Robotics : 25780


Robotics / 25780	25779 \| 25781

Subject:	Re: Help with converting voltage on circuit board
Newsgroups:	lugnet.robotics, lugnet.technic
Date:	Sat, 8 Apr 2006 00:45:50 GMT
Viewed:	6235 times

I've taken some more detailed pictures of the circuit and the reverse side. http://homepage.mac.com/dustinmj/PhotoAlbum16.html Reading 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. Connections A,B,C use the pairs of 0-1,2-3, and 4-5 to provide on, off and direction. The input from the wall transformer provides 13.8V AC 1.25 amps. Dustin

Message has 2 Replies:

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

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

Message is in Reply To:

		Help with converting voltage on circuit board
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 (...) (19 years ago, 7-Apr-06, to lugnet.robotics, lugnet.technic)

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