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> When I installed my first decoders (Digitrax DN121), I omitted
> the capacitors, figuring if the buzzing was annoying, I could always
> add them later. As it turns out, there is a little buzzing at low
> speeds, but it is not annoying to me (YMMV). In fact, for my
> diesels, it sounds like a low grumbling which reminds me of the low
> "thrumming" you get as the prototype leaves the yard. I just
> installed a DZ143, and it buzzes at about half the volume of the
> DN121s.
I don't install them either, and I have done something like 30 motors so far.
> If you are referring to Tom's L-Gauge page, the resistor is
> used for the headlight to lower the ~12V DCC voltage to 9V
> for use with a standard Lego lamp brick. I didn't need to
> use this resistor since the RCX is already putting out about
> 9V.
True, but ONLY if you are just going to use the RCX as a output. You can dial
the voltage that DB100's (and most other Digitrax) boosters put out to a exact
voltage as well, however it is something I haven't worried about yet. For the
most part, this does limit the range of useable speed with a unprogrammed
decoder to the lower 1/2 of the scale.
> I did however, add a diode in parallel with the lamp output
> in case I decide to run an inductive load such as a
> relay or motor on the lamp output.
I have gotten away with the lego motors so far. However, YMMV :) and no, I
don't put diodes on them.
James P
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Message has 1 Reply:
 | | Re: DCC for the RCX
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| (...) I'm no electronics engineer by any stretch-- A diode, iirc, allows DC current to 'flow thru' in only one direction. What would a diode do across the output on the top of the train motor? And why would one be good for 'inductive' loads such as (...) (21 years ago, 29-May-03, to lugnet.robotics.rcx, lugnet.trains)
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Message is in Reply To:
| | Re: DCC for the RCX
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| (...) I (...) resistors (...) goes (...) run (...) the (...) isn't (...) reduce the (...) David, When I installed my first decoders (Digitrax DN121), I omitted the capacitors, figuring if the buzzing was annoying, I could always add them later. As (...) (21 years ago, 28-May-03, to lugnet.robotics.rcx, lugnet.trains)
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