Subject:
|
Solar cells and caps: lego part #s
|
Newsgroups:
|
lugnet.robotics
|
Date:
|
Tue, 27 Mar 2001 15:25:26 GMT
|
Original-From:
|
John Barnes <barnes@sensors.^avoidspam^com>
|
Viewed:
|
653 times
|
| |
|
|
This whole Lego capacitor thing strikes me as somewhat intriguing.
The super-caps, which are doubtless used, absolutely cannot be charged
backwards, they have to have the correct polarity. And all the Lego
electrical "stuff" like the RCX sensors, have been carefully designed to
be insensitive to polarity. So;
I assume the Lego capacitor has some kind of bridge rectifier in it to
ensure that the capacitor component itself is charged with the correct
polarity. So;
How do they get the power back out? Is there a seperate in and out
connector? Is there some very clever circuitry which "remebers" which
way the inputs were connected so it will discharge back out of the
input terminals with the correct output polarity?
Maybe someone who actually owns one of these could fill in the blanks.
Inquiring minds .....
JB
|
|
Message has 2 Replies:
 | | Re: Solar cells and caps: lego part #s
|
| (...) The capacitor is very much polarity-sensitive. It has +/- polarity indicators on either side of the standard 2x2 9V terminal, as does the solar cell, and it will not work if the polarity is reversed. (24 years ago, 27-Mar-01, to lugnet.robotics)
| | | lego cap, polarity, etc
|
| (...) I don't have one, but can make some guesses. A bridge only works with an AC input - it can't correct the polarity of a DC input. So the Lego cap either has an AC input possibly through a bridge or a DC input which is the correct polarity by (...) (24 years ago, 27-Mar-01, to lugnet.robotics)
|
15 Messages in This Thread:
 
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
