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(...) Thanks Dustin, those will help. I am inclined to agree with Philippe Hurbaine on the regulator. It is also obvious that it can take AC from the full wave rectifier near the power port. In answer to Davids question about the 4v connector (using (...) (18 years ago, 8-Apr-06, to lugnet.robotics, lugnet.technic)
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| | Re: Help with converting voltage on circuit board
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(...) The BDX34 transistor + toroidal inductor above + LM339 comparator probably compose a switching regulator efficiently converting 13V input power to 4.5V for the outputs. Philo (18 years ago, 8-Apr-06, to lugnet.robotics, lugnet.technic)
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| | Re: Help with converting voltage on circuit board
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I've taken some more detailed pictures of the circuit and the reverse side. (URL) through the manual, connections 6 and 7 are for sensors and connections 0-5 are for output (4V as labled on the cover), but you only can turn the circuit on or off. (...) (18 years ago, 8-Apr-06, to lugnet.robotics, lugnet.technic)
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| | Re: Help with converting voltage on circuit board
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(...) Hi Dustin, I am an EE. Before I give you some advice, I need a bit more information about 9750 (I have never seen one in person): - I see a power jack: I assume this powers the electronic circuit, not the loads, right? What voltage is applied (...) (18 years ago, 8-Apr-06, to lugnet.robotics, lugnet.technic)
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| | Re: Help with converting voltage on circuit board
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(...) Wow - I remember those, we used them at school. Now why is it that Peeron do not have an entry for it under 9750? Those are also some big old capacitors, I would be inclined to check out their ESR (a rating of their health if you like) before (...) (18 years ago, 8-Apr-06, to lugnet.robotics, lugnet.technic)
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| | Re: Help with converting voltage on circuit board
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(...) I am not an EE either but I can see at least 2 things that look like voltage regulators. (18 years ago, 7-Apr-06, to lugnet.robotics, lugnet.technic)
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| | Help with converting voltage on circuit board
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I'd like to try to convert the output of the voltage on a 9750 from 4V to 12V (to control 12V trains :). I've taken a photo of the internal circuit board - my rudimentary EE knowledge leads me to be believe I need to swap out the transistors that (...) (18 years ago, 7-Apr-06, to lugnet.robotics, lugnet.technic)
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| | Re: 3747 - 2006 new variant
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(...) No. That does not work. I've been able to find only one functional difference (improvement) you can clearly see here : (URL) That square limit how deep, Technic bushes for instance, can be "studded"; preventing it also to be "angled". (...) (19 years ago, 7-Apr-06, to lugnet.parts, lugnet.technic, FTX)
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| | Body for the 8860 car chassis found on Brickshelf!
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(URL) looks awesome, also looks like he only used bricks from 1980 or earlier. (19 years ago, 1-Apr-06, to lugnet.technic)
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| | Boeing 737-400 Minifig Scale
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(...) Thanks Nathan, Sorry guys, I wanted to introduce the plane to everybody earlier, but up until now I didn’t have posting rights yet. So with no further adieu, I present to you my latest MOC, and sixth Technic Airplane... My personal greatest: (...) (19 years ago, 1-Apr-06, to lugnet.technic, lugnet.town, lugnet.space) !
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