What is this component thingo?

up vote
1
down vote

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I canÃ¢Â€Â™t find or describe what this component looks like. Can anyone help me identify it out of curiosity?

I found it on a PCB for a car alarm, but it has no silk-screen label...

Its has a grub screw that is adjustable. The screw does not seem to make contact with the outer spring but current flows through it no matter.

The resistance and capacitance doesnÃ¢Â€Â™t change when the screw is adjusted.

Any ideas?

unknown component

unkown component

unknown component

asked 1 hour ago

Oleenick

New contributor

1

Looks like an adjustable inductor.
â€“Â Peter Smith
1 hour ago

add a commentÂ |Â

up vote
1
down vote

favorite

I canÃ¢Â€Â™t find or describe what this component looks like. Can anyone help me identify it out of curiosity?

I found it on a PCB for a car alarm, but it has no silk-screen label...

Its has a grub screw that is adjustable. The screw does not seem to make contact with the outer spring but current flows through it no matter.

The resistance and capacitance doesnÃ¢Â€Â™t change when the screw is adjusted.

Any ideas?

unknown component

unkown component

unknown component

asked 1 hour ago

Oleenick

New contributor

1

Looks like an adjustable inductor.
â€“Â Peter Smith
1 hour ago

add a commentÂ |Â

up vote
1
down vote

favorite

I canÃ¢Â€Â™t find or describe what this component looks like. Can anyone help me identify it out of curiosity?

I found it on a PCB for a car alarm, but it has no silk-screen label...

Its has a grub screw that is adjustable. The screw does not seem to make contact with the outer spring but current flows through it no matter.

The resistance and capacitance doesnÃ¢Â€Â™t change when the screw is adjusted.

Any ideas?

unknown component

unkown component

unknown component

asked 1 hour ago

Oleenick

New contributor

I canÃ¢Â€Â™t find or describe what this component looks like. Can anyone help me identify it out of curiosity?

I found it on a PCB for a car alarm, but it has no silk-screen label...

Its has a grub screw that is adjustable. The screw does not seem to make contact with the outer spring but current flows through it no matter.

The resistance and capacitance doesnÃ¢Â€Â™t change when the screw is adjusted.

Any ideas?

unknown component

unkown component

unknown component

pcb components identification through-hole

asked 1 hour ago

Oleenick

New contributor

asked 1 hour ago

Oleenick

New contributor

asked 1 hour ago

Oleenick

New contributor

asked 1 hour ago

Oleenick

asked 1 hour ago

Oleenick

New contributor

Oleenick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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1

Looks like an adjustable inductor.
â€“Â Peter Smith
1 hour ago

add a commentÂ |Â

1

Looks like an adjustable inductor.
â€“Â Peter Smith
1 hour ago

Looks like an adjustable inductor.
â€“Â Peter Smith
1 hour ago

add a commentÂ |Â

2 Answers
2

active

oldest

votes

up vote
2
down vote

That is an adjustable inductor with a brass slug.

Turning the slug out of the coil will raise the inductance.

Turning it in will reduce the inductance.

This is the opposite of the more typical variable inductors that have ferrite cores. Ferrite cores are the black ones like in the examples that Andy aka posted.

Given the low number of loops in the coil and that it uses a brass slug, I'd expect it to be part of a high frequency (probably radio frequency) circuit.

Possibly part of a transmitter or receiver circuit for remote control.

Might instead be part of a capacitive detector circuit that detects intrusion by detecting frequency changes in an oscillator circuit.

edited 34 mins ago

answered 44 mins ago

JRE

18.9k43563

add a commentÂ |Â

up vote
2
down vote

It's an adjustable inductor and probably used at VHF: -

enter image description here

Also available in other colours: -

enter image description here

And in other styles: -

enter image description here

Some with screen cans: -

enter image description here

And some come with an internal capacitor and that makes it sometimes difficult to identify: -

enter image description here

edited 33 mins ago

answered 41 mins ago

Andy aka

232k10172395

add a commentÂ |Â

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

up vote
2
down vote

That is an adjustable inductor with a brass slug.

Turning the slug out of the coil will raise the inductance.

Turning it in will reduce the inductance.

This is the opposite of the more typical variable inductors that have ferrite cores. Ferrite cores are the black ones like in the examples that Andy aka posted.

Given the low number of loops in the coil and that it uses a brass slug, I'd expect it to be part of a high frequency (probably radio frequency) circuit.

