Author Topic: Suggested circuits for photodiode/transistor to audio line-level?  (Read 1918 times)

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Offline lpc32

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Can anyone suggest a simple circuit for hooking a photodiode/transistor to an audio line-level or microphone input?
 

Online tggzzz

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Re: Suggested circuits for photodiode/transistor to audio line-level?
« Reply #1 on: December 17, 2014, 03:27:46 pm »
Can anyone suggest a simple circuit for hooking a photodiode/transistor to an audio line-level or microphone input?

Connect all leads to both the signal connectorand the ground.

I have no idea whether that will do what you want - because you haven't bothered to state what you are trying to do!
There are lies, damned lies, statistics - and ADC/DAC specs.
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Offline lpc32

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Re: Suggested circuits for photodiode/transistor to audio line-level?
« Reply #2 on: December 17, 2014, 04:25:32 pm »
Light intensity to voltage in line-level/microphone range. What else could it be?

I want a quick way to look at some IR remote signals using parts I have handy. A photodiode or phototransistor plus the soundcard's ADC seem the simplest.
 

Online tggzzz

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Re: Suggested circuits for photodiode/transistor to audio line-level?
« Reply #3 on: December 17, 2014, 04:36:08 pm »
Light intensity to voltage in line-level/microphone range. What else could it be?

With a little imagination and a few moments thought, I could think of several.
So, PSU voltage, illumination range, linearity, accuracy, logarithmic or linear, frequency?

Quote
I want a quick way to look at some IR remote signals using parts I have handy. A photodiode or phototransistor plus the soundcard's ADC seem the simplest.

Looks like you've already determined your goole search terms.
There are lies, damned lies, statistics - and ADC/DAC specs.
Glider pilot's aphorism: "there is no substitute for span". Retort: "There is a substitute: skill+imagination. But you can buy span".
Having fun doing more, with less
 

Offline lpc32

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Re: Suggested circuits for photodiode/transistor to audio line-level?
« Reply #4 on: December 18, 2014, 02:37:40 pm »
Couldn't find something promising, particularly if the first criteria is no chance of damage to the sound input.
 


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