简单DIY制作——分光计（二）
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发表于 5/27/2011 11:20:44 PM
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Step 1Sourcing the parts
Most parts are fairly easy to obtain.
You will need:
For the stepper circuit:
For the detection and amplification circuit:
General parts
You will need:
For the stepper circuit:
- A stepper motor
- an Arduino (or a stepper driver circuit)
- 2x 10k resistor
- 2x 1k resistor
- L293D H-Bridge
- 2x NPN transistor (I used the BC547A)
- A power supply
For the detection and amplification circuit:
- an op-amp (e.g. TL081)
- LDR
- 1x 2k2 resistor
- 1x 4k7 resistor
- 1x LED
General parts
- A base (some kind of board such as a cutting board to mount everything on)
- Cuvette
- Diffraction grating, CD or DVD
- Lightbulb and / or white LED
- Metal or cardboard plaques
- Some connectors
- Some pushbuttons
Step 2Bring on the photons!
Light source
First of all, we need a light source. Some possibilities include a small lightbulb or white LED. I installed both, so I could experimentally decide which one was best suited for my purposes.
To construct the light source assembly, find some piece of plastic (or any other material, for that matter) and glue a bulb socket to it.
For the LED, find some kind of connector (I cut off part of and old IDE-connector) and solder some wires to it. Also include a 2k2 resistor in series with the LED to limit the current.
Glue the LED-connector somewhere near the bulb, and put in a LED.
