I have been working on this project at the request of some of my classmates at the university and is called the Opto listener.
The device is intended to "listen" light via photodiode. We study chemistry and we thought this project could be great for our science expo on july.
In order to make the Optolistener i took some ideas from tom petruzzellis book (http://www.mhprofessional.com/product.php?cat=113&isbn=0071470360). The design is very simple and can be seen on the attached file (sorry for the image quality, i didn't had time to make the schematic on the computer).
Based on instructions in the book and the schematic i managed to make the device to work, but the problem is, the optolistener doesn't work if the photodiode's cathode is connected to 9V supply anode as stated on the schematic.
What can be the problem?. Bad design?.
Any ideas?. Help and assistance will be appreciated.
The device is intended to "listen" light via photodiode. We study chemistry and we thought this project could be great for our science expo on july.
In order to make the Optolistener i took some ideas from tom petruzzellis book (http://www.mhprofessional.com/product.php?cat=113&isbn=0071470360). The design is very simple and can be seen on the attached file (sorry for the image quality, i didn't had time to make the schematic on the computer).
Based on instructions in the book and the schematic i managed to make the device to work, but the problem is, the optolistener doesn't work if the photodiode's cathode is connected to 9V supply anode as stated on the schematic.
What can be the problem?. Bad design?.
Any ideas?. Help and assistance will be appreciated.
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