Possibly part of a transmitter or receiver circuit for remote control.

Might instead be part of a capacitive detector circuit that detects intrusion by detecting frequency changes in an oscillator circuit.

edited 34 mins ago

answered 44 mins ago

JRE

18.9k43563

add a commentÂ |Â

up vote
2
down vote

That is an adjustable inductor with a brass slug.

Turning the slug out of the coil will raise the inductance.

Turning it in will reduce the inductance.

This is the opposite of the more typical variable inductors that have ferrite cores. Ferrite cores are the black ones like in the examples that Andy aka posted.

Given the low number of loops in the coil and that it uses a brass slug, I'd expect it to be part of a high frequency (probably radio frequency) circuit.

Possibly part of a transmitter or receiver circuit for remote control.

Might instead be part of a capacitive detector circuit that detects intrusion by detecting frequency changes in an oscillator circuit.

edited 34 mins ago

answered 44 mins ago

JRE

18.9k43563

add a commentÂ |Â

up vote
2
down vote

That is an adjustable inductor with a brass slug.

Turning the slug out of the coil will raise the inductance.

Turning it in will reduce the inductance.

This is the opposite of the more typical variable inductors that have ferrite cores. Ferrite cores are the black ones like in the examples that Andy aka posted.

Given the low number of loops in the coil and that it uses a brass slug, I'd expect it to be part of a high frequency (probably radio frequency) circuit.

Possibly part of a transmitter or receiver circuit for remote control.

Might instead be part of a capacitive detector circuit that detects intrusion by detecting frequency changes in an oscillator circuit.

edited 34 mins ago

answered 44 mins ago

JRE

18.9k43563

That is an adjustable inductor with a brass slug.

Turning the slug out of the coil will raise the inductance.

Turning it in will reduce the inductance.

This is the opposite of the more typical variable inductors that have ferrite cores. Ferrite cores are the black ones like in the examples that Andy aka posted.

Given the low number of loops in the coil and that it uses a brass slug, I'd expect it to be part of a high frequency (probably radio frequency) circuit.

Possibly part of a transmitter or receiver circuit for remote control.

Might instead be part of a capacitive detector circuit that detects intrusion by detecting frequency changes in an oscillator circuit.

edited 34 mins ago

answered 44 mins ago

JRE

18.9k43563

edited 34 mins ago

answered 44 mins ago

JRE

18.9k43563

answered 44 mins ago

JRE

18.9k43563

answered 44 mins ago

JRE

18.9k43563

add a commentÂ |Â

up vote
2
down vote

It's an adjustable inductor and probably used at VHF: -

enter image description here

Also available in other colours: -

enter image description here

And in other styles: -

enter image description here

Some with screen cans: -

enter image description here

And some come with an internal capacitor and that makes it sometimes difficult to identify: -

enter image description here

edited 33 mins ago

answered 41 mins ago

Andy aka

232k10172395

add a commentÂ |Â

up vote
2
down vote

It's an adjustable inductor and probably used at VHF: -

enter image description here

Also available in other colours: -

enter image description here

And in other styles: -

enter image description here

Some with screen cans: -

enter image description here

And some come with an internal capacitor and that makes it sometimes difficult to identify: -

enter image description here

edited 33 mins ago

answered 41 mins ago

Andy aka

232k10172395

add a commentÂ |Â

up vote
2
down vote

It's an adjustable inductor and probably used at VHF: -

enter image description here

Also available in other colours: -

enter image description here

And in other styles: -

enter image description here

Some with screen cans: -

enter image description here

And some come with an internal capacitor and that makes it sometimes difficult to identify: -

enter image description here

edited 33 mins ago

answered 41 mins ago

Andy aka

232k10172395

It's an adjustable inductor and probably used at VHF: -

enter image description here

Also available in other colours: -

enter image description here

And in other styles: -

enter image description here

Some with screen cans: -

enter image description here

And some come with an internal capacitor and that makes it sometimes difficult to identify: -

enter image description here

edited 33 mins ago

answered 41 mins ago

Andy aka

232k10172395

edited 33 mins ago

answered 41 mins ago

Andy aka

232k10172395

answered 41 mins ago

Andy aka

232k10172395

answered 41 mins ago

Andy aka

232k10172395

add a commentÂ |Â

Oleenick is a new contributor. Be nice, and check out our Code of Conduct.

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