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I assume that you are attempting to parse the incoming numeric string of 1 to 3 characters and store it as a single hex byte.
Is this correct?
Are you coding in C or assembler? And for what processor.
You can use a 555 to generate an FM signal to 100% amplitude modulate the laser diode, then use a 567 tone decoder at the receive end to demodulate the FM back to analogue.
Obviously it won't cope with much more than audio in terms of bandwidth because of the simplicity of the approach...
It won't work because the amplifier output voltage still won't get closer than 2V or so to the positive rail.
All the two diodes will do is reduce the output voltage swing so that it no longer includes the negative rail.
The offset voltage just causes an offset on the output voltage caused by...
1) Don't understand what you mean by using a pair of silcon diodes.
Standing the negative rail on a pair of diodes won't get the output voltage any closer to the positive rail.
2) A 1M feedback resistor is ok. I've used 10M and 20M in the past. It may well increase the offset voltage though...
The datasheet for the LM358 is easily found via Google.
Referring to the National Semiconductor datasheet dated October 2005 located at Cornell U (it's the 4th one down in a google search for LM358 datasheet).
If you look at page 3 thereof, you will find the manufacturer's specification for...
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