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Help with lamp orientation
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abelovesfun



Joined: Dec 17, 2012
Posts: 18
Location: Portland, OR

PostPosted: Thu Jun 26, 2014 6:26 pm    Post subject: Help with lamp orientation Reply with quote  Mark this post and the followings unread

Hello,

I am trying to use an old transistor checker chassis as the enclosure for an FX pedal, and I'm hoping to use the lamp as the LED.

Unfortunately both original cables are green, there's no part number I can find on the lamp, and I haven't been able to dig up a schematic for the transistor checker.

Any clues as to which terminal is positive and which is negative?

The transistor checker ran on a D cell, so I assume it's a DC circuit.

Thanks!
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Blue Hell
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Joined: Apr 03, 2004
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PostPosted: Fri Jun 27, 2014 3:09 am    Post subject: Reply with quote  Mark this post and the followings unread

When it is a lamp it has no polarity ...

When it is an LED it will just not function when connected wrongly - as in that it wont vaporize.

When you have a multimeter with diode test functionality you can easily check it.

When you have resistance measurement its a bit less easy, but you can check resistance which for an LED is different depending on connection polarity ... but ... some resistance meters have reversed polarity where the red one will be the negative terminal then .. so you need to find out about that.

Meanwhile, when resistance does not depend on connection direction, you'll know its a lamp and not an LED.

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