After seeking advice from several participants in the forum and from a representative at MRC, I soldered a 10 ohm resistor in series with the speaker in the MRC sound decoder for the Atlas S-2. After two hours' operation, all seems fine. I did not have to adjust the CV settings at all but now they are down to an acceptable level. Thanks for the help. I hope I got one of the 50% of MRC decoders that keep working since the S-2 sounds good and runs well now. In any case, this decoder is my first--and last--MRC decoder. For slow speed control it is hard to surpass LokSound decoders!
John
Mebane, NC
Do you happen to remember what the wattage of the resistor was? And can you confirm that the resistor was indeed 10 ohm as opposed to, say, 100 or 1000 ohm?
Thanks
maxman Do you happen to remember what the wattage of the resistor was? And can you confirm that the resistor was indeed 10 ohm as opposed to, say, 100 or 1000 ohm? Thanks
Yes, it was indeed a 10 ohm 1/4 watt ceramic resistor from Radio Shack. I never just take it for granted that the color code on a resistor is correct. I always use an ohm-meter to make sure. I clipped one speaker lead and used thin wire from the resistor (I clipped the leads on the resistor short as well) to "splice" the speaker wire and then mounted the resistor on the "shelf" where the "fireman" would sit. It is invisible from the cab window, except for from the wire to the speaker. Using black wire helps disguise it.
Thanks for the input. The information is appreciated.
Regards.