Hi everyone on the forum,
I am currently building a electro-mechanical TV and need help in designing an electronic circuit for that purpose. Here is a description of what I am trying to do:
I need to design an analog electronic circuit that can drive a bright white LED from a photo diode. By that I mean that the LED should be able to change its brightness according to the brightness induced to the photo diode. This should work with a maximum frequency of 2 MHz. The circuit should also include a potentiometer to gamma correct the signal.
I need this circuit for a mechanical television system I am building, as described here: http://gebseng.com/11_big_paul/
Since this system (the spinning Nipkow Disk) blocks out 99,9886 percent (sic!) of the available light, the photo diode needs to be very light sensitive, and the LED needs to be very bright.
The photo diode should be used in "reverse bias" mode to be as sensitive as possible. Probably the photo diode could be an "Avalanche" type to be more sensitive.
Here is an example of a photo diode we could use:
https://www.digikey.com/products/en?keywords=SD100-12-22-021-ND
Here is an example of a bright 28W LED we could use:
https://www.digikey.com/product-det...A-00-0000-0D0BN240E-SB01/1672-1050-ND/6012737
If you have a design for a circuuit that could be re-purposed for my task, it would be great to hear from you!
thanks,
geb
I am currently building a electro-mechanical TV and need help in designing an electronic circuit for that purpose. Here is a description of what I am trying to do:
I need to design an analog electronic circuit that can drive a bright white LED from a photo diode. By that I mean that the LED should be able to change its brightness according to the brightness induced to the photo diode. This should work with a maximum frequency of 2 MHz. The circuit should also include a potentiometer to gamma correct the signal.
I need this circuit for a mechanical television system I am building, as described here: http://gebseng.com/11_big_paul/
Since this system (the spinning Nipkow Disk) blocks out 99,9886 percent (sic!) of the available light, the photo diode needs to be very light sensitive, and the LED needs to be very bright.
The photo diode should be used in "reverse bias" mode to be as sensitive as possible. Probably the photo diode could be an "Avalanche" type to be more sensitive.
Here is an example of a photo diode we could use:
https://www.digikey.com/products/en?keywords=SD100-12-22-021-ND
Here is an example of a bright 28W LED we could use:
https://www.digikey.com/product-det...A-00-0000-0D0BN240E-SB01/1672-1050-ND/6012737
If you have a design for a circuuit that could be re-purposed for my task, it would be great to hear from you!
thanks,
geb