Radial .047pf 50V (Pkg. 12)

[guitician]

It would help if they took a picture of the actual part they're selling...geez

That's a 2.2uf cap in that link...... oh, but "picture is for informational purposes only"......They should get a clue!

[Enzo]

Look at their whole page of monolithic ceramic caps. The seven values offered are:
.001pf
.01pf
.047pf
.1uf
.22uf
.47uf
1uf

Seems darned odd to me to have a line of seven values of a sort of part, three in thousandths of a pf, and the other four in fractional uf. And leaving out the far more useful other uf numbers. I am betting my lunch money that is a typo, and they are all supposed to be in uf.

How on earth would you use a big old part like that at .001pf?

Seeing isn;t always believing, remember Ashlee Simpson?