IR Communication by using PT2248/PT2249A

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DonL

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Good catch Don. Base polarity is an important thing. So what do they call that output, a cascaded emitter follower or something like that?

No a cascaded emitter follower uses the same type of transistor, Typically 2 NPNs, I do believe.

It is a complementary pair.

I personally do not like to direct couple transistors, I would have put a 1K resistor on the base of Q2.
But that is a mater of personal preference.

With a limiting resistor at least if one transistor gos bad, It don't take out the other.
Then you have to add more smoke, because it all gets let out. lol


I hope You are having a enjoyable Weekend.


DonL
 
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BobL43

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Just finished cutting the grass, so now its time to cool off.

Factory smoke is hard to find these days!
 

DonL

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I wonder what ever happened to this IR system ?

Did you get it working munhann ?


DonL
 

PipeInspection

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Realize this post is old. I'm new here and wondering if anyone has plans to Built a 512 Hz Transmitter. I found plans to build a Transmitter Tracker, but not sure how to turn it down to 512.

512 is AM correct?

Thanks in advance,

Paul
 

DonL

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Realize this post is old. I'm new here and wondering if anyone has plans to Built a 512 Hz Transmitter. I found plans to build a Transmitter Tracker, but not sure how to turn it down to 512.

512 is AM correct?

Thanks in advance,

Paul

Depending on the bandwidth it can be am/fm/cw/ssb or whatever you design it for. I would think CW is the norm, if you plan to use it as a Pipe locator.

512 HZ is in the Audio range , so why not just use a audio generator / or a 512 HZ tape recording and a speaker ?
 
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