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10-06-2017, 09:08 AM
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#262
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Bus Geek
Join Date: Oct 2016
Location: Essex, MD
Posts: 3,738
Year: 1999
Coachwork: Blue Bird
Chassis: Blue Bird TC RE 3904, Flat Nose, 40', 277" wh base
Engine: 8.3L Cummins ISC 260hp, MT643, 4.44 rear
Rated Cap: 84 pax or 1 RV; 33,000lbs
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50W at 12Vdc ... 4 amps. Yeah I guess that's about right but holy hell that's big when used to dealing with electronics.
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10-06-2017, 09:40 AM
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#263
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Bus Geek
Join Date: May 2009
Location: Columbus Ohio
Posts: 18,848
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
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Quote:
Originally Posted by Brewerbob
50W at 12Vdc ... 4 amps. Yeah I guess that's about right but holy hell that's big when used to dealing with electronics.
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no TRIAC wave chopping there.. 48 watt resistors LOL.. not like the typical 1/4 or 1/8 watt stuff we use in electronics circuits
-Christopher
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10-06-2017, 09:47 AM
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#264
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Bus Geek
Join Date: Oct 2016
Location: Essex, MD
Posts: 3,738
Year: 1999
Coachwork: Blue Bird
Chassis: Blue Bird TC RE 3904, Flat Nose, 40', 277" wh base
Engine: 8.3L Cummins ISC 260hp, MT643, 4.44 rear
Rated Cap: 84 pax or 1 RV; 33,000lbs
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Quote:
Originally Posted by cadillackid
no TRIAC wave chopping there.. 48 watt resistors LOL.. not like the typical 1/4 or 1/8 watt stuff we use in electronics circuits
-Christopher
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Wave chopping??? Resistors don't do that anyway and this is DC so... . Yeah the 1/4 ~ 1 W were BIG. My '72 Duster had a wire wound 50W ballast resistor on it. As far as I know, that was as "electronic" as that car was. Carb, no ABS, ... well there was the voltage regulator with something for diodes in it. Separate from the alternator in those days.
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10-06-2017, 09:56 AM
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#265
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Bus Geek
Join Date: May 2009
Location: Columbus Ohio
Posts: 18,848
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
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Quote:
Originally Posted by Brewerbob
Wave chopping??? Resistors don't do that anyway and this is DC so... . Yeah the 1/4 ~ 1 W were BIG. My '72 Duster had a wire wound 50W ballast resistor on it. As far as I know, that was as "electronic" as that car was. Carb, no ABS, ... well there was the voltage regulator with something for diodes in it. Separate from the alternator in those days.
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thats why I said *NO* wave chopping here because these are resistors... and its DC...
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10-06-2017, 10:02 AM
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#266
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Bus Geek
Join Date: Oct 2016
Location: Essex, MD
Posts: 3,738
Year: 1999
Coachwork: Blue Bird
Chassis: Blue Bird TC RE 3904, Flat Nose, 40', 277" wh base
Engine: 8.3L Cummins ISC 260hp, MT643, 4.44 rear
Rated Cap: 84 pax or 1 RV; 33,000lbs
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Quote:
Originally Posted by cadillackid
thats why I said *NO* wave chopping here because these are resistors... and its DC...
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Wasn't sure why TRIAC was even mentioned; are they cheaper/easier to find? Ballast resistor should be the cheaper/easier route but I haven't tried buying electronic parts in forever.
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10-06-2017, 10:12 AM
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#267
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Bus Geek
Join Date: May 2009
Location: Columbus Ohio
Posts: 18,848
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
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TRIAC is used in AC circuits and chops the wave.. in AC circuits they dont absorb the energy like a ballast resistor does in a DC circuit.. it was an off-the-cuff comment.. they are quite small.. the 600-1000 watt dimmers with the paddles in most newer homes are TRIAC based and dont require huge space and only small heat sinks..
-Christopher
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10-06-2017, 10:45 AM
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#268
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Traveling
Join Date: Nov 2015
Location: Midwest
Posts: 2,573
Year: 2003
Coachwork: BlueBird
Chassis: TC2000
Engine: 5.9L Cummins
Rated Cap: '00
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Quote:
Originally Posted by cadillackid
no TRIAC wave chopping there.. 48 watt resistors LOL.. not like the typical 1/4 or 1/8 watt stuff we use in electronics circuits
-Christopher
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Yeah, overkill, but $6/ pair. I bet them LED's need the heatsink for dissipation.
I like this gizmo. Resistance is futile.
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10-06-2017, 11:09 AM
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#269
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Bus Geek
Join Date: Sep 2017
Location: Owasso, OK
Posts: 2,627
Year: 1999
Coachwork: Thomas
Chassis: Saf-T-Liner MVP ER
Engine: Cummins 6CTA8.3 Mechanical MD3060
Rated Cap: 46 Coach Seats, 40 foot
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Quote:
Originally Posted by Brewerbob
50W at 12Vdc ... 4 amps. Yeah I guess that's about right but holy hell that's big when used to dealing with electronics.
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Generally they only need to be rated the same resistance as the bulb they are replacing .. so around 20W.
superbrightleds.com has decent examples. Too high a load could put a strain on the flasher unit.
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