@KarlDL posted:I measured a stall current of 2A on an AM GP35, so I'm surprised at your number unless it's for more than one powered diesel.
NMRRC's S gauge inventory doesn't include any Legacy S gauge. It does not surprise me that such engines have voltage requirements similar to their O gauge counterparts. For us, not having any Legacy engines nor intending to buy any, we can keep the voltage lower and avoid the regulator issue.
As much as i don't like linear regulators ahead of Blunami cards, that may be the easiest and most compact approach for S engines, if compatibility of track voltage with Legacy is required, given the likely current drawn.
Karl I'm curious, why don't you like to use the linear regulators? Are they somehow detrimental to the Blunami card, or to signal reception? If not, why would the card care whether straight-line DC comes from a battery, or rectified and smoothed track voltage?
Also- if you don't need to pull stumps with a single unit, replacing a rubber-tired wheelset with a metal wheelset might allow the loco to spin its wheels when heavily loaded, instead of stalling the motor. This may reduce the peak current draw in actual service, and allow you to get away with a lower amp rating.
