Subject:
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Re: LEGO light sensor schematic
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 30 Apr 1999 16:54:56 GMT
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Viewed:
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957 times
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In lugnet.robotics, Ralph Hempel writes:
(I wrote)
> > Hmmm. Not to be overly critical, but that circuit wouldn't do a darn
> > thing. We have an OpAmp connected to nothing that is set to oscillate for
[snip]
> Hmmm, Michael is usually pretty careful about what he posts and he
> has just a little experience with this kind of thing :-). In fact, Michael's
> own powered sensors look a lot like this one.
I've done a few myself, but I'll admit I'm not an analog guru.
> From left to right:
>
> The diode pairs that don't do anything are just a bridge rectifier in an
> unusual schematic form.
Except all of the anodes go to the wires out, in 2/3 of the pairs this
is correct, but one of those pairs needs to have the cathodes out or you
don't have a bridge. This has got to be a "typo"
> The no-connect op amp is connected that way to conserve power it is half
> of a pair...
Didn't know that dodge.
[snip]
> the right hand op-amp
> drives the transistor to simulate an impedance which draws current through
> the diodes on the far left of the diagram.
Yeah, I just figured that one out. But, how does that odd photo detection
biasing work? It looks perpetually reverse-biased to me.
[snip]
> Dennis, this is NOT a flame, but please be careful and know what you are
> criticizing before you do it...
Well, it got a response! ;-)
DLC
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Message has 1 Reply:
 | | Re: LEGO light sensor schematic
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| (...) Thanks for your confidence in me, but I didn't say I thought it was the circuit. In fact I can't figure out how it could work this way either. I think probably most of the parts are identified correctly and probably most of the connections. I (...) (25 years ago, 30-Apr-99, to lugnet.robotics)
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Message is in Reply To:
| | RE: LEGO light sensor schematic
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| (...) Hmmm, Michael is usually pretty careful about what he posts and he has just a little experience with this kind of thing :-). In fact, Michael's own powered sensors look a lot like this one. From left to right: The diode pairs that don't do (...) (25 years ago, 30-Apr-99, to lugnet.robotics)
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