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Spectra-Physics Model 133 HeNe Laser

Spectra-Physics Model 133 HeNe Laser

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Spectra-Physics Model 133 HeNe Laser Power Supply (SP-133) c/w Model 233 Exciter.

This is a 1 mW self contained HeNe laser. The power supply is very simple with no regulation - just a doubler for the operating voltage and a 3 stage multiplier for the starting voltage. The very large total ballast resistance of 272K (4 times 68K) stabilizes the HeNe tube current.

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