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image of trimmer capacitor upside down.

Hello, I'm trying to make project 11 in Dick Smith's book "Funway into Electronics 2." I'm making it on a breadboard because I don't have a kit.

I am struggling to find out where the positive is on the trimmer capacitor.

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  • \$\begingroup\$ Connect your multi-meter up to it and find out what rotation direction corresponds with what resistance change. Not that it really matters in how you wire it up since resistors aren't polarized. \$\endgroup\$ – DKNguyen Jun 14 at 21:40
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    \$\begingroup\$ @DKNguyen: Trimmer capacitors don't usually register anything reasonable on an ohmmeter... \$\endgroup\$ – JRE Jun 14 at 21:53
  • \$\begingroup\$ @JRE Oh it's a capacitor. Didn't notice that, and I doubt the OP has an LCR meter. Either way, not polarized so stick it into the circuit in any direction and turn it to find out. \$\endgroup\$ – DKNguyen Jun 14 at 21:54
  • \$\begingroup\$ trimmers “May” have < 1pF more stray capacitance on one lead vs the other. Inspection of part or datasheet may tell, which is which but probably won’t matter since it can be “trimmed”. (Lol) \$\endgroup\$ – Sunnyskyguy EE75 Jun 14 at 21:57
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Trimmer capacitors and low value fixed capacitors are not polarized, so won't have a "positive" indication.

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