Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
i want to build an optical grey shaft encoder i understand how to biuld most of it but was wondering if there is an advantage in using phototransistors over photodiodes? if so how would you go about wiring up a phototransistor as i have never used one before?
Phototransistors are more sensitive but slower, so it partly depends upon how fast your shaft rotates.
You connect a phototransistor similar to a photodiode with plus on the collector and minus on the emitter. Some have the base connection also available which can be used to adjust the sensitivity and speed by connecting a resistor from the base to emitter.
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