Swapping capacitors.

[supernaut]

I went and bought some capacitors today for this build http://www.geocities.com/j4_student/voxtreb.jpg and when I saw the size of the MKT .47uf cap I decided to go with the more compact electrolytic one. I just need to know what way do I solder it in due to it not being bi-polar?

[BAARON]

Negative terminal attaches to the volume pot, positive side goes to the transistor.

[supernaut]

Okay thanks. So how do you work it out? Because that is the opposite to the 10uf one.

[R.G.]

Okay thanks. So how do you work it out? Because that is the opposite to the 10uf one.

The capacitors are marked with a "+" and a "-" symbol. The way you work is out is that the pin with the "+" symbol always goes to the place in the circuit where the voltage is more positive.

It may be that you're missing the fact that the DC voltage at the top of the volume pot is zero. This is because the capacitor itself blocks all DC, and the volume pot then sucks the end of the capacitor connected to it down to zero volts. If that end is at zero, then the other end of the capacitor must be more positive, because wherever you connect it to the rest of the circuit, it's going to be more positive than ground; that's because the circuit is powered from 0V and +9V, so no place in it can be more negative than ground. Hence, the negative marked end goes to the volume pot.

[supernaut]

Oh ok, thanks for the explanation. Also sorry to BAARON, I read your post wrong. Out of interest though, why is it 0 volts at the top of the volume pot?

[R.G.]

... Out of interest though, why is it 0 volts at the top of the volume pot?

... the DC voltage at the top of the volume pot is zero. This is because the capacitor itself blocks all DC, and the volume pot then sucks the end of the capacitor connected to it down to zero volts.

[supernaut]

Oh god I'm an idiot. I really am having an issue with reading posts arn't I haha.