Re: Terminating bus ends

Mark Gurries
 

Sorry...typo...39 ohm series...somehow I must have hit the zero button
right before I hit the send button.

Mark, shouldn't that read .....1/2W 390Ohm resistors in "parallel"?
I thought wattages are additive in parallel and resistance is
additive in series? Or am I all mixed up?
Ken

--- In WiringForDCC@..., Mark Gurries <gurriesm@c...>
wrote:

You can always use a series string of resistors to spread out the
heat.
Example: you could use 3 1/2W 39Ohm resistors in series. That
will give
you a long 117 ohm 1.5W resistor. The resistance accuracy is not
the
critical.

--- In WiringForDCC@..., "beckemeier53221"
<MBeckemeier@w...> wrote:
Thanks for the info Mike. I had already decided to use a 2 watt,
now I'll probably go with the 3 as you used.

Thanks for the info. Ken

I can attest to the resistors getting toasty. I had to install
over 90
of them on our club layout. Even the 1 watt resistor got quite
hot.

I eventually went with a 3 watt 130 ohm resistor and a 0.1uf 50
V
Capacitor. It really cleaned up the signal nice, and is not as
hot
to
the touch.

Capacitor:
Newark Part Number: 08B5602 Manufacturer Part Number:
C317C104M5U5CA.
Resistor:
Newark Part Number: 94C3740 Manufacturer Part Number :
5093NW130R0J

Mike Beckemeier






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Best Regards,

Mark Gurries
Linear Technology
Power Supply & Battery Charger Applications Engineer/Manager
---------------------------------------------------------
Model Railroad Club and NMRA DCC presentations are at:
http://www.siliconvalleylines.com/index.html
--------------------------------------------------------
Audio Enthusiast (Love SAE equipment)
http://members.ebay.com/aboutme/gurriesm/
----------------------------------------------------------






http://www.WiringForDCC.com
Yahoo! Groups Links





Best Regards,

Mark Gurries
Linear Technology
Power Supply & Battery Charger Applications Engineer/Manager
---------------------------------------------------------
Model Railroad Club and NMRA DCC presentations are at:
http://www.siliconvalleylines.com/index.html
--------------------------------------------------------
Audio Enthusiast (Love SAE equipment)
http://members.ebay.com/aboutme/gurriesm/
----------------------------------------------------------

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