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Microscope 2.5-D Lighting(2N2222)

2014-12-10 02:41  
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This article briefly describes the Microscope 2.5-D Lighting (2N2222). This principle is easy to understand, but also very practical. Depth understanding of circuit elements, can be more effective to grasp this principle. Do you know the circuit, for example, can understand and buy these components: 2N2222 .

Interesting, surprising as well as scientifically useful visual effects can be obtained by employing coloredLEDs instead of the normal lamp ?tted in the lighting assembly in a microscope base. Of course, the lamp can be simply replaced by a whiteLEDwith appropriate changes in the supply current/voltage etc., but it is more interesting to have three colors available — here, red, green and orange (amber) which are individually adjustable for intensity. The dashed line aroundLEDs D2, D3 and D4 indicates that they are ?tted in a 10 mm long section of 1-inch plastic (PVC) pipe.

Figure:1

Figure 1 

The 5-mm holes for theLEDs are drilled at an angle so that theLEDbeams are pointed downwards at the center of the holder. As shown in the photograph, as small piece of veroboard can be ?tted under the ring, with a 1-inch hole in it so that the centre of the ring remains open, allowing the assembly to be placed on top of the glass specimen carrier. ThePCB, which is held secured to the ring by theLEDwires, allows wires to be run between the lighting assembly and the driver electronics ?tted in the microscope base.

Figure:1 Circuit diagram

Figure 2 Circuit diagram

The whiteLED, D5, takes the place of the (6-V) lamp in the lamp holder, and is connected to the driver circuit by wires. The potentiometers P1, P2 and P3 allow the intensity of each color to be individually adjusted, while P5 acts as the master intensity control. Space allowing, the pots may be ?tted in the microscope base. If there are problems with re?ections in the ring, paint the inside black. Finally, in most microscopes there is a need for strong lighting which pleads for high-intensityLEDs to be applied in this circuit.

 

 


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