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KMID : 0380319740130000025
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Journal of Korean Research Institute for Better Living
1974 Volume.13 No. 0 p.25 ~ p.35
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A Study on the Design and Munufacture of Amplification Steps for Moire´ Interferometer
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Abstract
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When one feeble light of Moire´ fringe injected on a phototube is D.C. 25mV. D.C. 25mV is weak in operation for the Digital counter and osciloscope.
In this paper, the design and manufacture of D.C. amplification circuit and Schmitt circuit are included.
As the circuit of amplification, I make use of Fair-child Integrated citcuit μA709. Furthermore, the equillibrium of Emitter Bias and Voltage gain have regard for the design of D.C. Amplifier.
Schmitt trigger circuit put to use the NPN type transistor 2N2219, C423F.
The results of the experiment showed that the amplification ratio is 40db, the out voltage of Schmitt circuit is Min. 4.4V∼Max.5.2V.
Therefore, the limits of the hysteresis range is 0.8V, then a sine-wave input will result in a Square-wave output.
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