do you really want to use an wall wart with AC output?
isn’t the peak voltage from AC Vac/0.7?
Doesn’t a wall wart transformer wired to the PCB do the same thing as the original internal transformer, just at a reduced voltage? Here is the specs for the wall wart transformers I was looking at:
https://www.mouser.com/ProductDetail/546-BPD2E
The fixed accesories AC output on my throttle from the internal transformer is 18.5V AC. The peak DC output is 15.5V after circuit losses. By switching it to 12V AC input the accessories output would be 12V AC and the peak DC output should be somewhere around 9V, correct? I never need more than about 6V to the track, so this in theory should utilize more range on the throttle sweep.
so this is to replace the transformer in the MRC throttle, not supply your external throttle board?
if 15.5V is 83% of 18.5V, then replacing the transformer with a 10.8V transformer should result in a ~9V DC output.
Only if there is a filter capacitor, which MRC doesn’t use (probably on purpose, to get pulsating DC which is better at starting DC motors.). The capacitor allows the rectified DC to pump to peak, instead of RMS. Without a cap, RMS is about all you get. Less 2 diode drops in the rectifier.
–Randy
certainly if no current is being drawn, otherwise there is more output than input power