Variable Capacitor

[crivoli]

Can someone please explain the leads of this variable capacitor and how to hook it up?
I have never used one and I want to make sure I get this correct.


Thanks
-crivoli

View attachment 39044

 

[aProgrammer]

160 + 60 = 220

if you connect O and A
you get 220pF max

 

[crivoli]

So is that a wire from O to A and then a wire from A to the circuit and a wire from O to the circuit, and dis-regard G all together?

Sorry, I am new to this!

In my mind I see a wire from A to the circuit and G to the circuit gives me 160

O to the circuit and G to the circuit gives me 60

A to O with a wire from A to the circuit and O to the circuit is 220.


Are these correct or just plain wrong?

Thanks again

 

[audioguru2]

So is that a wire from O to A and then a wire from A to the circuit and a wire from O to the circuit, and dis-regard G all together?

Then you have shorted the variable capacitor with the wire.

In my mind I see a wire from A to the circuit and G to the circuit gives me 160.

Yes.

O to the circuit and G to the circuit gives me 60.

Yes.

If you want their total capacitance of 220pF then connect them in parallel. Connect A to O and to the circuit and connect G to ground in the circuit.

 

[crivoli]

Thanks a ton for the response.

Just to double check I am thinking of this correctly:

A wire goes from A to O. Then a wire from O tp the circuit. ( this is connecting them in parrell, or did you mean in series? ). Then a wire from G to the circuit.  This gives me the 220pf?

So I would have only two wires running from the cap to the circuit, not 3, and I would have the 220pf. Is that correct?

Thanks again

PS. Is there a schematic of a variable cap I can find online?  Thanks