NixTrainz NTZ-204 - Power Bridge III, 2 Wire Stay-Alive

This one is straightforward to use and works with practically any decoder. Just connect the red wire to the plus and the black wire to minus (GND) of the decoder.

The PB3 connects to practically all DCC decoders. There is no data cable and the starting charge time can not be controlled. This is not necessary, as the supercaps are charged slower than with the PB 1 & 2 (about 10 seconds).

Use 2 capacitors as described in the directions and the picture.  The long lead on the cap is positive.  And, the white stripe is negative.

Also available with larger capacitors and JST connectors

Size w/ 2 caps: 12.7 x 6 x 2.55 mm   0.5 x 0.24 x 0.10 in
Each Supercap: 4 x 12 mm                 0.16 x 0.47 in
Total Capacitance as listed:                0.15 Farad