Lab equipment/NE43500

NE43500

Description

NE43500 is a differential photocurrent amplifier that outputs both photocurrent difference and sum. With the sum output. The reason to have the sum output is to cancel the laser power noise when the polarimeter is misbalanced. The polarization rotation angle $\varphi$ can be found as:

${\frac {\Delta }{\Sigma }}=\tan \varphi$,

Where $\Delta$ is the difference and $\Sigma$ is the sum of photocurrents.

Schematics

• File:20161003135550907.pdf
• File:20161003135550907.pdf

Circuit boards

We have several PCBs of this device. The boards are using tiny components, including surface mount 0204 elements. This makes the boards hard to handle and impossible to modify. We need to redesign the PCBs so that they have more reasonable size.

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  Newer version

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  Older version

Problems

Zack mentioned that this board doesn't have enough gain and that it exhibited some drifts.