Hi to all I have converted an old Atlas GP7 to DCC. It turns out that I did something similar to a conversion by Sumner. I machined away both ends of the frame in a drill press using a heavy vise and a Dremel end mill bit. I printed a backcase for an 8x15mm OWS speaker. I put together two 0402 white LEDs with 3.3kOhm SMD resistors, then connected them to the + and - contact pads on an ESU58923 decoder. I removed the unneeded wires and doubled the +V wire to connect both LEDs. The yellow and white wires connected the front and rear ground legs on the LEDs. The speaker is in the "front"; the decoder is in the "rear". I machined a groove for the Red wire along the side of the frame, and soldered the wire to the bronze contact strip. The black wire is soldered to the bearing pressure clip along the top of the bronze clip. The various wires were shortened as needed to make a clean install. The speaker wires are run in the groove between the frame halves. I loaded the GP7 sound file from ESU, and set the initial CVs using the LokProgrammer. Later, I tuned the performance with the NCE PowerCab.
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When the shell is put on, the rear light is put into position, then tilt the shell onto the front as the front light slides along the top until it stops at the clear plastic lens piece. Kind of "auto-aligns" the LEDs.
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