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Old 02-23-2012, 08:39 PM   #1
old464
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Cool Resistors to use in 70's steam engine on smoke unit

hey guys. saw the diagram on the sound of steam board. shows a 220 ohm resistor on the smoke unit to chuff the tender.

Can I get these at radio shack? its a larger brown type. Im going to get ones for my crescent limited, my jersey central blue one, one of my 442 black engines.

I tested the tenders and all are working good off a "good" engine. so its the resistor on the smoke unit.

thanks
Chris
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Old 02-23-2012, 08:49 PM   #2
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You should be able to get a 220 ohm resistor almost anywhere, including RS. Exactly how big is the resistor? "larger brown type" isn't must of a description, how about some measurements of diameter and length? What kind of marking, standard color codes?
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Old 02-23-2012, 11:03 PM   #3
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220 ohm is a common size. RS may have it or they may have it in a smaller wattage. The larger resistors will dissipate more power. Small resistors are usually 1/10 or 1/8 watt. Larger ones go from 1/4 watt to 1/2 to 1 to 2 watts. If the resistor is too small, it will emit smoke.
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Old 02-24-2012, 12:04 AM   #4
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You hit a sore spot. The resistor is 1/2 watt. SOmehow I found out to use the 220k resistor the 220 has more statis between the chuffs. This was my second video.




The smoke unit that has the acuator has 180 ohms,the difference between that and 220 is negligible. So all I can say is test it out. The diagram says 220 ohms also but I wonder if it is a mistake.
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Old 02-24-2012, 06:42 AM   #5
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Remembering back 35 years, a friend of mine who is also an engineer and a train collector, said the SoS unit makes the chuff by taking the junction noise from a transistor and amplifying it. I think if you look at the circuit you will see a transistor with the base-emitter junction forward biased and nothing connected to the collector. I think it is this junction that makes the noise.
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Old 02-24-2012, 06:52 AM   #6
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So far I have found no other source of info. The higher the resistance the quieter the background noise . The chuff noise is fine.
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Old 02-24-2012, 09:28 AM   #7
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I know it's certainly noise, never looked into the details on the one I fixed. I just replaced a cap and gave it back.
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Old 02-24-2012, 11:24 AM   #8
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The resistor is in the smoke assy. The one that Jim gave is 180 ohms brown grey brown


,
Maybe it is higher than 1/2 watt, I used the 1/2 watt.
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Old 02-24-2012, 11:26 AM   #9
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What's a resistor there for? Could that be for the light bulb on the front? I can't imagine what a resistor of that value would be doing in the actual smoke circuit.
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Old 02-24-2012, 12:40 PM   #10
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The resistor is the key to the works. It stops the continual noise/chuff. When bypased you get the chuff.



On my video the 220k quieted the noise until bypassed but the 220 didn't and noise leaked continously.
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