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pin configuration of 3 pin variable capacitor or Trimmer capacitors

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neo_star

New Member
i need to vary the capacitance of the capacitor
and i have attached a pic of it
it is to be used for tuning purposes
 

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Sceadwian

Banned
You turn the little screw on top... Usually with a long (keep your hands away from it) plastic screw driver. Never metal, it effects the tuneing.
 

neo_star

New Member
wat pins to connect so tat it acts as a variable capacitor
 

audioguru

Well-Known Member
Most Helpful Member
Why not look at its datasheet?
But since they are not made anymore you might not find a datasheet.
Philips used to make them.

The two pins across from each other are the same and you can measure their continuity with an ohm-meter. The other pin is the other contact.
I can't remember which is the adjusting screw.
 

Boncuk

New Member
I can't remember which is the adjusting screw.
Hi audioguru,

what happened? I supposed your eye surgery was alright.

The adjusting screw is the brass thing on top with a slot in it. :)

Hans
 

audioguru

Well-Known Member
Most Helpful Member
I can't remember which terminal is the adjusting screw.
Maybe it should be the grounded or common terminal so things near the screw don't affect the capacitance much.

I have a circuit with one of those old trimmer capacitors but I couldn't find it.
 

JimB

Super Moderator
Most Helpful Member
wat pins to connect so tat it acts as a variable capacitor
Suggestion, use proper English not garbled text-speak.

As for the capacitor, see my comments in the attachment.
The moving vanes should be connected to a point which has no RF voltage, that way there will be little/no interaction when touching the screwdriver slot.

JimB
 

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