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6th February 2019, 12:04 #1Member level 3
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IR photo transistor replacement, help needed
hi, I wanna replace the photo transistor of the below circuit with the common ir receiver (shown in figure 2)
so whats the new configuration ? :confused:
Attachment 150987
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6th February 2019, 14:02 #2Advanced Member level 5
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Re: IR photo transistor replacement, help needed
Hi,
One of the photos hasn't loaded correctly.
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6th February 2019, 18:49 #3Member level 3
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Re: IR photo transistor replacement, help needed
there it is
Originally Posted by d123
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6th February 2019, 21:04 #4Super Moderator
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Re: IR photo transistor replacement, help needed
If figure 2 is the one in post #1, you can't do it.
The schematic shows a phototransistor that conducts when IR light falls on it so its collector voltage drops.
The black device is a photodiode, it is normally used to produce a tiny voltage when light falls on it or in a mode where it passes a tiny current.
You would need extra circuitry and a degree of experimentation to swap to the other device.
Brian.PLEASE - no friends requests or private emails, I simply don't have time to reply to them all.
It's better to share your questions and answers on Edaboard so we can all benefit from each others experiences.
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