LEGO TECHNIC : 15180


Technic / 15180	15179 \| 15181

Subject:	Help with converting voltage on circuit board
Newsgroups:	lugnet.robotics, lugnet.technic
Date:	Fri, 7 Apr 2006 22:51:30 GMT
Viewed:	2803 times

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 are next to the output connections. Can anyone confirm or lead me in the right direction? http://homepage.mac.com/dustinmj/PhotoAlbum15.html Thanks! Dustin

Message has 4 Replies:

		Re: Help with converting voltage on circuit board
(...) I am not an EE either but I can see at least 2 things that look like voltage regulators. (19 years ago, 7-Apr-06, to lugnet.robotics, lugnet.technic)

		Re: Help with converting voltage on circuit board
(...) 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 (...) (19 years ago, 8-Apr-06, to lugnet.robotics, lugnet.technic)

		Re: Help with converting voltage on circuit board
(...) 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 (...) (19 years ago, 8-Apr-06, to lugnet.robotics, lugnet.technic)

		Re: Help with converting voltage on circuit board
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. (...) (19 years ago, 8-Apr-06, to lugnet.robotics, lugnet.technic)

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